Method for preparing NCA positive electrode material through one-step doping, coating and modifying

A positive electrode material and coating technology, which is applied in the field of preparation of NCA positive electrode materials, can solve the problems of long production time and high production cost, and achieve the effects of improving safety, simplifying stability and reducing production cost

Inactive Publication Date: 2021-01-08
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

In the actual production process, it is generally divided into doping first firing and coating second firing, which also includes two times of mixing. The production time is long and the production cost is high.

Method used

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  • Method for preparing NCA positive electrode material through one-step doping, coating and modifying
  • Method for preparing NCA positive electrode material through one-step doping, coating and modifying
  • Method for preparing NCA positive electrode material through one-step doping, coating and modifying

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Embodiment 1

[0031] This embodiment provides a method for preparing a one-step doping coating modified NCA positive electrode material, including the following steps:

[0032] Taking nickel sulfate, cobalt sulfate, and sodium metaaluminate according to the metal cation molar ratio of 0.88:0.09:0.03 to prepare a mixed solution of nickel, cobalt, and sodium cations with a total concentration of 2mol / L, nickel sulfate, cobalt sulfate, and sodium metaaluminate, At a concentration of 0.2mol / L ammonia water, complex co-precipitation occurs at a volume ratio of 1:1. After aging, centrifugation, and drying, the average particle size D50: 8μm is obtained; the specific surface area BET: 10m 2 / g; bulk density: 1.1g / cm 3 , Tap density: 1.8g / cm 3 The precursor of Ni 0.88 co 0.09 Al 0.03 (OH) 2 .

[0033] Add absolute ethanol to the precursor prepared above, and stir and mix lithium hydroxide, nano-zirconia, nano-titanium oxide and ammonium metatungstate in a constant temperature water bath cruci...

Embodiment 2

[0036] This embodiment provides a method for preparing a one-step doping coating modified NCA positive electrode material, including the following steps:

[0037] Taking nickel sulfate, cobalt sulfate, and sodium metaaluminate according to the metal cation molar ratio of 0.88:0.09:0.03 to prepare a mixed solution of nickel, cobalt, and sodium cations with a total concentration of 2mol / L, nickel sulfate, cobalt sulfate, and sodium metaaluminate, At a concentration of 0.3mol / L ammonia water, complex co-precipitation occurs at a volume ratio of 1:1. After aging, centrifugation, and drying, the average particle size D50: 7.8μm; specific surface area BET: 11m 2 / g; bulk density: 1.1g / cm 3 , Tap density: 1.8g / cm 3 The precursor of Ni 0.88 co 0.09 Al 0.03 (OH) 2 .

[0038] Add absolute ethanol to the precursor prepared above, and stir and mix lithium hydroxide, nano-zirconia, nano-titanium oxide and ammonium metatungstate in a constant temperature water bath crucible at 80°C, t...

Embodiment 3

[0041] This embodiment provides a method for preparing a one-step doping coating modified NCA positive electrode material, including the following steps:

[0042] Taking nickel sulfate, cobalt sulfate, and sodium metaaluminate according to the metal cation molar ratio of 0.88:0.09:0.03 to prepare a mixed solution of nickel, cobalt, and sodium cations with a total concentration of 2mol / L, nickel sulfate, cobalt sulfate, and sodium metaaluminate, At a concentration of 0.2mol / L ammonia water, complex co-precipitation occurs at a volume ratio of 1:1. After aging, centrifugation, and drying, the average particle size D50: 8.2μm; specific surface area BET: 9m 2 / g; bulk density: 1.2g / cm 3 , Tap density: 1.8g / cm 3 The precursor of Ni 0.88 co 0.09 al 0.03 (OH) 2 .

[0043] Add absolute ethanol to the precursor prepared above, and stir and mix lithium hydroxide, nano-zirconia, nano-titanium oxide and ammonium metatungstate in a constant temperature water bath crucible at 80°C, th...

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Abstract

The invention relates to a method for preparing a NCA positive electrode material through one-step doping, coating and modifying. The method comprises the following steps: (1) preparing a precursor NixCoyAlz(OH)2 from soluble salts of nickel, cobalt and aluminum in an alkaline environment; (2) fully and uniformly mixing the precursor, a lithium source, a doping agent A and a coating agent B in absolute ethyl alcohol in a constant-temperature water bath kettle; and (3) drying the volatilized ethanol, sintering the dried mixed powder at a sintering temperature of 800-1000 DEG C, and crushing andsieving to obtain the single crystal NCA positive electrode material with the surface layer coated with B and the matrix doped with A. According to the one-step doping and coating preparation method,the production time is greatly shortened and the cost is reduced in industrial production, and the Li/Ni mixed arrangement of the material and the side reaction in the battery are reduced under the combined action of doping and coating, so that the material has high capacity, long cycle, high safety and the like.

Description

technical field [0001] The invention relates to the field of preparation of lithium ion ternary positive electrode materials, in particular to a preparation method of NCA positive electrode material modified by one-step doping and coating. Background technique [0002] The increasing shortage of non-renewable energy in the world has prompted the rapid development of the renewable new energy industry. New energy lithium-ion powered vehicles have begun to gradually replace traditional fuel vehicles, but their development is limited to a certain extent due to their endurance, stability and safety. NCA and NCM are considered to be the most potential cathode materials for lithium-ion powered vehicles due to their high energy density, long cycle life, good stability and safety. [0003] Since 2013, domestic new energy vehicle subsidies have maintained an overall downward trend; in 2018, financial subsidies for models with a driving range of less than 150km were stopped, while sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/485H01M4/525H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCC01G53/42H01M4/525H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2004/61C01P2006/12Y02E60/10
Inventor 余永言毛秦钟徐万润刘焕朝尚鹏坤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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