Nickel-cobalt-manganese ternary lithium metal battery electrolyte used in extreme environment, preparation method and application thereof, and nickel-cobalt-manganese ternary lithium metal battery

Abstract

The invention belongs to the technical field of lithium metal batteries, and particularly relates to a nickel-cobalt-manganese ternary lithium metal battery electrolyte for an extreme environment, a preparation method and application of the nickel-cobalt-manganese ternary lithium metal battery electrolyte and a nickel-cobalt-manganese ternary lithium metal battery. The invention relates to a nickel-cobalt-manganese ternary lithium metal battery electrolyte for an extreme environment, which comprises the following components: 3, 5-difluorophenylboronic acid neopentyl glycol ester and an organic electrolyte according to a weight ratio of (1-5): 100. The invention further discloses a preparation method of the nickel-cobalt-manganese ternary lithium metal battery electrolyte for the extreme environment and application of the nickel-cobalt-manganese ternary lithium metal battery electrolyte in a nickel-cobalt-manganese ternary lithium metal battery. The nickel-cobalt-manganese ternary lithium metal battery electrolyte is used for improving the cycling stability of the nickel-cobalt-manganese ternary lithium metal battery in the extreme environment. The nickel-cobalt-manganese ternary lithium metal battery electrolyte is used for preparing a nickel-cobalt-manganese ternary lithium metal battery in an extreme environment. According to the invention, the problem that the lithium metal battery is difficult to give consideration to efficient ion transmission and cathode and anode interface stability at the same time in an extreme environment is solved, and the cycling stability of the nickel-cobalt-manganese ternary lithium metal battery in the extreme environment is improved.

Description

Technical Field

[0001] This invention belongs to the field of lithium metal battery technology, specifically relating to nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments, preparation method and application, and nickel-cobalt-manganese ternary lithium metal battery. Background Technology

[0002] Lithium metal batteries, with their high theoretical capacity and low redox potential, are considered the core direction of the next generation of high-energy-density energy storage systems. However, under extreme conditions such as high temperature, high pressure, and high current density, traditional carbonate-based electrolytes struggle to synergistically stabilize the interface between the highly active lithium metal anode and the high-nickel ternary cathode (such as NCM811), leading to rapid battery failure and severely restricting their commercial application.

[0003] Current optimization strategies focus on modifying single interfaces, but all face key bottlenecks:

[0004] 1. High-concentration electrolyte (HCE) suppresses lithium dendrites through anion-derived inorganic SEI, but its high viscosity and low wettability hinder its practical application.

[0005] 2. Localized high-concentration electrolytes (LHCE) are introduced with diluents to improve physical properties, but the diluents encapsulate Li. + Solvation of the sheath leads to a decrease in ionic conductivity;

[0006] 3. Weakly solvated electrolytes (WSEs) improve ionic conductivity, but strong ion pairing leads to high desolvation energy barriers, low lithium-ion transference numbers, and insufficient high-voltage stability.

[0007] It is worth noting that although the existing technology CN102629696A discloses a neopentyl glycol 3,5-difluorophenylborate (DANGE) electrolyte containing 2.21 wt%, its verification system is a lithium iron phosphate (LFP) battery, which only retains 29% of its capacity after 100 cycles at 60°C. This result confirms that such electrolytes cannot solve the high-temperature stability problem in mild systems (LFP), while high-nickel ternary systems (NCM) have even more stringent requirements for electrolyte design due to their higher activity and interfacial side reactions. Existing strategies have not overcome the core contradiction of "difficulty in simultaneously improving ion transport efficiency and maintaining the stability of the dual-electrode interface."

[0008] Therefore, there is an urgent need for a novel electrolyte design strategy that can synergistically regulate the dual interfaces of lithium metal anode-electrolyte-high nickel cathode, so as to achieve a balance between high ion conductivity, low interfacial impedance and structural stability under extreme conditions, and provide a solution for high-performance lithium metal batteries. Summary of the Invention

[0009] This invention provides an electrolyte for nickel-cobalt-manganese ternary lithium metal batteries for extreme environments, a preparation method thereof, and its application, as well as a nickel-cobalt-manganese ternary lithium metal battery. It solves the problem that nickel-cobalt-manganese ternary lithium metal batteries are difficult to simultaneously achieve high ion efficiency and anode-cathode interface stability under extreme environments, and improves the cycle stability of nickel-cobalt-manganese ternary lithium metal batteries under extreme environments.

[0010] The first objective of this invention is to provide a nickel-cobalt-manganese ternary lithium metal battery electrolyte for use in extreme environments.

[0011] To achieve the first objective of this invention, a nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments is provided, the electrolyte of which is composed of neopentyl glycol 3,5-difluorophenylboronic acid and an organic electrolyte in a weight ratio of 1 to 5:100.

[0012] In one specific embodiment of the present invention, the nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments is used at 25°C in Li + Number of migrations ≥ 0.6.

[0013] In one specific embodiment of the present invention, the weight ratio of neopentyl glycol 3,5-difluorophenylboronic acid to the organic electrolyte is 3:100.

[0014] In one specific embodiment of the present invention, the organic electrolyte is a carbonate electrolyte.

[0015] The second objective of this invention is to provide a method for preparing the above-mentioned nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments.

[0016] To achieve the second objective mentioned above, a method for preparing a nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments includes the step of mixing neopentyl glycol 3,5-difluorophenylboronic acid with an organic electrolyte at a weight ratio of 1 to 5:100.

[0017] A third objective of this invention is to provide the application of the aforementioned nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments in nickel-cobalt-manganese ternary lithium metal batteries.

[0018] In one specific embodiment of the present invention, the application is for improving the cycle stability of nickel-cobalt-manganese ternary lithium metal batteries at 60°C, current density of 5C and / or charging upper limit voltage of 4.7V.

[0019] The fourth objective of this invention is to provide a nickel-cobalt-manganese ternary lithium metal battery.

[0020] To achieve the fourth objective of this invention, the electrolyte for the nickel-cobalt-manganese ternary lithium metal battery is the aforementioned nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments.

[0021] In one specific embodiment of the present invention, a nickel-cobalt-manganese ternary lithium metal battery is cycled at 60°C for 250 cycles. th Post-capacity retention rate ≥82%.

[0022] In one specific embodiment of the present invention, a nickel-cobalt-manganese ternary lithium metal battery is cycled for 500 cycles at a current density of 5C. th The post-capacity retention rate is ≥75.22%.

[0023] In one specific embodiment of the present invention, a nickel-cobalt-manganese ternary lithium metal battery is cycled for 200 cycles at a charging upper limit voltage of 4.7V. th The post-capacity retention rate is ≥77.43%.

[0024] This invention relates to a nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments, in which neopentyl 3,5-difluorophenylboronic acid diol ester (DNE), possessing Lewis acidic BO bonds, spontaneously adsorbs from the electrolyte due to its electron-deficient properties. Anions were used to reconstruct Li. + The solvated sheath structure significantly reduces the interaction between solvent molecules and Li. + The coordination ratio of Li, thereby reducing the Li-coordination ratio. + Desolvation energy barrier; on the NCM811 anode side of nickel-cobalt-manganese ternary lithium metal batteries, this strategy promotes the formation of a thin and dense LiF-rich SEI layer, effectively suppressing lithium dendrite growth; on the lithium foil cathode side of nickel-cobalt-manganese ternary lithium metal batteries, the fluorinated benzene ring structure of DNE undergoes in-situ polymerization under high pressure to form a B / F-rich network polymer protective layer, which can effectively capture dissolved Ni 2+ Ions can also optimize CEI composition and inhibit cathode structure degradation.

[0025] The beneficial effects of this invention are: 1. The 3,5-difluorophenylboronic acid neopentyl glycol ester of this invention can simultaneously improve the stability of the dual interface (cathode and anode) of lithium metal batteries, and improve the stability of the ion transport cycle performance of lithium metal batteries under extreme environments. 2. After 500 cycles at a high current density of 5C, the capacity retention rate of the lithium metal battery of this invention can reach 76.22%; after 250 cycles at 60℃, the capacity retention rate can reach 82%; after 200 cycles at a high voltage of 4.7V, the capacity retention rate can reach 77.43%; and after 300 cycles at 4.5V and 60℃, the capacity retention rate can reach 70%. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the mechanism of action of adding DNE to the EC / DEC reference electrolyte of this invention;

[0027] Figure 2 This is the NMR spectrum of the nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments in Example 6 of the present invention; where a is...11 b is the NMR spectrum; b is 19 F NMR spectrum;

[0028] Figure 3 Li, as described in Example 6 of this invention, is used in nickel-cobalt-manganese ternary lithium metal battery electrolytes for extreme environments. + Migration curves; where a represents the Li content of the reference electrolyte. + Migration curve; b is the Li content of the nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments. + Migration curve;

[0029] Figure 4 The Li||Li battery of Example 6 of the present invention is at 1 mA cm⁻¹ -2 The following are lithium deposition morphology diagrams; where a represents the baseline electrolyte deposition morphology; and b represents the electrolyte deposition morphology used in extreme environments.

[0030] Figure 5 The images show the cathode lithium deposition particle morphology of the Li||Li battery of Example 6 of the present invention after 50 cycles at a cutoff voltage of 4.7V; a is the cathode lithium deposition particle morphology of the reference electrolyte; b is the cathode lithium deposition particle morphology of the electrolyte used in extreme environments.

[0031] Figure 6 The graph shows the cycling performance of the Li||NCM811 full cell in Example 6 of this invention at 5C.

[0032] Figure 7 The graph shows the cycling performance of the Li||NCM811 full cell in Example 6 of this invention at 60°C.

[0033] Figure 8 The graph shows the cycling performance of the Li||NCM811 full cell of Example 6 of the present invention at 2.8-4.7V.

[0034] Figure 9 The graph shows the cycling performance of the Li||NCM811 full cell of Example 6 of the present invention at 2.8-4.5V and 60℃. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0036] A nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments, comprising neopentyl glycol 3,5-difluorophenylboronic acid and an organic electrolyte in a weight ratio of 1 to 5:100.

[0037] In some instances, nickel-cobalt-manganese ternary lithium metal battery electrolytes for extreme environments exhibit Li... + Migration number ≥ 0.6; as in Example 1, 3,5-difluorophenylboronic acid neopentyl diol ester and organic electrolyte are composed of a weight ratio of 3:100, and its Li at 25°C + Migration number = 0.71.

[0038] In some instances, the mass ratio of neopentyl glycol 3,5-difluorophenylboronic acid to the organic electrolyte is 3:100.

[0039] In some instances, the organic electrolyte is a carbonate electrolyte; the carbonate electrolyte is a reference electrolyte composed of lithium hexafluorophosphate, ethylene carbonate, and diethyl carbonate; wherein the concentration of lithium hexafluorophosphate is 1M; and the volume ratio of ethylene carbonate to diethyl carbonate is 1:1.

[0040] A method for preparing a nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments includes the step of mixing neopentyl glycol 3,5-difluorophenylboronic acid with an organic electrolyte at a weight ratio of 1 to 5:100.

[0041] It should be noted that the preparation of the nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments involves stirring and mixing at 25–30°C for more than 2 hours to ensure that the components of the nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments are fully mixed.

[0042] The application of the above-mentioned nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments in nickel-cobalt-manganese ternary lithium metal batteries.

[0043] In some instances, the application is used to improve the cycle stability of nickel-cobalt-manganese ternary lithium metal batteries at 60°C, a current density of 5C, and / or a charging upper limit voltage of 4.7V.

[0044] It should be noted that cycle stability specifically refers to the capacitance after cycling.

[0045] A nickel-cobalt-manganese ternary lithium metal battery, wherein the electrolyte is the aforementioned nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments.

[0046] It should be noted that the cathode of the nickel-cobalt-manganese ternary lithium metal battery is lithium foil, and its anode is NCM811. The electrolyte of the nickel-cobalt-manganese ternary lithium metal battery used in extreme environments realizes ion transport between the lithium foil and NCM811 on the one hand, and synergistically regulates the stability of the lithium foil-electrolyte-NCM811 dual interface on the other hand.

[0047] It should also be noted that the NCM811 anode is composed of 811 type lithium nickel cobalt manganese oxide powder (LiNi). 0.8 Co 0.1 Mn 0.102 It is composed of polyvinylidene fluoride (PVDF), N-methylpyrrolidone (NMP) and conductive carbon black Super P.

[0048] In some instances, nickel-cobalt-manganese ternary lithium metal batteries employing nickel-cobalt-manganese ternary lithium metal battery electrolytes designed for extreme environments are cycled at 60°C for 250 cycles. th Post-capacity retention rate ≥82%.

[0049] In some instances, nickel-cobalt-manganese ternary lithium metal batteries employing nickel-cobalt-manganese ternary lithium metal battery electrolytes designed for extreme environments have achieved 500 cycles at a current density of 5C. th The post-capacity retention rate is ≥75.22%.

[0050] In some instances, nickel-cobalt-manganese ternary lithium metal batteries employing nickel-cobalt-manganese ternary lithium metal battery electrolytes designed for extreme environments have been cycled 200 times at a maximum charging voltage of 4.7V. th The post-capacity retention rate is ≥77.43%.

[0051] The specific embodiments of the present invention will be further described below with reference to examples, but the present invention is not limited to the scope of the embodiments described herein.

[0052] In the following examples, DNE represents neopentyl glycol 3,5-difluorophenylboronic acid, EC represents ethylene carbonate, DEC represents diethyl carbonate, and lithium hexafluorophosphate has the structural formula LiPF6.

[0053] In the examples below, 1M is represented as 1 mol / L.

[0054] In the following examples and comparative examples, th This can be expressed as the number of loops or cycles, for example, 30. th It is represented as 30 times.

[0055] In the following examples and comparative examples, room temperature refers to the ambient temperature controlled at 25°C during the battery cycle test.

[0056] Example 1

[0057] This embodiment provides a nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments, the preparation method of which includes the following steps:

[0058] 1. Preparation of reference electrolyte: LiPF6 was dissolved in a 1:1 EC / DEC mixed solution to obtain an EC / DEC reference electrolyte with a LiPF6 concentration of 1M;

[0059] 2. Preparation of nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments: Add 3% by weight of DNE to 1 mL of EC / DEC reference electrolyte and stir thoroughly at 25 °C for 2 h to obtain an electrolyte for extreme environments.

[0060] Example 2

[0061] This embodiment prepares a nickel-cobalt-manganese lithium metal battery electrolyte for extreme environments according to the steps of Example 1, with the only difference being that "adding 3% of its weight of DNE" in step 1 is changed to "adding 2% of its weight of DNE".

[0062] Example 3

[0063] This embodiment prepares a nickel-cobalt-manganese lithium metal battery electrolyte for extreme environments according to the steps of Example 1, with the only difference being that "adding 3% of its weight of DNE" in step 1 is changed to "adding 1% of its weight of DNE".

[0064] Example 4

[0065] This embodiment prepares a nickel-cobalt-manganese lithium metal battery electrolyte for extreme environments according to the steps of Example 1, with the only difference being that "adding 3% of its weight of DNE" in step 1 is changed to "adding 4% of its weight of DNE".

[0066] Example 5

[0067] This embodiment prepares a nickel-cobalt-manganese lithium metal battery electrolyte for extreme environments according to the steps of Example 1, with the only difference being that "adding 3% of its weight of DNE" in step 1 is changed to "adding 5% of its weight of DNE".

[0068] Example 6

[0069] This embodiment characterizes the nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments described in Example 1:

[0070] Depend on Figure 1 The schematic diagram illustrating the mechanism of action of DNE in the provided EC / DEC reference electrolyte shows that, due to the addition of DNE, DNE has an anchoring effect on anions, Li + The weakening of the binding with anions accelerates the Li... + The migration.

[0071] From the appendix Figure 2 The NMR spectrum of the electrolyte used in extreme environments is visible. Figure 2 a 11 B NMR spectra show that the BO bonds of DNE coordinate with other ions or molecules after being added to the EC / DEC reference electrolyte; Figure 2 b 19 The F NMR spectrum shows that The peak shifts towards higher fields, indicating The increased density of the surrounding electron cloud can be attributed to Li + and The combination weakens.

[0072] From the appendix Figure 3 Li for electrolytes in extreme environments + As can be seen from the ion transport number curve, adding 3 wt% DNE to the EC / DEC reference electrolyte can increase the Li content of the reference electrolyte. + Number of migrations t Li+ The increase from 0.31 to 0.71 is due to the fact that after the anion is anchored by DNE, solvent molecules have difficulty entering the sheath, thereby reducing the Li... + The desolvation energy barrier.

[0073] From the appendix Figure 4 Li||Li batteries assembled for extreme environment electrolytes and reference electrolytes at 1 mA cm⁻¹ -2 The lithium deposition morphology below shows that Figure 4 b. In nickel-cobalt-manganese ternary lithium metal battery electrolytes used in extreme environments, the lithium metal electrode surface is deposited more uniformly and densely, while Figure 4 Lithium deposited in a reference electrolyte exhibits loose and coarse dendrites.

[0074] From the appendix Figure 5 The cathode lithium deposition particle morphology of Li||NCM811 batteries assembled for extreme environment electrolytes and reference electrolytes after 50 cycles at a cutoff voltage of 4.7V shows that the interfacial phase derived from the extreme environment electrolyte can better prevent cathode crack propagation under high pressure, verifying its interfacial stability advantage.

[0075] From the appendix Figure 6 The cycling performance of Li||NCM811 full cells assembled with nickel-cobalt-manganese ternary lithium metal battery electrolytes for extreme environments and reference electrolytes at room temperature, 5C charge / 5C discharge, and high current densities of 2.8-4.3V (discharge cutoff voltage 2.8V, charge upper limit voltage 4.3V) is shown. The Li||NCM811 full cell assembled with the electrolyte for extreme environments exhibits excellent cycling performance after 500 cycles. th The capacity retention remained at 76.22%, compared to the baseline electrolyte at 350 cycles. th The capacity retention rate was only 34.96% of the original.

[0076] From the appendix Figure 7 The Li||NCM811 full cells assembled with nickel-cobalt-manganese ternary lithium metal battery electrolytes for extreme environments and a reference electrolyte, respectively, showed good cycling performance under high-temperature conditions of 60℃, 1C charge / 1C discharge, and 2.8-4.3V (discharge cutoff voltage 2.8V, charging upper limit voltage 4.3V). The Li||NCM811 full cells assembled with the nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments showed good cycling performance after 250 cycles. th The capacity retention remained at 82%, compared to the Li||NCM811 full cell assembled with the reference electrolyte after 250 cycles. th After that, the capacity retention rate was only 33% of the original.

[0077] From the appendix Figure 8 The cycling performance of Li||NCM811 full cells assembled using electrolytes for extreme environments and reference electrolytes under high voltage conditions of room temperature, 1C charge / 1C discharge, and 2.8-4.7V (discharge cutoff voltage 2.8V, charge upper limit voltage 4.7V) is evident. The Li||NCM811 full cells assembled using nickel-cobalt-manganese ternary lithium metal battery electrolytes for extreme environments exhibit excellent cycling performance after 200 cycles. th The capacity retention remained at 77.43%, compared to the Li||NCM811 full cell assembled with the reference electrolyte after 100 cycles. th After that, the capacity retention rate was only 67.84% of the original.

[0078] From the appendix Figure 9 The cycling performance of Li||NCM811 full cells assembled with electrolytes for extreme environments and reference electrolytes under extreme conditions of 60℃, 1C charge / 1C discharge, and 2.8-4.5V (discharge cutoff voltage 2.8V, charge upper limit voltage 4.5V) is shown. The Li||NCM811 full cells assembled with nickel-cobalt-manganese ternary lithium metal battery electrolytes for extreme environments exhibit excellent performance after 300 cycles. th The capacity retention remained at 70%, compared to the Li||NCM811 full cell assembled with the reference electrolyte after 300 cycles. th After that, the capacity retention rate was only 27% of the original.

[0079] Comparative Example

[0080] In the prior art, such as in reference document 1 (publication number CN102629696A), the electrolyte and electrochemical device used in an electrochemical device are employed to prepare lithium iron phosphate metal batteries, with electrolyte concentrations of 0.56%, 1.12%, and 2.21% of neopentyl glycol 3,5-difluorophenylboronic acid ester. The lithium iron phosphate metal battery undergoes 100 cycles at 60°C, 1C charge / 1C discharge, and 2.5V. thSubsequently, the capacity percentages were 48%, 25%, and 29% respectively; its lithium iron phosphate metal battery underwent 30 cycles at room temperature, 1C charge / 5C discharge, and 2.5V. th After that, the capacitance percentages were 65%, 56%, and 55% respectively.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments, characterized in that, Its components consist of neopentyl glycol 3,5-difluorophenylboronic acid and organic electrolyte in a weight ratio of 1 to 5:

100.

2. The nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments according to claim 1, characterized in that: Its Li at 25℃ + Number of migrations ≥ 0.

6.

3. The nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments according to claim 1, characterized in that: The weight ratio of neopentyl glycol 3,5-difluorophenylboronic acid to the organic electrolyte is 3:

100.

4. The nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments according to claim 1, characterized in that: The organic electrolyte is a carbonate electrolyte.

5. The method for preparing the nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments according to any one of claims 1-4, characterized in that: The method includes the step of mixing neopentyl glycol 3,5-difluorophenylboronic acid with an organic electrolyte at a weight ratio of 1 to 5:

100.

6. The application of the nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments as described in any one of claims 1-4 in nickel-cobalt-manganese ternary lithium metal batteries; preferably, it is used to improve the cycle stability of nickel-cobalt-manganese ternary lithium metal batteries at 60°C, current density of 5C and / or charging voltage limit of 4.7V.

7. A nickel-cobalt-manganese ternary lithium metal battery, characterized in that, The electrolyte of the nickel-cobalt-manganese ternary lithium metal battery is the nickel-cobalt-manganese ternary lithium metal battery electrolyte for extreme environments as described in any one of claims 1-4.

8. The nickel-cobalt-manganese ternary lithium metal battery according to claim 7, characterized in that: Nickel-cobalt-manganese ternary lithium metal batteries cycle at 60°C for 250 cycles th Post-capacity retention rate ≥82%.

9. The nickel-cobalt-manganese ternary lithium metal battery according to claim 7, characterized in that: Nickel-cobalt-manganese ternary lithium metal batteries cycle for 500 cycles at a current density of 5C. th The capacity retention rate is ≥75.22%.

10. The nickel-cobalt-manganese ternary lithium metal battery according to claim 7, characterized in that: Nickel-cobalt-manganese ternary lithium metal batteries can cycle 200 times at a maximum charging voltage of 4.7V. th The post-capacity retention rate is ≥77.43%.

Images