Battery and electrical device with the battery

Abstract

Battery characterized in that it comprises a positive electrode, wherein the positive electrode comprises a cathodic current collector and a cathodic material provided on at least one surface of the cathodic current collector, wherein the cathodic material comprises an active cathodic material, wherein the active cathodic material comprises an olivine-type phosphate and a lithium nickel cobalt manganese oxide, wherein the battery satisfies the following conditions: 0.004 ≤ a ( c / 1 .2 ) ⋅ b ≤ 0.190 , where a=a2-a1 holds, where a1 and a2 are the peak positions of the (131) crystal plane in the XRD spectrum of the positive electrode at 20% SOC and 80% SOC of the battery respectively in the unit degree “°”; where b is the mass fraction of the lithium nickel cobalt manganese oxide in the cathodic material, dimensionless; where c is the intensity ratio of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material, dimensionless.

Description

TECHNICAL AREA

[0001] The present invention relates to the technical field of batteries, and in particular to a battery and an electrical device containing this battery. BACKGROUND

[0002] Olivine-type phosphate contains manganese ions, resulting in a higher voltage plateau and better lithium-ion transfer performance. However, olivine-type phosphate has poor ionic conductivity and is prone to polarization during charge and discharge cycles. This can lead to significant manganese ion dissolution and consequently a degradation of the performance of olivine-type phosphate batteries, particularly at high temperatures. SUMMARY OF THE INVENTION

[0003] The aim of the present invention is to overcome the shortcomings of the above-mentioned prior art by providing a battery and an electrical device containing the battery to reduce the dissolution of Mn in olivine-type phosphate, so that the battery has good performance at high temperatures, such as high-temperature energy storage performance and high-temperature cycle performance.

[0004] To achieve the above-mentioned objective, the first aspect of the present invention provides a battery comprising a positive electrode, wherein the positive electrode comprises a cathodic current collector and a cathodic material provided on at least one surface of the cathodic current collector, wherein the cathodic material comprises an active cathodic material or cathode-active material, wherein the active cathodic material comprises an olivine-type phosphate and a lithium nickel cobalt manganese oxide, wherein the battery meets the following conditions: 0.004≤a(c / 1,2)⋅b≤0.190, where a=a2-a1 holds, where a1 is a peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 20% SOC of the battery in the unit degree “°” and where a2 is a peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC of the battery in the unit degree “°”; b is the mass fraction of lithium nickel cobalt manganese oxide in the cathodic material, dimensionless; c is the intensity ratio of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material, dimensionless.

[0005] The second aspect of the present invention provides for an electrical device containing the battery.

[0006] The advantageous effects of the present invention compared to the prior art are as follows: the present invention proposes to combine the olivine-type phosphate with the ternary cathodic material and to adjust the difference (a) of the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC and 20% SOC of the battery, the mass fraction (b) of lithium nickel cobalt manganese oxide in the cathodic material, and the intensity ratio (c) of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material to satisfy a specific relationship. In this way, the polarization of the olivine-type phosphate, the lithium-ion diffusion barrier of the NCM, and the thermal stability of the NCM can be balanced, thereby improving the performance at high battery temperatures, such as... B. performance in high-temperature cycles and performance in high-temperature energy storage. DETAILED DESCRIPTION OF THE EXECUTION FORMS

[0007] To more clearly illustrate the subject matter, technical solutions, and advantages of the embodiments of the present invention, the technical solutions according to the embodiments of the present invention are described clearly and completely below. It can be assumed that the described embodiments represent a subset of the embodiments of the present invention, not all embodiments. Starting from the embodiments of the present invention, all other embodiments that a person skilled in the art can achieve without inventive work fall within the scope of protection of the present invention.

[0008] In the present invention, the technical features defined in an open limitation comprise a closed technical solution consisting of the aforementioned features, and also an open technical solution containing the aforementioned features.

[0009] When the present invention relates to a numerical interval, the above numerical interval, unless otherwise specified, is considered continuous and includes the minimum and maximum values ​​of the defined range, as well as every value between these minimum and maximum values. If a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. Furthermore, if several ranges are provided to describe features or properties, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein are to be understood as encompassing all subranges contained therein.

[0010] Within the scope of the present invention, there are no particular restrictions regarding the specific dispersion and stirring processes.

[0011] The reagents or instruments used in the present invention are, without specifying the manufacturer, all commercially available products. battery

[0012] One embodiment of the present invention provides a battery comprising a positive electrode, wherein the positive electrode comprises a cathodic current collector and a cathodic material provided on at least one surface of the cathodic current collector, wherein the cathodic material comprises an active cathodic material, wherein the active cathodic material comprises an olivine-type phosphate and a lithium nickel cobalt manganese oxide (NCM), wherein the battery meets the following conditions: 0.004≤a(c / 1,2)⋅b≤0.190, where a=a2-a1 holds, where a1, a2 are the peak positions of the (131) crystal plane in the XRD spectrum of the positive electrode at 20% SOC and 80% SOC of the battery respectively in the unit degree “°”; b is the mass fraction of lithium nickel cobalt manganese oxide in the cathodic material, dimensionless; c is the intensity ratio of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material, dimensionless.

[0013] The addition of NCM to olivine-type phosphate utilizes its high ionic conductivity to improve the overall ion migration rate of the material. This results in a more uniform lithium deintercalation from the olivine-type phosphate at each voltage plateau. Furthermore, it can improve the uniformity of lithium deintercalation in the olivine-type phosphate, reduce the stress on the olivine-type phosphate during lithium deintercalation, prevent polarization of the olivine-type phosphate, and reduce the risk of manganese dissolution in the olivine-type phosphate. This contributes to improved battery performance at high temperatures, such as high-temperature energy storage performance and high-temperature cycle performance.Furthermore, the NCM has good structural stability under the influence of the Mn it contains, which ensures that it can exert a stable inhibitory effect on the polarization of olivine-type phosphate during charge and discharge cycles.

[0014] The diffraction peak of the (131) crystal plane is a characteristic peak of the olivine-type phosphate, and the peak position represents the interplanar distance. The inventors of the present invention have found that when the olivine-type phosphate undergoes structural instability, the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode changes at different battery state (SOC) levels, particularly when the battery is at 80% SOC and 20% SOC. The difference (a) in the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC and 20% SOC of the battery can reflect the structural stability of the olivine-type phosphate. The smaller the value of the difference in peak position (a), the less structural change occurs in the olivine-type phosphate during charging and discharging, and the better the structural stability.However, if the structural stability of the olivine-type phosphate is too high, the crystallinity is high, which is not conducive to the performance of the capacitor.

[0015] The value of the difference (a) of the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC and 20% SOC of the battery can be controlled by adjusting the type of carbon source in the olivine-type phosphate carbon coating material, the calcination temperature, the temperature holding time and the heating rate during the carbon coating process, as well as the type of doping elements in the olivine-type phosphate.

[0016] The present invention does not restrict the method for detecting the difference (a) in the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC and 20% SOC of the battery. A person skilled in the art can determine the difference (a) in the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC and 20% SOC of the battery using conventional technical means. For example, the difference (a) in the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC and 20% SOC of the battery can be determined using the method described below:

[0017] The battery is discharged to 2.5 V at 0.33 C and then charged to 4.25 V at 0.33 C. The discharge capacity is recorded as C1. The charge is adjusted to 0.2 times the state C1 by charging at 0.33 C and recorded as 20% SOC. The positive electrode is obtained by decomposition in an inert atmosphere, and the resulting positive electrode is subjected to an XRD test to record the peak angle corresponding to the (131) crystal plane, i.e., a1;

[0018] The battery is discharged to 2.5 V at 0.33 C and then charged to 4.25 V at 0.33 C. The discharged capacity is recorded as C1. The charge is adjusted to 0.8 times the state C1 by charging at 0.33 C and recorded as 80% SOC. The positive electrode is obtained by disintegration in an inert atmosphere, and the obtained positive electrode is subjected to an XRD test to record the peak angle corresponding to the (131) crystal plane, i.e., a2. Then the difference (a) of the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC and 20% SOC of the battery is calculated; The specific test conditions of the XRD test are as follows: Cu target, scanner voltage of 40 kV, current of 40 mA, scan range of 5-80°, scan speed of 5° / min, XRD calibration with internal silicon standard, and the XRD device used is the Ultima IV from Rigaku; In the XRD spectrum, the diffraction peak at the point where the diffraction angle is 20 35.5±0.5° is the diffraction peak of the (131) crystal plane.

[0019] The mass fraction (b) of lithium nickel cobalt manganese oxide in the cathodic material indicates the amount of NCM added to the cathodic material. The larger the value, the more NCM has been added. If the amount of NCM added to the cathodic material is too small, the inhibitory effect of the NCM on the polarization of the olivine-type phosphate is not apparent. If the amount of NCM added to the cathodic material is too large, the thermal stability of the entire material system decreases, which is detrimental to performance at high temperatures.

[0020] The value of the mass fraction (b) of the lithium nickel cobalt manganese oxide in the cathodic material can be controlled by adjusting the mass ratio of the olivine-type phosphate to the NCM, the proportion of the active cathodic material in the cathodic material, etc.

[0021] The present invention does not restrict the method for detecting the mass fraction (b) of lithium nickel cobalt manganese oxide in the cathodic material. A person skilled in the art can determine the mass fraction (b) of lithium nickel cobalt manganese oxide in the cathodic material using conventional technical means. For example, the mass fraction (b) of lithium nickel cobalt manganese oxide in the cathodic material can be measured using an inductively coupled plasma (ICP) detection method. The battery is discharged at 0.33 C to 2.5 V, and the positive electrode is recovered by disassembly. It is then soaked in dimethyl carbonate (DMC), dried, and the cathodic material on the positive electrode is scraped for energy dispersion spectrometry (EDS) analysis. The material morphology and size are observed at 15k magnification, and the element types and their concentrations (normalized percent atomic content) of particles of varying sizes in the field of view are examined by EDS point-scan signal acquisition. Similar particles are selected at a minimum of three locations for testing to obtain accurate parallel sample results. Based on the data, the material type is identified, and the average molar ratio of each transition metal element to the total transition metal elements is determined, representing the chemical composition of each component of the main cathodic material in the electrode.The sample is then subjected to an ICP test (precise weighing of 0.5 g of the scraped cathodic material powder, dispersion in 20 ml of water, subsequent addition of 10 ml of nitric acid (66% HNO3 by mass), dispersion and heating until the cathodic material powder is completely dissolved, and dilution with water to 100 ml to obtain the test solution. The test solution is subjected to an ICP test, and the operating conditions of the ICP instrument are set as follows: gas flow rate 0.5 L / min, power 1150 W, and the ICP test is performed) to confirm the concentration of the corresponding chemical composition elements of the active cathodic material (i.e., the specific molar ratio of the chemical elements). The molar ratio of the individual transition metals to the total metal in the electrode is confirmed.In conjunction with the actual metal molar ratio of each material, confirmed by the aforementioned EDS, the mass ratio of the cathodic material containing a specific metal element to the total material is calculated as θ = ICP molar ratio / EDS molar ratio. The mass ratio of the remaining other material types is 1 - θ. The mass ratio of the two active cathodic materials is determined based on their chemical composition, and the mass fraction of the individual elements in the olivine-type phosphate and the lithium-nickel-cobalt-manganese oxide is also confirmed using the methods described above.

[0022] The intensity ratio (c) of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material represents the degree of disorder of the NCM crystal structure. If the value is too high, this means that the degree of disorder of the NCM crystal structure is too great, leading to a deterioration of the cycle performance and thermal stability of the NCM material; if the value is too low, this means that the NCM crystal structure is too ordered, thereby increasing the diffusion barrier for lithium ions and impairing the internal resistance of the material.

[0023] The value of the intensity ratio (c) of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material can be controlled by adjusting the manganese content in the lithium nickel cobalt manganese oxide, the parameters of the preparation or manufacturing process of the lithium nickel cobalt manganese oxide material (such as calcination temperature, temperature holding time, heating rate) and the particle size of the lithium nickel cobalt manganese oxide.

[0024] The present invention does not limit the method for determining the intensity ratio (c) of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material. A person skilled in the art can determine the intensity ratio (c) of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material using conventional technical means. For example, the intensity ratio (c) of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material can be determined according to the method described below: The battery is discharged at 0.33 C to 2.5 V, and the positive electrode is recovered by disassembly. The positive electrode is soaked in DMC for 60 minutes at room temperature, removed, dried, and the cathodic material is scraped from the surface of the current collector. The recovered cathodic material is examined by XRD, and the intensities of the diffraction peaks corresponding to the (003) and (104) crystal planes are recorded, i.e., I(003) and I(104). Then, the intensity ratio of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material is calculated (c). The specific test conditions of the XRD test are as follows: Cu target, scanner voltage of 40 kV, current of 40 mA, scan range of 5-80°, scan speed of 2° / min, XRD calibration with internal silicon standard, and the XRD device used is the Ultima IV from Rigaku; In the XRD spectrum, the diffraction peak at the point where the diffraction angle 2θ is 18.5 ± 0.3° is the diffraction peak of the (003) crystal plane, and the diffraction peak at the point where the diffraction angle 20 is 44.5 ± 0.3° is the diffraction peak of the (104) crystal plane.

[0025] In the XRD spectrum of the positive electrode at 80% SOC and 20% SOC, the difference (a) in the peak position of the (131) crystal plane, the mass fraction (b) of the lithium nickel cobalt manganese oxide in the cathodic material, and the intensity ratio (c) of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material affect the high-temperature performance of the battery to varying degrees, e.g., high-temperature cycling performance and high-temperature energy storage performance. Therefore, it is difficult to achieve good high-temperature battery performance, such as good high-temperature energy storage and high-temperature cycling performance, by controlling a single variable.The present invention achieves a balance between the polarization and capacity of the olivine-type phosphate, the lithium-ion diffusion barrier of the NCM, and the thermal stability of the NCM by mixing the olivine-type phosphate with the NCM and adjusting the difference (a) of the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode of the battery at 80% SOC and 20% SOC, the mass fraction (b) of the lithium nickel cobalt manganese oxide in the cathodic material, and the intensity ratio (c) of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material to satisfy the above-mentioned specific relationship in order to achieve better high-temperature battery performance, such as high-temperature cycle performance and high-temperature energy storage performance.The above relationship includes the (c / 1,2)th power of “a”, and this power relationship indicates that there is a nonlinear coupling relationship between “a” and “c”, which reflects the regulatory effect of the NCM crystal structure properties on the change in the lattice parameter of the olivine-type phosphate and further illustrates the comprehensive influence of the interaction between the crystal structure properties and the lattice parameter change on the high-temperature performance of the battery.

[0026] For example, the value of a (c / 1,2) ·b may be chosen as follows: 0.004, 0.006, 0.008, 0.010, 0.015, 0.020, 0.025, 0.030, 0.035, 0.040, 0.045, 0.050, 0.055, 0.060, 0.065, 0.070, 0.075, 0.080, 0.085, 0.090, 0.095, 0.100, 0.110, 0.120, 0.130, 0.140, 0.150, 0.160, 0.170, 0.180, 0.190 or the interval range formed by any two of the above values.

[0027] In a preferred embodiment, the battery satisfies the following condition: 0.008≤a (c / 1.2) ·b≤0.036. The value of a (c / 1,2) ·b is controlled within this specific range to better balance the polarization and capacity of the olivine-type phosphate, the lithium-ion diffusion barrier of the NCM, and the thermal stability of the NCM, further improving performance in high-temperature energy storage.

[0028] In some embodiments, the difference (a) of the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC and 20% SOC of the battery is in the range of 0.05° to 0.20°, such as 0.05°, 0.07°, 0.10°, 0.12°, 0.15°, 0.18°, 0.20° or the interval range formed by any two of the above values.

[0029] In a preferred embodiment, the difference (a) of the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC and 20% SOC of the battery is in the range of 0.10° to 0.15°.

[0030] If the difference (a) of the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC and 20% SOC of the battery is in the range of 0.05° to 0.20°, particularly in the range of 0.10° to 0.15°, the stability of the olivine-type phosphate is more suitable, and the high-temperature energy storage performance and the cycle performance of the battery are better.

[0031] In some embodiments, the mass fraction (b) of the lithium nickel cobalt manganese oxide in the cathodic material is in the range of 0.01 to 0.5, such as 0.01, 0.03, 0.05, 0.07, 0.09, 0.10, 0.20, 0.30, 0.40, 0.50 or the interval range formed by any two of the above values.

[0032] In a preferred embodiment, the mass fraction (b) of the lithium nickel cobalt manganese oxide in the cathodic material is in the range of 0.05-0.20.

[0033] If the mass fraction (b) of the lithium nickel cobalt manganese oxide in the cathodic material is in the range of 0.01 to 0.50, particularly in the range of 0.05 to 0.20, it is more advantageous to balance the polarization of the olivine-type phosphate and the thermal stability of the cathodic material, so that the performance in high-temperature energy storage is better.

[0034] In some embodiments, the intensity ratio (c) of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material is in the range of 0.5-1.8, such as 0.5, 0.7, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8 or the interval range formed by any two of the above values.

[0035] In a preferred embodiment, the intensity ratio (c) of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material is in the range of 1.0 to 1.5.

[0036] If the intensity ratio (c) of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material is in the range of 0.5 to 1.8, especially in the range of 1.0 to 1.5, the perturbation level of the NCM is better suited, the cycle and thermal stability are good, the diffusion barrier for lithium ions is lower, and the high-temperature battery performance, such as high-temperature cycle performance and high-temperature energy storage performance, is better.

[0037] In some embodiments, the range of a1 is 35.0 to 35.9, for example 35.0, 35.1, 35.2, 35.3, 35.4, 35.5, 35.6, 35.7, 35.8, 35.9, or the interval formed by any two of the above values. The value of a1 reflects the Mn content in the olivine-type phosphate. Controlling the value of a1 within the above-mentioned suitable range is not only advantageous for improving the energy density of the battery but also makes the Mn in the manganese-iron-lithium structure more stable.

[0038] In some embodiments, the range of a2 is 35.2 to 36.0, such as 35.2, 35.3, 35.4, 35.5, 35.6, 35.7, 35.8, 35.9, 36.0, or the interval range formed by any two of the above values, in order to reduce the risk of Mn dissolution in olivine-type phosphate.

[0039] In some embodiments, the structural formula of lithium nickel cobalt manganese oxide is: LiNi xWhat y Mn z M( 1-x-y-z)O2, where 0 <x<1, 0<y<1, 0<z<1, 0≤1-x-y-z<1, und der Bereich von x / y beträgt 4,5 bis 7; M ein Dotierungselement ist, das aus mindestens einem von Al, W, Mg, Sr und Zr ausgewählt ist. In der allgemeinen Strukturformel kann x ausgewählt werden aus 0,55, 0,60, 0,65, 0,70, 0,75, 0,80, 0,85, 0,87 oder dem Intervallbereich, der durch zwei beliebige der obigen Werte gebildet wird; y kann ausgewählt werden aus 0,03, 0,04, 0,05, 0,06, 0,07, 0,08, 0,09, 0,10, 0,12, 0,14, 0,15 oder dem Intervallbereich, der durch zwei beliebige der obigen Werte gebildet wird, ausgewählt werden; z kann aus 0,10, 0,15, 0,20, 0,25, 0,30, 0,35, 0,40 oder dem Intervallbereich, der durch zwei beliebige der obigen Werte gebildet wird, ausgewählt werden. In einer Ausführungsform beträgt der Bereich von x / y 4,5 bis 7, wie z.B.4.5, 5, 5.5, 6, 6.5, 7 or the interval range formed by any two of the above values, which not only allows the lithium nickel cobalt manganese oxide to maintain a good layered structure, but also reduces the degree of disorder of the lithium nickel cobalt manganese oxide.

[0040] The lithium nickel cobalt manganese oxide may be free of any coating material or may be coated with a coating material on part or all of its surface. The present invention does not restrict the type of coating material in the lithium nickel cobalt manganese oxide. For example, the coating material may contain at least one element selected from the following: aluminum (Al), titanium (Ti), tungsten (W), boron (B), phosphorus (P), cobalt (Co), yttrium (Y), silicon (Si); at the same time, the present invention does not restrict the content of the coating material in the lithium nickel cobalt manganese oxide. For example, the content of the coating material in lithium nickel cobalt manganese oxide is 500-5000 ppm, such as 500 ppm, 1000 ppm, 1500 ppm, 2000 ppm, 2500 ppm, 3000 ppm, 4000 ppm, 4500 ppm, 5000 ppm or the interval range formed by any two of the above values.

[0041] In some embodiments, the particle size Dv50 of the lithium nickel cobalt manganese oxide is 2.5-4.5 µm, e.g. 2.5 µm, 3.0 µm, 3.5 µm, 4.0 µm, 4.5 µm or an interval range formed by any two of the above values.

[0042] The present invention does not restrict the method for determining the particle size Dv50 of lithium nickel cobalt manganese oxide. A person skilled in the art can determine the particle size Dv50 of the lithium nickel cobalt manganese oxide using conventional technical means. The method for determining the particle size Dv50 of the lithium nickel cobalt manganese oxide is, for example, as follows: Take the empty battery, remove the positive electrode by disassembly, dry the positive electrode, collect 0.1-0.2 g of cathodic material powder with a scraper, photograph the obtained cathodic material powder with a scanning electron microscope (SEM), measure the size of the lithium nickel cobalt manganese oxide in the cathodic material powder in the SEM image using MEARSURE NANO software, determine the particle size of the lithium nickel cobalt manganese oxide by drawing diagonal lines, and after the sample size reaches more than 100, the particle size distribution is statistically analyzed to calculate the parameters of lithium nickel cobalt manganese oxide associated with the particle size: Dv50.

[0043] Within the scope of the present invention, the process for producing the lithium nickel cobalt manganese oxide is not limited, and a person skilled in the art can produce the lithium nickel cobalt manganese oxide using conventional technical means. The process for producing the lithium nickel cobalt manganese oxide comprises, for example, the following steps: The precursor of the lithium nickel cobalt manganese oxide and the lithium source are mixed and then sintered to obtain the lithium nickel cobalt manganese oxide.

[0044] The precursor of lithium nickel cobalt manganese oxide contains Ni, Co, and Mn in a stoichiometric target ratio (i.e., the ratio between the three elements in the precursor of lithium nickel cobalt manganese oxide is the same as the ratio between the three elements in the obtained lithium nickel cobalt manganese oxide, and other similar expressions are the same), and the precursor of lithium nickel cobalt manganese oxide is one or more of the oxides, hydroxides, and carbonates of Ni, Co, and Mn; for example, the precursor of lithium nickel cobalt manganese oxide is the hydroxide of Ni, Co, and Mn.

[0045] The precursor of lithium nickel cobalt manganese oxide can be obtained by established industrial processes, such as coprecipitation, gelation, or solid-state processes. The process for producing the lithium nickel cobalt manganese oxide precursor includes, for example, the following steps: Dispersing Ni source, Co source and Mn source in a solvent to obtain a mixed solution; Simultaneous pumping of the obtained mixed solution, the strong alkali solution, and the complexing agent solution into a stirred reactor, adjusting the pH of the reaction solution to 10-13 and the temperature in the reactor to 25-90°C, and introducing an inert atmosphere gas (such as nitrogen, or at least one of the inert gases) for protection during the reaction; after completion of the reaction, aging, filtering, washing, and vacuum drying are carried out to obtain a Ni, Co, and Mn-containing hydroxide, i.e., a precursor of lithium nickel cobalt manganese oxide.

[0046] In the production of the precursor of lithium nickel cobalt manganese oxide, at least one of the following elements is used as a Ni source: nickel sulfate, nickel nitrate, nickel chloride, nickel oxalate and nickel acetate; and / or the co-source used includes, but is not limited to, at least one of the following elements: cobalt sulfate, cobalt nitrate, cobalt chloride, cobalt oxalate and cobalt acetate; and / or the Mn source used includes, but is not limited to, at least one of manganese sulfate, manganese nitrate, manganese chloride, manganese oxalate and manganese acetate; and / or the alkali in the strongly alkaline solution used includes, but is not limited to, at least one of sodium hydroxide and potassium hydroxide; and / or that the complexing agent solution used includes, but is not limited to, ammonia water.

[0047] In the production of the precursor of lithium nickel cobalt manganese oxide, the amounts of the Ni, Co and Mn sources used can be chosen to meet the requirements: Molar amount of element Ni: Molar amount of Co element: Molar amount of Mn element = (0.55 to 0.95): (0.03 to 0.15): (0.1 to 0.4).

[0048] In the process for producing lithium nickel cobalt manganese oxide, the Li source used includes at least one of the following elements: lithium oxide (Li2O), lithium phosphate (Li3PO4), lithium dihydrogen phosphate (LiH2PO4), lithium acetate (CH3COOLi), lithium hydroxide (LiOH), lithium carbonate (Li2CO3) and lithium nitrate (LiNO3), but is not limited to them.

[0049] In the production of lithium nickel cobalt manganese oxide, the ratio of the lithium source used to the ternary material precursor used must meet the following condition: Li element molar quantity: sum of the Ni, Co and Mn element molar quantities = (1 to 1.05):1.

[0050] A ball mill or a high-speed mixer can be used to mix the precursor of the lithium nickel cobalt manganese oxide and the lithium source.

[0051] In the production of lithium nickel cobalt manganese oxide using the precursor of lithium nickel cobalt manganese oxide, the sintering atmosphere is an inert atmosphere, such as a nitrogen atmosphere, a helium atmosphere, or an argon atmosphere.

[0052] When producing lithium nickel cobalt manganese oxide using a precursor of lithium nickel cobalt manganese oxide, the sintering temperature can be chosen to be between 700 and 1000 °C and the sintering time between 6 and 9 hours.

[0053] Additionally, in the preparation of the lithium nickel cobalt manganese oxide precursor, a specific amount of a dopant source (if available) can be dispersed in a solvent along with the Ni source, the Co source, and the Mn source as needed to produce the lithium nickel cobalt manganese oxide precursor, wherein the dopant source is selected from at least one Al source, one W source, one Mg source, one Sr source, one Zr source, etc., to obtain the lithium nickel cobalt manganese oxide containing a specific amount of dopant elements.

[0054] In the production of lithium nickel cobalt manganese oxide, the lithium nickel cobalt manganese oxide can also be coated if required. Specifically, the coating material is applied to the surface of the lithium nickel cobalt manganese oxide by dry coating (high-temperature solid-state process), and the surface of the lithium nickel cobalt manganese oxide is partially or completely covered with a coating layer formed by the coating material. The coating layer comprises, for example, at least one element selected from the following (hereinafter referred to as the "coating element"): aluminum (Al), phosphorus (P), silicon (Si), titanium (Ti), tungsten (W), boron (B), cobalt (Co), or yttrium (Y).

[0055] In some embodiments, the olivine-type phosphate comprises at least one of the lithium manganese iron phosphates and the doped lithium manganese iron phosphate.

[0056] In some embodiments, the molar fraction of the manganese element in the olivine-type phosphate constitutes 60% to 85% of the total transition metal elements, for example 60%, 65%, 70%, 75%, 80%, 85%, or the interval range formed by any two of the above values.

[0057] In some embodiments, the average primary particle size of the olivine-type phosphate is in the range of 80 to 200 nm, for example 80 nm, 100 nm, 120 nm, 140 nm, 160 nm, 180 nm, 200 nm or the interval range formed by any two of the above values.

[0058] It should be noted that the average primary particle size of the olivine-type phosphate in the active cathodic material described in the present application can be confirmed by the following procedure: The battery is disassembled to obtain the positive electrode, which is then soaked in dimethyl carbonate (DMC), dried, and the cathodic material is scraped off the positive electrode for EDS energy spectrum testing. A spot scanning technique is used under a magnified viewing angle to identify the olivine-type phosphate and the layered lithium nickel cobalt manganese oxide particles. Three areas of the olivine-type phosphate are selected under a scanning electron microscope at a magnification of 30k to obtain the particle morphology. The diagonal length of the primary olivine-type phosphate particles is measured using Nanomeasurer software.A total of 80 samples are tested and the results of the three areas are counted, which corresponds to the average primary particle size of the olivine-type phosphate.

[0059] In some embodiments, the chemical formula of lithium manganese iron phosphate is LiMndFe 1-dPO4, where 0 <d<1 ist. Der Wert „d“ kann als 0,5, 0,6, 0,7, 0,8, 0,9, 0,95, 0,99 oder ein Intervallbereich ausgewählt werden, der durch zwei beliebige der oben genannten Werte gebildet wird. Das Lithium-Mangan-Eisenphosphat kann keine Dotierungselemente enthalten oder Dotierungselemente enthalten. Die vorliegende Erfindung beschränkt nicht die Arten von Dotierungselementen im Lithium-Mangan-Eisenphosphat. Beispielsweise umfassen die Dotierungselemente mindestens eines von V, W, Ti und Mg, sind jedoch nicht darauf beschränkt. Darüber hinaus beschränkt die vorliegende Erfindung nicht den Gehalt an Dotierungselementen im Lithium-Mangan-Eisenphosphat. Beispielsweise beträgt der Gehalt an Dotierungselementen im Lithium-Mangan-Eisenphosphat 500 bis 2000 ppm. Das Lithium-Mangan-Eisenphosphat kann kein Beschichtungsmaterial enthalten oder auf einem Teil oder der gesamten Oberfläche mit einem Beschichtungsmaterial beschichtet sein.The present invention does not restrict the type of coating material in the lithium manganese iron phosphate; for example, the coating material comprises at least one of graphene and carbon nanotubes. Furthermore, the present invention does not restrict the content of the coating material in the lithium manganese iron phosphate. For example, the content of the coating material in the lithium manganese iron phosphate is 1.5 to 2.5 wt.%, for example 1.5 wt.%, 1.8 wt.%, 2 wt.%, 2.2 wt.%, 2.5 wt.%, or the interval range formed by any two of the above values.

[0060] In the present invention, the process for producing the olivine-type phosphate is not limited, and a person skilled in the art can produce the olivine-type phosphate using conventional technical means. For example, the process for producing the olivine-type phosphate comprises the following steps: Mixing a manganese source, an iron source, a phosphorus source, a lithium source and a solvent and reacting at 140 to 160 °C for 8 to 12 hours to obtain an olivine-type phosphate precursor; Dispersing the obtained olivine-type phosphate precursor and a carbon source in a solvent, and spray drying and calcining the resulting mixed solution under a protective atmosphere to obtain the olivine-type phosphate.

[0061] For example, the manganese source used in the production of olivine-type phosphate includes, but is not limited to, at least one of the following: manganese tetraoxide, manganese nitrate, manganese carbonate, manganese oxalate, manganese sulfate, manganese chloride and manganese acetate.

[0062] For example, the iron source used includes at least one of the following compounds, but is not limited to them: ferrous sulfate, ferrous phosphate, ferrous hydroxide, ferrous hydroxide, ferrous carbonate, ferrous acetate, ferrous trioxide, ferrous tetraoxide, ferrous oxalate and ferrous oxalate.

[0063] For example, the phosphorus source used includes at least one of the following compounds, but is not limited to them: phosphoric acid, lithium dihydrogen phosphate, lithium phosphate, diammonium hydrogen phosphate and ammonium phosphate.

[0064] For example, the lithium source used includes, but is not limited to, at least one of lithium hydroxide, lithium dihydrogen phosphate, lithium phosphate, lithium carbonate, lithium nitrate, lithium oxalate, lithium citrate and lithium acetate.

[0065] For example, the solvent used includes water.

[0066] For example, the carbon source used includes at least one of the following compounds: glucose (GLC), sucrose, polyethylene glycol (PEG), and polyvinyl alcohol. For example, in the process for the preparation of the lithium manganese iron phosphate precursor, the molar ratio of the manganese source, iron source, and phosphorus source used is (0.6 to 0.85): (0.15 to 0.4): (1.02 to 1.05).

[0067] For example, the protective atmosphere is an inert atmosphere, such as a nitrogen atmosphere.

[0068] For example, the calcination temperature can be selected between 550 and 680 °C, such as 550 °C, 600 °C, 650 °C, 680 °C, or the interval range formed by any two of the above values.

[0069] For example, the calcination time is 4 to 10 hours, for example 6 hours, or the interval range formed by any two of the above values.

[0070] In the production of olivine-type phosphate, raw materials for dopants can also be used. For example, if the olivine-type phosphate precursor and the carbon source are dispersed in a solvent, the raw materials for dopants can also be added and dispersed together, followed by spray drying and calcination under a protective atmosphere, yielding the olivine-type phosphate. The dopants include, but are not limited to, at least one of the following: vitrification, tungsten, titanium, and magnesium.

[0071] In some embodiments, the mass fraction of olivine-type phosphate in the cathodic material is in the range of 0.46 to 0.95, for example 0.46, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95 or the interval range formed by any two of the above values.

[0072] In some embodiments, the mass fraction of the active cathodic material in the cathodic material is 0.95 to 0.985, for example 0.950, 0.965, 0.970, 0.980, 0.985 or an interval range formed by any two of the above values.

[0073] In addition to the above-mentioned active cathodic material, the cathodic material also includes a cathodic conductive agent and a cathodic binder.

[0074] The cathodic conductive material is used to provide conductivity, and any conductive material can be used without particular restrictions as long as it has suitable electronic conductivity and does not cause any obvious adverse chemical changes in the battery. For example, the cathodic conductive material includes at least one of carbon nanotubes, carbon black, graphite, carbon fiber, activated carbon, mesoporous carbon, and fullerenes, where carbon fiber includes carbon nanofibers, etc.; carbon black includes SP (Super P, the same applies below), acetylene carbon black, ketjen carbon black, etc.

[0075] In some embodiments, the mass fraction of the cathodic conductive medium in the cathodic material is 0.01 to 0.04, for example 0.010, 0.015, 0.020, 0.025, 0.030, 0.035, 0.040 or the interval range formed by any two of the above values.

[0076] The cathodic binder is used to improve adhesion between the particles of the active cathodic material and between the active cathodic material and the cathodic current collector. Any binder can be used without particular restrictions, provided it has suitable bonding properties and does not cause any obvious adverse chemical changes in the battery. For example, cathodic binders include, among others, fluorinated polyolefin binders, and fluorinated polyolefin binders include, among others, polyvinylidene fluoride (PVDF), vinylidene fluoride copolymers, or their modified derivatives (e.g., carboxylic acid, acrylic acid, acrylonitrile, etc.).

[0077] In some embodiments, the mass fraction of the cathodic binder in the cathodic material is 0.01 to 0.04, for example 0.010, 0.015, 0.020, 0.025, 0.030, 0.035, 0.040 or the interval range formed by any two of the above values.

[0078] The cathodic material can be located on one side of the cathodic current collector or on both sides of the cathodic current collector.

[0079] The present invention is not subject to any particular limitations with regard to the cathodic current collector, as long as it is conductive and does not cause adverse chemical changes in the battery, and can be used, for example, in: aluminum, nickel, titanium, stainless steel, burnt carbon; or aluminum or stainless steel, surface-treated with one of the following materials: carbon, nickel, titanium, silver, etc.

[0080] The positive electrode of the present invention can be manufactured according to conventional methods. For example, the active cathodic material, the cathodic conductive agent, and the cathodic binder are dispersed in a solvent to obtain a positive electrode suspension, and then the positive electrode suspension is applied to at least one side of the cathodic current collector, and after drying, rolling, slotting, and other processes, a positive electrode is obtained. The solvent used to prepare the positive electrode suspension includes, but is not limited to, at least one of N-methylpyrrolidone (NMP) and deionized water. battery

[0081] The present invention also relates to a battery comprising a positive electrode, a negative electrode and an electrolyte.

[0082] The negative electrode of the present invention comprises an anodic current collector and an anodic material located on at least one surface of the anodic current collector, wherein the anodic material comprises an active anodic material or anode-active material.

[0083] The present invention is not subject to any particular limitations with respect to the active anodic material. The active anodic material comprises, for example, but is not limited to, at least one of the following: natural graphite, synthetic graphite, mesophase microcarbon beads (MCMB), hard carbon, soft carbon, silicon, SiO₂ f (0 <f<2, beispielsweise f=1), Siliziumkohlenstoff und Li4Ti5O 12 .

[0084] In some embodiments, the active anodic material comprises graphite, and the average particle diameter of the graphite is 8 to 13 µm, for example 8 µm, 9 µm, 10 µm, 11 µm, 12 µm, 13 µm or the interval range formed by any two of the above values.

[0085] The present invention does not limit the method for determining the average particle diameter of graphite, and a person skilled in the art can determine the average particle diameter of graphite using conventional technical means. The method for determining the average particle diameter of graphite is, for example, as follows: The secondary battery in its empty state is disassembled, and the resulting negative electrode is scraped off and tested in accordance with the test procedure of D50 in the national standard GB / T24533-2019.

[0086] In some embodiments, the mass fraction of the active anodic material in the anodic material is 0.93 to 0.98, for example 0.93, 0.95, 0.97, 0.98 or the interval range formed by any two of the above values.

[0087] The active anodic material layer may also contain an anodic conductive agent and / or an anodic binder.

[0088] The anodic conductive material is used to provide conductivity, and any conductive material can be used without special restrictions as long as it has suitable electronic conductivity and does not cause significant adverse chemical changes in the battery. The anodic conductive material includes, for example, but is not limited to, at least one of the following: carbon nanotubes, carbon black, graphite, carbon fiber, activated carbon, mesoporous carbon, and fullerenes, where carbon fiber is such as carbon nanofiber, etc.; carbon black is such as SP, acetylene carbon black, ketjen carbon black, etc.

[0089] In some embodiments, the mass fraction of the anodic conductive medium in the anodic material is 0.01 to 0.05, for example 0.010, 0.015, 0.020, 0.025, 0.030, 0.035, 0.040, 0.045, 0.050 or the interval range formed by any two of the above values.

[0090] The anodic binder is used to improve adhesion between the particles of the active anodic material and between the active anodic material and the anodic current collector. Any binder can be used without particular restrictions, provided it has suitable binder properties and does not cause any significant adverse chemical changes in the battery. For example, anodic binders include, but are not limited to, fluorinated polyolefin binders, and fluorinated polyolefin binders include, but are not limited to, polyvinylidene fluoride (PVDF), vinylidene fluoride copolymers, or their modified derivatives (e.g., carboxylic acid, acrylic acid, acrylonitrile, etc.).

[0091] In some embodiments, the mass fraction of the anodic binder in the anodic material is 0.01 to 0.05, for example 0.010, 0.015, 0.020, 0.025, 0.030, 0.035, 0.040, 0.045, 0.050 or the interval range formed by any two of the above values.

[0092] The anodic material can be located on one side of the anodic current collector or on both sides of the anodic current collector.

[0093] The present invention is not subject to any particular restrictions with regard to the anodic current collector, as long as it is conductive and does not cause adverse chemical changes in the battery, and can be used, for example, as: copper, stainless steel, aluminum, nickel, titanium, burnt carbon, copper or stainless steel, surface-treated with at least one of the substances carbon, nickel, titanium, silver, etc., or an aluminum-cadmium alloy.

[0094] The electrolyte of the present invention can be selected from various electrolytes suitable for batteries in technical applications. The electrolyte comprises an electrolyte and a solvent, and the electrolyte can generally comprise a lithium salt.

[0095] For example, the lithium salt comprises at least one of the following, but is not limited to them: lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiClO4), lithium hexafluoroarsenate (LiAsF6), lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium trifluoromethanesulfonate (LiTFS), lithium difluorooxalatoborate (LiDFOB), lithium dioxalatoborate (LiBOB), lithium difluorophosphate (LiPO2F2), lithium difluorobis(oxalatophosphate) (LiDFOP), and lithium tetrafluorooxalatophosphate (LiTFOP). The electrolyte concentration can be selected between 0.9 and 2.0 mol / L.

[0096] For example, the solvent comprises at least one of the following compounds, but is not limited to them: ethylene carbonate (EC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), propylene carbonate (PC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butylene carbonate (BC), fluoroethylene carbonate (FEC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), methyl butyrate (MB), ethyl butyrate (EB), 1,4-butyrolactone (GBL), cyclopentane (SF), dimethyl sulfone (MSM), methyl ethyl sulfone (EMS), and diethyl sulfone (ESE). The mass fraction of the solvent in the electrolyte can be selected between 0.55 and 0.92.

[0097] Furthermore, the electrolyte may also contain additives. For example, these additives may include those for forming a negative electrode foil, additives for forming a positive electrode foil, and additives that can improve certain battery properties, such as additives that improve battery performance at high temperatures, additives that improve battery overcharge performance, additives that improve battery performance at low temperatures, etc.

[0098] The battery may also contain a separator located between the positive and negative electrodes. This separator serves to keep the positive and negative electrodes apart, preventing a short circuit between them. The separator can be made of any insulating film material suitable for batteries in technical applications. For example, the separator may include at least one of polypropylene and one of polyethylene, but is not limited to these materials. Electrical device

[0099] The present invention further relates to an electrical device containing the battery. The battery serves as a power supply for the electrical device.

[0100] The term "electrical device" refers to any device that can utilize electrical energy and convert it into mechanical energy, heat energy, light energy, or one or more other forms of energy, such as electric motors, electric heat engines, electric light sources, etc. Specifically, it can include, but is not limited to, mobile devices, electric vehicles, electric trains, ships and satellites, energy storage systems, etc. A mobile device can be a mobile phone, a laptop computer, a drone, a robotic sweeper, an electronic cigarette, etc.; an electric vehicle can be a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.

[0101] The present invention is described in more detail below with reference to specific examples. It should be noted that the sintering is carried out in an air atmosphere unless otherwise specified. Example 1

[0102] The following example shows a lithium-ion battery whose specific manufacturing process is as follows: (1) Production of the positive electrode

[0103] Preparation of the olivine-type lithium manganese iron phosphate: MnSO4, FeSO4 and H3PO4 are mixed uniformly in a molar ratio of 6:4:10, and water is added to prepare a mixed solution with a transition metal element concentration of 1 M, and then ascorbic acid and LiOH are added, wherein the amount of ascorbic acid added is 0.2% of the total molar amount of MnSO4, FeSO4 and H3PO4, and the amount of LiOH added is three times the molar amount of H3PO4; The resulting mixture is stirred at 70 °C for 6 hours, pressurized and heated to 150 °C for 10 hours, the solid is separated and dried, and then the resulting powder is dispersed in water, a carbon source of 21 wt% of the powder mass is added, spray-dried and finally calcined at 800 °C in a nitrogen atmosphere to obtain carbon-coated lithium manganese iron phosphate;

[0104] The value of t and the selection of the carbon source are given in Table 1.

[0105] Preparation of lithium nickel cobalt manganese oxide containing lithium oxide: Nickel acetate, cobalt acetate, manganese acetate, and sodium hydroxide are mixed in a molar ratio of 6:1:3:10 and dissolved in water. The mixture is reacted at 80 °C for 24 hours, and the solid is separated. The resulting precursor, with an average particle size of 3.5 µm, is mixed with lithium hydroxide in a stoichiometric ratio and calcined for 8 hours at n °C in an air atmosphere to obtain lithium nickel cobalt manganese oxide. where the value of n is given in Table 1.

[0106] Preparation of the positive electrode: The obtained olivine-type phosphate is mixed with the NCM according to the ratio in Table 1 as the active cathodic material, and the active cathodic material is dispersed in NMP with a binder PVDF and a conductive agent SP according to a mass ratio of 97:2:1 to obtain a positive electrode suspension, and the positive electrode suspension is applied to both sides of an aluminum foil and then rolled and cut to obtain the positive electrode. (2) Production of the negative electrode

[0107] Artificial graphite with a particle size of 12 µm as the active anodic material is mixed with a conductive agent SP and a binder CMC in a mass ratio of 96.4:1:2.6, dispersed in deionized water to obtain a negative electrode suspension, which is applied to both sides of a copper foil, dried, rolled and cut to obtain the negative electrode. (3) Production of the electrolyte

[0108] Ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) are mixed in a volume ratio of 1:1:1 to obtain a mixed organic solvent, and then dried lithium salt LiPF6 is dissolved in the above-mentioned mixed organic solvent to prepare an electrolyte with a LiPF6 concentration of 1 mol / L. (4) Preparation of the separator

[0109] A polyethylene (PE) separator is used. (5) Assembly and shaping

[0110] The positive electrode, separator, and negative electrode are stacked in that order, with the separator acting as an insulator between the positive and negative electrodes, and then wound to form a bare cell. The bare cell is placed in an outer packaging sleeve, dried, and then injected with electrolyte. After vacuum packaging, curing, forming, and other processes, a lithium-ion battery is obtained. Examples 2-27 and comparative examples 1-2

[0111] These examples and comparison examples all show a lithium-ion battery, and the manufacturing process is similar to Example 1, with the following exceptions: In the production of olivine-type lithium manganese iron phosphate, the molar ratio of MnSO4, FeSO4, and H3PO4 is adjusted according to the chemical structural formula of lithium manganese iron phosphate. The chemical structural formula of lithium manganese iron phosphate, the t-value, and the selection of the carbon source are listed in Table 1. In the production of lithium nickel cobalt manganese oxide, which contains lithium oxide, the ratio of the sum of the molar amounts of nickel acetate, cobalt acetate, and manganese acetate to the molar amount of sodium hydroxide is determined, and the molar ratio of nickel acetate, cobalt acetate, and manganese acetate is adjusted according to the chemical structural formula of lithium nickel cobalt manganese oxide. The chemical structural formula of lithium nickel cobalt manganese oxide and the value n are given in Table 1. In the manufacture of the positive electrode, the mass ratio of the active cathodic material (i.e., the main cathodic material) to the binder and the conductive medium is given in Table 1.

[0112] The above procedure is used to determine the difference (a) in the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC and 20% SOC of the battery, the mass fraction (b) of the lithium nickel cobalt manganese oxide in the cathodic material, and the intensity ratio (c) of the diffraction peak (003) to the diffraction peak (104) in the XRD spectrum of the cathodic material. The test results are listed in Table 2.

[0113] The performance tests are performed on the lithium-ion batteries of the respective examples and comparison examples. The test results are listed in Table 2. The specific test method is as follows: High-temperature performance: The lithium-ion battery is stored statically at 45°C for 120 minutes and then charged and discharged according to the following procedure: Full charge with constant current and constant voltage at 1C, cut-off voltage 4.25V, cut-off current 0.33C, stored statically for 20 minutes, then discharge with constant current at 1C to 2.5V; The above charge and discharge is considered one cycle, and the cyclic charge and discharge is performed, and the discharge capacity of the first cycle at 1C is considered the initial discharge capacity of the first cycle, and the ratio of the discharge capacity at 1C to the initial 5V;The above-mentioned charging and discharging is considered as one cycle, and the cyclic charging and discharging is carried out, taking the discharge capacity of the first cycle at 1C as the initial discharge capacity of the first cycle, and taking the ratio of the discharge capacity after 100 cycles of charging and discharging at 1C to the initial discharge capacity of the first cycle as the capacity maintenance rate of the battery after 100 cycles at high temperature; Performance during energy storage at high temperature: Constant current and constant voltage full charge at 0.33 C and 25 °C, cut-off voltage 4.25 V, cut-off current 0.33 °C, static storage for 20 min, then discharge with constant current at 0.33 C to 2.5 V, the above is one cycle, repeat twice, take the capacity of the second cycle, full charge with constant current and constant voltage at 0.33 C and 25 °C, cut-off voltage 4.25 V, cut-off current 0.33 °C.The battery is placed in an incubator at 60°C for 7 days and then in an incubator at 25°C for 4 hours of static storage. It is then discharged with constant current at 0.33C and at 25°C to 2.5V, and capacity f is measured. Next, it is fully charged with constant current and constant voltage at 0.33C, with a cut-off voltage of 4.25V and a cut-off current of 0.33C. It is then statically stored for 20 minutes, followed by a discharge with constant current at 0.33C to 2.5V. Capacity e of the second cycle is measured. Finally, it is fully charged with constant current and constant voltage at 0.33C and at 225V, with a cut-off current of 0.33C. It is then statically stored for 20 minutes, followed by a discharge with constant current at 0.33C to 2.5V, and capacity g is determined. f / e is the capacity maintenance rate after storage, g / e is the capacity recovery rate after storage.

[0114] In the batteries produced according to the individual embodiments of the present invention, the capacity retention rate after 100 cycles at 1°C and 45°C is ≥ 90%, the capacity retention rate after 7 days of storage at 60°C is ≥ 83%, and the capacity recovery rate after 7 days of storage at 60°C is ≥ 80%. It is evident that the battery containing the positive electrode of the present invention exhibits excellent performance at high temperatures and in energy storage.

[0115] From the comparison between Examples 1 to 7 and Examples 8 to 13, as well as between Examples 14 to 15 and Examples 16 to 21, it is evident that when the difference (a) of the peak position of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC and 20% SOC of the battery, the mass fraction (b) of the lithium nickel cobalt manganese oxide in the cathodic material, and the intensity ratio (c) of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material satisfy the preferred range of the present invention, the performance at high temperatures and the energy storage performance of the battery are relatively better.

[0116] From the comparison between examples 1 to 7 and examples 14 to 15, as well as between examples 8 to 13 and examples 16 to 21, it can be seen that the high-temperature performance and the energy storage performance of the battery are relatively better when the battery is 0.008 ≤ a (c / 1,2) · b ≤ 0.036 is satisfied.

[0117] According to comparison examples 1 to 2, even if the difference in peak position (a) of the (131) crystal plane in the XRD spectrum of the positive electrode at 80% SOC and 20% SOC of the battery, the mass fraction (b) of the lithium nickel cobalt manganese oxide in the cathodic material, and the intensity ratio (c) of the diffraction peak (003) to the diffraction peak (104) in the XRD spectrum of the cathodic material are within the appropriate range, the value of a (c / 1,2) · If b exceeds the range of 0.004 to 0.190, the battery's performance at high temperatures and energy storage are relatively poor.

[0118] Finally, it should be noted that the embodiments described above serve only to illustrate the technical solution of this article and are not intended to limit the scope of protection provided herein. Although the present application is described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of this article may be modified or replaced by equivalents without departing from the essence and scope of the technical solution provided herein.

Claims

[1] Battery, characterized by , that it comprises a positive electrode, wherein the positive electrode comprises a cathodic current collector and a cathodic material provided on at least one surface of the cathodic current collector, wherein the cathodic material comprises an active cathodic material, wherein the active cathodic material comprises an olivine-type phosphate and a lithium nickel cobalt manganese oxide, wherein the battery satisfies the following conditions: 0.004≤a(c / 1,2)⋅b≤0.190, where a=a2-a1 holds, where a1 and a2 are the peak positions of the (131) crystal plane in the XRD spectrum of the positive electrode at 20% SOC and 80% SOC of the battery respectively in the unit degree “°”; where b is the mass fraction of the lithium nickel cobalt manganese oxide in the cathodic material, dimensionless; where c is the intensity ratio of the (003) diffraction peak to the (104) diffraction peak in the XRD spectrum of the cathodic material, dimensionless. [2] The battery according to claim 1, characterized by , that the battery fulfills: 0.008 ≤ a (c / 1,2L) · b ≤ 0.

036. [3] Battery according to claim 1, characterized by , that the range is from 0.05° to 0.20°. [4] Battery according to claim 3, characterized by , that the range is from 0.10° to 0.15°. [5] Battery according to claim 1, characterized by , that the range of b is 0.01 to 0.

50. [6] Battery according to claim 5, characterized by , that the range of b is 0.05 to 0.

20. [7] Battery according to claim 1, characterized by , that the range is from c 0.5 to 1.

8. [8] Battery according to claim 7, characterized by , that the range is from c 1.0 to 1.

5. [9] Battery according to claim 1, characterized bythat it meets at least one of the following conditions: S1. the range of a1 is 35.0 to 35.9; S2. the range of a2 is 35.2 to 36.0; S3. The structural formula of lithium nickel cobalt manganese oxide is: LiNi x Co y Mn z M( 1-x-y-z )O2, where 0 <x< 1, 0<y< 1, 0<z< 1, 0≤1-x-y-z<1, und der Bereich von x / y beträgt 4,5 bis 7; M ist ein Dotierungselement, ausgewählt aus mindestens einem der Elemente Al, W, Mg, Sr und Zr; S4. the olivine-type phosphate comprises at least one of lithium manganese iron phosphate and doped lithium manganese iron phosphate; S5. the molar content of manganese in the olivine-type phosphate is 60 to 85% of the total transition metal elements; S6. the average primary particle size of the olivine-type phosphate is in the range of 80 to 200 nm; S7. The particle size Dv50 of the lithium nickel cobalt manganese oxide is in the range of 2.5 to 4.5 µm; S8. the mass fraction of olivine-type phosphate in the cathodic material is in the range of 0.46 to 0.95; S9. wherein the battery further comprises a negative electrode comprising an active anodic material; wherein the active anodic material comprises graphite and the average particle diameter of the graphite is 8 to 13 µm. [10] Electrical appliance, characterized by that it comprises a battery according to one of claims 1-9.