Method for preparing positive material of high-power lithium ion battery

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve problems such as low electrical conductivity, achieve uniform particle size distribution, shorten intercalation/deintercalation, and enhance storage/release capacity. Effect

Active Publication Date: 2013-02-20
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ternary materials and LiCoO 2 In contrast, its low conductivity has greatly challenged its high-current discharge and high-rate performance.

Method used

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  • Method for preparing positive material of high-power lithium ion battery
  • Method for preparing positive material of high-power lithium ion battery
  • Method for preparing positive material of high-power lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 2 mL of polystyrene balls (~2 μm) in a 50 mL beaker, add 5 mL of 95% ethanol and 25 mL of deionized water dropwise, and disperse them by ultrasonication for 10 min. , CoSO4, MnSO4 (molar ratio Ni:Co:Mn=1:1:1) solution B and CO(NH 2 ) 2 Solution A was added to the beaker one by one, CO(NH 2 ) 2 The molar ratio to the metal salt is 6:1, and the stirring speed is 300rph. After reacting for 24 hours, it was heated and filtered, and the filter cake was vacuum-dried at 80°C. with LiNO 3 After mixing according to the metering ratio, put it in a muffle furnace, raise the temperature to 450°C at a heating rate of 5°C / min, and keep it at this temperature for 5h. Then the temperature was raised to 850°C at a heating rate of 10°C / min, kept at this temperature for 24h, and then directly quenched in air to room temperature. Obtain the positive electrode ternary material LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 .

Embodiment 2

[0025] Take 1mL polypropylene ball (100nm) and 50mL beaker, add dropwise 5mL of 95% ethanol, 15mL of deionized water, and ultrasonic for 10min to disperse it, take it out, put it in a constant temperature water bath at 80°C, and dissolve the dissolved NiCl 2 、CoCl 2 , MnCl 2 (molar ratio Ni:Co:Mn=8:1:1) solution B and (NH 4 ) 2 CO 3 Solution A was added to the beaker in turn, (NH 4 ) 2 CO 3 The molar ratio to the metal salt is 4:1, and the stirring speed is 300rph. After reacting for 24 hours, it was heated and filtered, and the filter cake was vacuum-dried at 80°C. After mixing with LiOH according to the metering ratio, put it in a muffle furnace, raise the temperature to 480°C at a heating rate of 2°C / min, and keep it at this temperature for 4h. Then the temperature was raised to 800°C at a heating rate of 5°C / min, kept at this temperature for 28h, and then directly quenched in air to room temperature. Obtain the positive electrode ternary material LiNi 0.8 co 0.1...

Embodiment 3

[0027]Take 1mL polymethyl methacrylate balls (30nm) and 50mL beaker, add dropwise 5mL of 95% ethanol, 15mL of deionized water, and ultrasonic for 10min to disperse it, take it out, put it in a constant temperature water bath at 80°C, and dissolve the Ni(NO 3 ) 2 , Co(NO 3 ) 2 , Mn(NO 3 ) 2 (molar ratio Ni:Co:Mn=4:2:2) solution B and NH 4 HCO 3 Solution A was added to the beaker in turn, NH 4 HCO 3 The molar ratio to the metal salt is 5:1, and the stirring speed is 300rph. After reacting for 24 hours, it was heated and filtered, and the filter cake was vacuum-dried at 80°C. After mixing with LiOH according to the metering ratio, put it in a muffle furnace, raise the temperature to 480°C at a heating rate of 2°C / min, and keep it at this temperature for 6h. Then the temperature was raised to 860°C at a heating rate of 6°C / min, kept at this temperature for 12h, and then directly quenched in air to room temperature. Obtain the positive electrode ternary material LiNi 0....

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Abstract

The invention provides a method for preparing a positive material of a high-power lithium ion battery. The positive material is LiNixCo1-x-yMnyO2 (0<=x, y<=1, and x+y<=1). The method comprises the following steps: choosing a 0.1-10mu m template ball body, performing emulsification dispersing on the template ball body, adding metal salt solution, then adding precipitator, enabling metal ions to evenly deposit on the surface of the template ball body under the effect of the precipitator, performing hot filtering on the template ball body with the metal ions deposited on the surface to obtain an organic-inorganic compound core shell structure material, and performing thermal treatment to obtain the hollow positive material by evenly mixing the organic-inorganic compound core shell structure material with the lithium salt, wherein the metal salt is metal salt of Ni, Co and Mn. The obtained ternary material has regular hollow spherical shape, is even in grain size and grain fineness distribution, can improve the absorbing/releasing capability on non-water electrolyte of active substances, effectively shortens embedding and de-embedding of the lithium ions, accordingly enhances the storage/transmission performance of the lithium ion battery, and provides effective support for large-current high-magnification charging and discharging, and the compounded ternary material can be applied to power battery materials.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-power lithium-ion battery cathode material LiNi x co 1-x-y mn y o 2 (0≤x, y≤1, x+y≤1) preparation method. Background technique [0002] Since the 1990s, Sony has successfully introduced LiCoO 2 After being introduced to the commercial market, lithium-ion batteries are widely used in various mobile terminal devices such as mobile phones and notebooks at home and abroad due to their high specific capacity, long cycle life, good safety performance, and environmental friendliness. Poor charging performance, coupled with the toxicity and high cost of cobalt make it limited in the field of high-power power batteries (electric bicycles, electric vehicles, communication base station equipment, weapons and aerospace equipment, etc.). Therefore, seeking a high-power alternative lithium-ion cathode material has become a hot spot to expand its application field. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 王盈来姜应律张欣瑞杨国凯
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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