An anion-cation double-doped nickel-cobalt-manganese positive electrode precursor material, a preparation method and application thereof

Abstract

The application provides a kind of anion and cation double-doped nickel cobalt manganese positive electrode precursor material and its preparation method and application.The nickel cobalt manganese positive electrode precursor material includes precursor matrix material and doping element doped in the precursor matrix material;The doping element includes phosphorus and lanthanum, and the phosphorus doping is phosphate doping.The nickel cobalt manganese positive electrode precursor material provided by the application realizes homogeneous doping of anion and cation through the synergistic doping of phosphate ions and lanthanum, effectively stabilizes lanthanum and phosphorus elements in nickel cobalt manganese, and improves the structural stability of the positive electrode material, thereby improving the electrochemical performance of the positive electrode material.

Description

Technical Field

[0001] This invention belongs to the field of lithium-ion battery technology, and relates to a nickel-cobalt-manganese cathode precursor material with both anion and cation doping, its preparation method, and its application. Background Technology

[0002] In recent years, significant progress has been made in the research and industrialization of ternary lithium-ion batteries, and the industry generally believes that NCM batteries will become the mainstream choice for future electric vehicles. Generally speaking, based on safety and cycle performance considerations, ternary lithium-ion batteries mainly use series with relatively low nickel content, such as 333, 442, and 523. However, as EVs demand increasingly higher energy density, the nickel content in ternary materials is gradually increasing.

[0003] Increasing the nickel content in ternary materials leads to higher energy density, but it's well known that higher nickel content in ternary materials results in lower stability and safety. To address this, one approach is doping. Doping the ternary material lattice with metal ions can suppress Li / Ni cation mixing, helping to reduce initial irreversible capacity. Metal ion doping can also make the layered structure more complete, thus improving rate capability and enhancing the structural stability and cycling performance of the ternary material. Doping with anions can create defect sites and form strong bonds with oxygen, reducing oxygen release during cycling and preventing structural collapse, thereby improving the material's structural stability.

[0004] For example, CN111377487A relates to a method for preparing Al and F co-doped high-nickel ternary cathode material. A metal ion salt solution A of nickel sulfate, cobalt sulfate, and manganese sulfate, a sodium hydroxide solution B as a precipitant, and an ammonia solution C as a complexing agent are used as raw materials to prepare a high-nickel ternary cathode material precursor in a nitrogen atmosphere. The high-nickel ternary cathode material precursor, lithium source, Al-containing additive, and F-containing additive are then ball-milled and mixed in a certain stoichiometric ratio, and calcined to obtain the Al and F co-doped high-nickel ternary cathode material.

[0005] CN112080800A discloses a method for modifying a single-crystal ternary cathode material. The method involves mixing a precursor containing nickel, cobalt, and manganese with a dopant metal soluble salt, adding the mixture to pure water and stirring until homogeneous, then spray-drying to obtain a pretreated precursor. The pretreated precursor is then sintered at low temperature under an oxidizing atmosphere to obtain a low-temperature sintered product. The low-temperature sintered product is then mixed homogeneously with a lithium source, and then sintered at high temperature under an oxidizing atmosphere to obtain a doped and modified single-crystal ternary cathode material.

[0006] Because doping during sintering often results in uneven doping, and sintering temperatures may be increased or additional sintering steps added to ensure doping levels and improve uniformity, this process suffers from drawbacks such as poor uniformity, high energy consumption, and numerous steps. Therefore, in recent years, researchers have increasingly focused on elemental doping on precursors to improve doping uniformity, reduce sintering steps, and enhance the electrochemical performance of cathode materials.

[0007] Improving the structural stability of cathode materials after doping and achieving uniform and phase-free doping of doped ions is an urgent technical problem to be solved. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the present invention aims to provide a nickel-cobalt-manganese cathode precursor material with both cation and anion doping, its preparation method, and its applications. The nickel-cobalt-manganese cathode precursor material provided by the present invention achieves homogeneous doping of cations and anions through the synergistic doping of phosphate ions and lanthanum, effectively stabilizing lanthanum and phosphorus elements in nickel-cobalt-manganese and improving the structural stability of the cathode material, thereby enhancing its electrochemical performance.

[0009] To achieve this objective, the present invention employs the following technical solution:

[0010] In a first aspect, the present invention provides a nickel-cobalt-manganese cathode precursor material doped with both cations and anions, the nickel-cobalt-manganese cathode precursor material comprising a precursor matrix material and doping elements doped in the precursor matrix material; the doping elements comprising phosphorus and lanthanum, wherein the phosphorus doping is phosphate doping.

[0011] The nickel-cobalt-manganese cathode precursor material provided by this invention, through the synergistic doping of phosphate ions and lanthanum, forms uniformly dispersed micro-grains in the substrate material by complexing phosphate ions with nickel-cobalt-manganese and lanthanum, thereby stabilizing the structure of the precursor material, improving the density of the material, achieving homogeneous doping of anions and cations, effectively stabilizing lanthanum and phosphorus elements in nickel-cobalt-manganese, and improving the structural stability of the cathode material, thereby enhancing the electrochemical performance of the cathode material.

[0012] In this invention, phosphate ions and lanthanum ions work together to influence each other. Lanthanum doping can widen the interlayer spacing of the material, effectively increasing the transport efficiency of Li ions in the cathode material and improving the rate performance of the material. Meanwhile, phosphorus can effectively combine with O to form strong PO bonds, preventing the release of oxygen during cycling and improving the cycling stability of the material.

[0013] Preferably, the precursor matrix material includes a nickel-cobalt-manganese hydroxide precursor matrix material.

[0014] In a second aspect, the present invention provides a method for preparing a nickel-cobalt-manganese cathode precursor material with both cation and anion doping as described in the first aspect, the method comprising the following steps:

[0015] A mixed salt solution of nickel, cobalt, manganese, and lanthanum, a phosphate doping source solution, a precipitant solution, and a complexing agent solution were added in parallel to carry out a co-precipitation reaction to obtain the anion-cation dual-doped nickel, cobalt, and manganese cathode precursor material.

[0016] The preparation method provided by this invention uses lanthanum and nickel-cobalt-manganese as co-feeds, while the phosphate dopant source is fed separately. This achieves uniform doping of phosphate and lanthanum, reduces redundant steps, and effectively stabilizes the content of lanthanum and phosphorus in nickel-cobalt-manganese. It can use the existing mature co-precipitation process, reducing process modification and lowering costs.

[0017] In this invention, if lanthanum is fed alone, it is not conducive to controlling the content of lanthanum in the precursor, which increases the difficulty of control.

[0018] Preferably, the total molar concentration of metal ions in the nickel-cobalt-manganese-lanthanum mixed salt solution is 1.5 to 2 mol / L, for example, 1.5 mol / L, 1.6 mol / L, 1.7 mol / L, 1.8 mol / L, 1.9 mol / L or 2 mol / L.

[0019] Preferably, the molar concentration of lanthanum in the nickel-cobalt-manganese-lanthanum mixed salt solution is 1 to 6 mmol / L, such as 1 mmol / L, 1.5 mmol / L, 2 mmol / L, 2.5 mmol / L, 3 mmol / L, 3.5 mmol / L, 4 mmol / L, 4.5 mmol / L, 5 mmol / L, 5.5 mmol / L, or 6 mmol / L.

[0020] Preferably, the molar concentration of phosphorus in the phosphate doping source solution is 0.03–0.17 mol / L, for example, 0.03 mol / L, 0.05 mol / L, 0.08 mol / L, 0.1 mol / L, 0.11 mol / L, 0.12 mol / L, 0.13 mol / L, 0.14 mol / L, 0.15 mol / L, 0.16 mol / L, or 0.17 mol / L.

[0021] In this invention, by controlling the molar concentration of lanthanum in the mixed salt and the molar concentration of phosphorus in the dopant source, multiple parameters can be coordinated to better stabilize the material structure, widen the interlayer spacing, and improve the rate performance and cycle stability of the material. If the molar concentration of lanthanum is too low, the rate performance of the material cannot reach the optimal level; if it is too high, lanthanum cannot provide capacity, which will lead to a decrease in the electrical performance of the material structure. If the molar concentration of phosphorus is too low, it cannot stabilize the material structure; if it is too high, the two-dimensional transport channels of phosphate will reduce the transport efficiency of Li ions, thereby reducing the electrical performance of the material.

[0022] Preferably, the phosphate doping source includes any one or a combination of at least two of disodium hydrogen phosphate, sodium dihydrogen phosphate, sodium phosphate, sodium pyrophosphate, diammonium hydrogen phosphate, or ammonium dihydrogen phosphate.

[0023] Preferably, the precipitant comprises sodium hydroxide and / or potassium hydroxide.

[0024] Preferably, the complexing agent comprises ammonia.

[0025] Preferably, the temperature of the coprecipitation reaction is 50-60°C, for example, 50°C, 51°C, 52°C, 53°C, 54°C, 55°C, 56°C, 57°C, 58°C, 59°C, or 60°C.

[0026] Preferably, the stirring rate of the coprecipitation reaction is 180 to 350 rpm, such as 180 rpm, 200 rpm, 230 rpm, 250 rpm, 280 rpm, 300 rpm, 330 rpm, or 350 rpm.

[0027] Preferably, the pH value of the coprecipitation reaction is 9.5 to 12, such as 9.5, 9.8, 10, 10.3, 10.5, 10.8, 11, 11.3, 11.5, 11.8 or 12.

[0028] In the co-precipitation process, this invention achieves a homogeneous distribution of phosphate and lanthanum in nickel-cobalt-manganese precursor materials through the synergistic cooperation of multiple parameters.

[0029] In this invention, the feed flow rate of each raw material during the coprecipitation reaction can be adaptively adjusted according to actual production needs.

[0030] Preferably, after the coprecipitation reaction, the mixture is sequentially filtered, washed, and dried.

[0031] As a preferred technical solution, the preparation method includes the following steps:

[0032] A mixed salt solution of nickel, cobalt, manganese, and lanthanum, a phosphate doping source solution with a phosphorus element molar concentration of 0.03–0.17 mol / L, a precipitant solution, and a complexing agent solution were added in parallel. The pH was maintained at 9.5–12, and a co-precipitation reaction was carried out at 50–60°C with a stirring rate of 180–350 rpm. The mixture was then filtered, washed, and dried to obtain the anion and cation doped nickel, cobalt, and manganese cathode precursor material.

[0033] The total molar concentration of metal ions in the nickel-cobalt-manganese-lanthanum mixed salt solution is 1.5–2 mol / L; the molar concentration of lanthanum in the nickel-cobalt-manganese-lanthanum mixed salt solution is 1–6 mmol / L.

[0034] Thirdly, the present invention provides a cathode material, which is obtained by mixing and sintering a lithium source with a nickel-cobalt-manganese cathode precursor material doped with both anions and cations as described in the first aspect.

[0035] The cathode material provided by this invention, after sintering, transforms the doped phosphate ions into phosphide dopants, which synergistically enhance the structural stability with lanthanum, thereby improving the electrochemical performance of the cathode material.

[0036] Fourthly, the present invention also provides a lithium-ion battery, the lithium-ion battery comprising the positive electrode material as described in the third aspect.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The nickel-cobalt-manganese cathode precursor material provided by this invention, through the synergistic doping of phosphate ions and lanthanum, forms uniformly dispersed micro-grains in the substrate material by complexing phosphate ions with nickel, cobalt, manganese, and lanthanum. This stabilizes the precursor material's structure, increases its density, and achieves homogeneous doping of anions and cations. It effectively stabilizes lanthanum and phosphorus elements in nickel, cobalt, and manganese, and improves the structural stability of the cathode material, thereby enhancing its electrochemical performance. Furthermore, during the preparation process, lanthanum and nickel, cobalt, and manganese are fed together, while the phosphate dopant source is fed separately, achieving uniform doping of phosphate and lanthanum, reducing redundant steps, and effectively stabilizing the lanthanum and phosphorus content in nickel, cobalt, and manganese. Existing mature co-precipitation processes can be used, reducing process modifications and lowering costs. Attached Figure Description

[0039] Figure 1 The image shows a SEM image of the cathode precursor material provided in Example 1.

[0040] Figure 2 The distribution diagram of lanthanum in the cathode precursor material provided in Example 1.

[0041] Figure 3 The distribution diagram of phosphorus in the cathode precursor material provided in Example 1.

[0042] Figure 4 The image shows a SEM image of the cathode precursor material provided in Example 2.

[0043] Figure 5 The image shows a SEM image of the cathode precursor material provided in Example 3.

[0044] Figure 6 The distribution diagram of lanthanum in the cathode precursor material provided in Example 3.

[0045] Figure 7 This is a distribution diagram of phosphorus in the cathode precursor material provided in Example 3. Detailed Implementation

[0046] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0047] Example 1

[0048] This embodiment provides a nickel-cobalt-manganese cathode precursor material, which includes a nickel-cobalt-manganese hydroxide precursor matrix material and phosphate and lanthanum doped into the precursor matrix material.

[0049] The preparation method of the nickel-cobalt-manganese cathode precursor material is as follows:

[0050] Step 1: Prepare a ternary solution (a mixture of sulfur, nickel, cobalt, manganese, and lanthanum sulfates) with a molar ratio of Ni:Co:Mn = 0.7:0.13:0.17 (0.17+x+y=1) of 1.72 mol / L. The concentration of La in the ternary solution is 1.14 mmol / L, the molar concentration of diammonium hydrogen phosphate solution is 0.033 mol / L (which is the molar concentration of phosphorus), the concentration of sodium hydroxide solution is 8 mol / L, and the concentration of ammonia water is 4.7 mol / L.

[0051] Step 2: The flow rates of the lanthanum-doped ternary solution (sulfate), phosphorus solution, sodium hydroxide solution, and ammonia solution, with a molar ratio of Ni:Co:Mn=x:y:0.17 (0.17+x+y=1), were controlled at 320 mL / h, 15 mL / h, 103 mL / h, and 24 mL / h, respectively, and were injected concurrently into a stirrer at a stirring speed of 200 rpm, a temperature of 54℃, and a pH of 11.2~11.4 to carry out the co-precipitation reaction.

[0052] Step 3: After the co-precipitation reaction is complete, the slurry is pumped into a vacuum filter funnel and washed with hot water and liquid alkali.

[0053] Step 4: Dry the filter residue obtained by vacuum filtration and washing in an oven at 150°C to finally obtain the nickel-cobalt-manganese cathode precursor material.

[0054] Example 2

[0055] This embodiment provides a nickel-cobalt-manganese cathode precursor material, which includes a nickel-cobalt-manganese hydroxide precursor matrix material and phosphate and lanthanum doped into the precursor matrix material.

[0056] The preparation method of the nickel-cobalt-manganese cathode precursor material is as follows:

[0057] Step 1: Prepare a ternary solution (a mixture of sulfur, nickel, cobalt, manganese, and lanthanum sulfates) with a molar ratio of Ni:Co:Mn = 0.6:0.23:0.17 (0.17+x+y=1) of 1.74 mol / L. The concentration of La in the ternary solution is 5.73 mmol / L, the molar concentration of disodium hydrogen phosphate solution is 0.1 mol / L (which is the molar concentration of phosphorus), the concentration of sodium hydroxide solution is 8 mol / L, and the concentration of ammonia is 4.7 mol / L.

[0058] Step 2: The flow rates of the lanthanum-doped ternary solution (sulfate), phosphorus solution, sodium hydroxide solution, and ammonia solution, with a molar ratio of Ni:Co:Mn=x:y:0.17 (0.17+x+y=1), were controlled to be 320 mL / h, 15 mL / h, 103 mL / h, and 24 mL / h, respectively, and were injected into the stirrer in a parallel flow. The stirring speed was 320 rpm, the temperature was 54℃, and the pH was 11.2~11.4 to carry out the co-precipitation reaction.

[0059] Step 3: After the co-precipitation reaction is complete, the slurry is pumped into a vacuum filter funnel and washed with hot water and liquid alkali.

[0060] Step 4: Dry the filter residue obtained by vacuum filtration and washing in an oven at 150°C to finally obtain the nickel-cobalt-manganese cathode precursor material.

[0061] Example 3

[0062] This embodiment provides a nickel-cobalt-manganese cathode precursor material, which includes a nickel-cobalt-manganese hydroxide precursor matrix material and phosphate and lanthanum doped into the precursor matrix material.

[0063] The preparation method of the nickel-cobalt-manganese cathode precursor material is as follows:

[0064] Step 1: Prepare a ternary solution (a mixture of sulfur, nickel, cobalt, manganese, and lanthanum sulfates) with a molar ratio of Ni:Co:Mn = 0.7:0.13:0.17 (0.17+x+y=1) of 1.72 mol / L. The concentration of La in the ternary solution is 1.74 mmol / L, the molar concentration of sodium phosphate solution is 0.17 mol / L (which is the molar concentration of phosphorus), the concentration of sodium hydroxide solution is 8 mol / L, and the concentration of ammonia is 4.7 mol / L.

[0065] Step 2: The flow rates of the lanthanum-doped ternary solution (sulfate), phosphorus solution, sodium hydroxide solution, and ammonia solution, with a molar ratio of Ni:Co:Mn=x:y:0.17 (0.17+x+y=1), were controlled at 320 mL / h, 15 mL / h, 103 mL / h, and 24 mL / h, respectively, and were injected concurrently into a stirrer at a stirring speed of 300 rpm, a temperature of 58℃, and a pH of 10.5~11.4 to carry out the co-precipitation reaction.

[0066] Step 3: After the co-precipitation reaction is complete, the slurry is pumped into a vacuum filter funnel and washed with hot water and liquid alkali.

[0067] Step 4: Dry the filter residue obtained by vacuum filtration and washing in an oven at 150°C to finally obtain the nickel-cobalt-manganese cathode precursor material.

[0068] Example 4

[0069] The difference between this embodiment and Embodiment 1 is that the molar concentration of lanthanum ions in the ternary solution in this embodiment is 0.5 mmol.

[0070] The remaining preparation methods and parameters are consistent with those in Example 1.

[0071] Example 5

[0072] The difference between this embodiment and Embodiment 1 is that the molar concentration of lanthanum ions in the ternary solution in this embodiment is 2 mmol.

[0073] The remaining preparation methods and parameters are consistent with those in Example 1.

[0074] Example 6

[0075] The difference between this embodiment and Embodiment 1 is that the molar concentration of the sodium phosphate solution in this embodiment is 0.01 mol / L.

[0076] The remaining preparation methods and parameters are consistent with those in Example 1.

[0077] Example 7

[0078] The difference between this embodiment and Embodiment 1 is that the molar concentration of the sodium phosphate solution in this embodiment is 0.2 mol / L.

[0079] The remaining preparation methods and parameters are consistent with those in Example 1.

[0080] Comparative Example 1

[0081] The difference between this comparative example and Example 1 is that the positive electrode precursor material in this example is not doped with phosphate.

[0082] Sodium phosphate solution is not added in the preparation method.

[0083] The remaining preparation methods and parameters are consistent with those in Example 1.

[0084] Comparative Example 2

[0085] The difference between this comparative example and Example 1 is that the cathode precursor material in this example is not doped with lanthanum.

[0086] In the preparation method, the ternary solution does not contain lanthanum ions.

[0087] The remaining preparation methods and parameters are consistent with those in Example 1.

[0088] Figure 1 The SEM image of the cathode precursor material provided in Example 1 is shown. Figure 2 The distribution diagram of lanthanum in the cathode precursor material provided in Example 1 is shown. Figure 3 The distribution of phosphorus in the cathode precursor material provided in Example 1 is shown.

[0089] Figure 4 The SEM image of the cathode precursor material provided in Example 2 is shown.

[0090] Figure 5 The SEM image of the cathode precursor material provided in Example 3 is shown. Figure 6 The distribution diagram of lanthanum in the cathode precursor material provided in Example 3 is shown. Figure 7 The distribution of phosphorus in the cathode precursor material provided in Example 3 is shown.

[0091] from Figures 1-7 As can be seen, the morphology under all conditions is a double-interlaced needle-like structure, and lanthanum and P are also uniformly distributed in the material structure.

[0092] A comparison of Examples 1 and Examples 4-7 shows that, in this invention, the molar concentration of lanthanum in the mixed salt solution and the molar concentration of the phosphate doping source solution are synergistically combined to improve the cycling stability of the material.

[0093] The materials provided in Example 1 and Comparative Examples 1-2 were mixed with lithium hydroxide at a molar ratio of Li:M (M being a metal element) = 1.05 and calcined in air at 800°C for 13 hours to obtain positive electrode materials.

[0094] The positive electrode materials provided in Example 1 and Comparative Examples 1-2 were used as positive electrode active materials, with a mass ratio of positive electrode active material:PVDF:SP of 95:3:2. NMP was added to obtain a positive electrode slurry, which was then coated onto the surface of an aluminum foil to obtain a positive electrode sheet.

[0095] A coin cell is obtained by assembling a lithium sheet as the counter electrode with a positive electrode.

[0096] Electrochemical performance tests were conducted on the coin cells provided in Example 1 and Comparative Examples 1-2. The test conditions were: electrochemical window: 2.5-4.3V, cyclic testing at 0.2C / 0.5C for 100 cycles. The test results are shown in Table 1.

[0097] Table 1

[0098]

[0099] As can be seen from the data results of Example 1 and Comparative Examples 1-2, in this invention, phosphate doping and lanthanum doping work synergistically to achieve better high cycling performance of the material; without phosphate doping, the cycling performance of the material decreases significantly; and without lanthanum doping, the Li ion transport efficiency in the material is too low, which leads to a decrease in cycling performance.

[0100] In summary, the nickel-cobalt-manganese cathode precursor material provided by this invention, through the synergistic doping of phosphate ions and lanthanum, forms uniformly dispersed microcrystals in the substrate material by complexing phosphate ions with nickel, cobalt, manganese, and lanthanum. This stabilizes the precursor material's structure, increases its density, achieves homogeneous doping of anions and cations, effectively stabilizes lanthanum and phosphorus elements in nickel, cobalt, and manganese, and enhances the structural stability of the cathode material, thereby improving its electrochemical performance. Furthermore, during the preparation process, lanthanum and nickel, cobalt, and manganese are fed together, while the phosphate dopant source is fed separately, achieving uniform doping of phosphate and lanthanum, reducing redundant steps, and effectively stabilizing the lanthanum and phosphorus content in nickel, cobalt, and manganese. Existing mature co-precipitation processes can be used, reducing process modifications and lowering costs.

[0101] The present invention has been illustrated with detailed structural features through the above embodiments. However, the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the components used in the present invention, additions of auxiliary components, and selection of specific methods all fall within the protection and disclosure scope of the present invention. The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0102] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0103] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

[0104] The scope of protection of this invention is not limited thereto. Those skilled in the art should understand that any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this invention fall within the scope of protection and disclosure of this invention.

Claims

1. A cation-anion double-doped nickel-cobalt-manganese cathode precursor material, characterized in that, The nickel-cobalt-manganese positive electrode precursor material comprises a precursor matrix material and a doping element doped in the precursor matrix material; the doping element comprises phosphorus and lanthanum, and the phosphorus doping is phosphate doping; The anion-cation double-doped nickel-cobalt-manganese positive electrode precursor material is prepared by a preparation method comprising the following steps: The nickel-cobalt-manganese-lanthanum mixed salt solution, the phosphate doping source solution, the precipitant solution and the complexing agent solution are added in parallel flow to perform a coprecipitation reaction to obtain the anion-cation double-doped nickel-cobalt-manganese positive electrode precursor material.

2. The anion-cation double doped nickel-cobalt-manganese cathode precursor material of claim 1, wherein, The precursor matrix material comprises a nickel-cobalt-manganese hydroxide precursor matrix material.

3. A method of producing a cation-anion double-doped nickel-cobalt-manganese cathode precursor material according to claim 1 or 2, characterized in that The preparation method comprises the following steps: The nickel-cobalt-manganese-lanthanum mixed salt solution, the phosphate doping source solution, the precipitant solution and the complexing agent solution are added in parallel flow to perform a coprecipitation reaction to obtain the anion-cation double-doped nickel-cobalt-manganese positive electrode precursor material.

4. The method for preparing the anion-cation dual-doped nickel-cobalt-manganese cathode precursor material according to claim 3, characterized in that, The total molar concentration of metal ions in the nickel-cobalt-manganese-lanthanum mixed salt solution is 1.5-2 mol / L.

5. The method of making a cationic and anionic double doped nickel-cobalt-manganese cathode precursor material according to claim 3, wherein, The molar concentration of lanthanum in the nickel-cobalt-manganese-lanthanum mixed salt solution is 1-6 mmol / L.

6. The method of making a cationic and anionic double doped nickel-cobalt-manganese cathode precursor material according to claim 3, wherein, The molar concentration of phosphorus in the phosphate doping source solution is 0.03-0.17 mol / L.

7. The method of making a cationic and anionic double doped nickel-cobalt-manganese cathode precursor material according to claim 3, characterized in that, The phosphate doping source comprises any one or a combination of at least two of disodium hydrogen phosphate, sodium dihydrogen phosphate, sodium phosphate, diaminium hydrogen phosphate or ammonium dihydrogen phosphate.

8. The method of making a cationic and anionic double doped nickel-cobalt-manganese cathode precursor material according to claim 3, characterized in that, The precipitant comprises sodium hydroxide and / or potassium hydroxide.

9. The method of making a cationic and anionic double doped nickel-cobalt-manganese cathode precursor material according to claim 3, characterized in that, The complexing agent comprises ammonia water.

10. The method of making a cationic and anionic double doped nickel-cobalt-manganese cathode precursor material of claim 3, wherein, The temperature of the coprecipitation reaction is 50-60°C.

11. The method of making a cationic and anionic double doped nickel-cobalt-manganese cathode precursor material according to claim 3, characterized in that, The stirring rate of the coprecipitation reaction is 180-350 rpm.

12. The method of making a cationic and anionic double doped nickel-cobalt-manganese cathode precursor material according to claim 3, wherein, The pH value of the coprecipitation reaction is 9.5-12.

13. The method of making a cationic and anionic double doped nickel-cobalt-manganese cathode precursor material of claim 3, wherein, After the coprecipitation reaction, filtration, washing and drying are sequentially performed.

14. The method of making a cationic and anionic double doped nickel-cobalt-manganese cathode precursor material of claim 3, wherein, The preparation method comprises the following steps: The nickel-cobalt-manganese-lanthanum mixed salt solution, the phosphate doping source solution with a molar concentration of phosphorus of 0.03-0.17 mol / L, the precipitant solution and the complexing agent solution are added in parallel flow, the pH value is maintained at 9.5-12, the coprecipitation reaction is performed at 50-60°C and at a stirring rate of 180-350 rpm, and then filtration, washing and drying are performed to obtain the anion-cation double-doped nickel-cobalt-manganese positive electrode precursor material; The total molar concentration of metal ions in the nickel-cobalt-manganese-lanthanum mixed salt solution is 1.5-2 mol / L; and the molar concentration of lanthanum in the nickel-cobalt-manganese-lanthanum mixed salt solution is 1-6 mmol / L.

15. A positive electrode material, characterized in that, The positive electrode material is obtained by mixing and sintering a lithium source and the anion-cation double-doped nickel-cobalt-manganese positive electrode precursor material according to claim 1 or 2.

16. A lithium-ion battery, characterized by, The lithium ion battery comprises the positive electrode material according to claim 15.

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