Method for preparing high-nickel long-cycle single-crystal lithium ion battery positive-pole material

A technology for lithium ion batteries and cathode materials, which is applied in the field of lithium ion power batteries for new energy vehicles, can solve the problems of poor normal temperature and high temperature cycle performance, low compaction density, poor storage capacity, etc., and achieves improved normal temperature and high temperature cycle performance. , uniform coating, good consistency

Inactive Publication Date: 2019-11-15
ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, "high-nickel NCM secondary granular cathode materials" have problems such as poor room temperature and high temperature cycle performance, poor rate performance, low compaction density and poor storage capacity.

Method used

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  • Method for preparing high-nickel long-cycle single-crystal lithium ion battery positive-pole material
  • Method for preparing high-nickel long-cycle single-crystal lithium ion battery positive-pole material
  • Method for preparing high-nickel long-cycle single-crystal lithium ion battery positive-pole material

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Experimental program
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Effect test

Embodiment 1

[0047] This embodiment provides a method for preparing a high-nickel, long-cycle single crystal lithium-ion battery positive electrode material, comprising the following steps:

[0048] (1) Mix soluble nickel salt, cobalt salt, manganese salt, alkali metal hydroxide and ammonia water, and flow into a reaction kettle with bottom liquid and protective gas for constant temperature co-precipitation, and solidify the spilled material after sufficient reaction Liquid separation, aging, centrifugation, and drying to obtain spherical high-nickel NCM ternary precursor materials; wherein the co-precipitation reaction conditions are as follows: according to the molar ratio of nickel ions: cobalt ions: manganese ions is 0.85:0.1:0.05, the preparation of metal The total ion concentration is 2mol / L; the concentration of NaOH solution is prepared to be 8mol / L, and the concentration of ammonia solution is prepared to be 120g / L; the three solutions are respectively fed into the reaction kettle ...

Embodiment 2

[0055] This embodiment provides a method for preparing a high-nickel, long-cycle single crystal lithium-ion battery positive electrode material, comprising the following steps:

[0056] (1) Mix soluble nickel salt, cobalt salt, manganese salt, alkali metal hydroxide and ammonia water, and flow into a reaction kettle with bottom liquid and protective gas for constant temperature co-precipitation, and solidify the spilled material after sufficient reaction Liquid separation, aging, centrifugation, and drying to obtain a spherical high-nickel NCM ternary precursor material; wherein the co-precipitation reaction conditions are as follows: according to the solution of nickel ion: cobalt ion: manganese ion molar ratio of 0.8:0.1:0.1, prepare metal The total ion concentration is 1.5mol / L, the concentration of the prepared NaOH solution is 8mol / L, and the concentration of the prepared ammonia solution: 100g / L; the three solutions are respectively passed into the reaction kettle at 80ml...

Embodiment 3

[0063] This embodiment provides a method for preparing a high-nickel, long-cycle single crystal lithium-ion battery positive electrode material, comprising the following steps:

[0064] (1) Mix soluble nickel salt, cobalt salt, manganese salt, alkali metal hydroxide and ammonia water, and flow into a reaction kettle with bottom liquid and protective gas for constant temperature co-precipitation, and solidify the spilled material after sufficient reaction Liquid separation, aging, centrifugation, and drying to obtain a spherical high-nickel NCM ternary precursor material; wherein the co-precipitation reaction conditions are as follows: according to a solution with a molar ratio of nickel ions: cobalt ions: manganese ions of 0.7:0.15:0.15, the metal The total ion concentration is 1.5mol / L, the concentration of the prepared NaOH solution is 8mol / L, and the concentration of the prepared ammonia solution is 100g / L; the three solutions are simultaneously passed into the reaction kett...

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Abstract

The invention relates to a method for preparing a high-nickel long-cycle single-crystal nickel-cobalt-manganese (NCM) lithium ion battery positive-pole material. The preparation method comprises the following steps: (1) mixing a soluble nickel salt, a cobalt salt, a manganese salt, an alkali metal hydroxide and ammonia water, and enabling the mixture to flow into a reaction kettle for constant-temperature coprecipitation to obtain a high-nickel NCM ternary precursor material; (2) uniformly mixing the high-nickel NCM ternary precursor, lithium hydroxide and an additive A in a wet high-speed mixing mode, carrying out drying, then carrying out primary sintering in an oxygen-enriched atmosphere to obtain a spherical high-nickel NCM ternary positive-pole material; (3) carrying out crushing, smashing and sieving to obtain a high-nickel NCM ternary positive-pole material; and (4) carrying out wet mixing and drying on the high-nickel NCM ternary positive-pole material with a coating agent B, carrying out secondary sintering in an oxygen-enriched atmosphere, and carrying out crushing, smashing and sieving to obtain the high-nickel single-crystal NCM lithium ion battery positive-pole material. The positive-pole material prepared by the method has the advantages of high capacity, good cycle performance, high compaction density and the like.

Description

technical field [0001] The invention relates to the technical field of lithium-ion power batteries for new energy vehicles, in particular to a method for preparing a high-nickel single-crystal lithium-ion battery cathode material. Background technique [0002] Lithium-ion power batteries are the core technical link in the development of new energy vehicles, and the quality of positive electrode materials is the most important thing restricting the development of power batteries. With the increase in the mileage of electric vehicles and the gradual reduction of state subsidies, the energy density requirements for power batteries are also getting higher and higher. [0003] Today, high-capacity, high-voltage, long-cycle, and low-cost cathode materials are the needs of the power battery market. The cathode material has also developed from the initial NCM111 to NCM523, NCM622, and NCM811, NCA. Increasing the nickel content in the positive electrode material while reducing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2002/72C01P2004/01C01P2004/61C01P2006/11C01P2006/12C01P2006/40H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 方明毛秦钟胡子俊戚思炀施翼杰张中彩吉同棕王寅峰钱志挺吴海军
Owner ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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