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LiAlO2 coated LiNi1-xCoxO2 lithium-ion battery positive electrode material and preparation method thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as product particle size distribution and surface coating unevenness, difficulty in controlling stoichiometric ratio, and poor electrochemical performance. Achieve the effects of enhancing high-current charge-discharge performance and thermal stability, excellent electrochemical performance, and improving specific capacity

Active Publication Date: 2015-12-23
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method overcomes the shortcomings of the simple solid-phase synthesis method, such as long preparation time, difficulty in controlling the stoichiometric ratio, uneven product particle size distribution and surface coating, and poor electrochemical performance. The prepared product has high purity, high chemical uniformity, Good coating effect, high crystal quality, fine and uniform distribution of product particles, excellent electrochemical performance and low manufacturing cost

Method used

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  • LiAlO2 coated LiNi1-xCoxO2 lithium-ion battery positive electrode material and preparation method thereof
  • LiAlO2 coated LiNi1-xCoxO2 lithium-ion battery positive electrode material and preparation method thereof
  • LiAlO2 coated LiNi1-xCoxO2 lithium-ion battery positive electrode material and preparation method thereof

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Experimental program
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Embodiment 1

[0041] 1.08-1.15mol lithium hydroxide and 1.0mol Ni prepared by co-precipitation 0.8 co 0.2 (OH) 2 Mix the precursors evenly, put them into a ball mill, add an appropriate amount of absolute ethanol, grind to the required particle size, evaporate, dry, remove and recover the ethanol, and the obtained mixture containing Li, Ni, and Co is heated in oxygen-enriched air and at an appropriate temperature. (350~500℃) pre-fired for 2-10h, take out and grind, then sinter in oxygen-enriched air or pure oxygen atmosphere and at an appropriate temperature (650~900℃) for 10-16h, take out and grind and sieve , take the product between 1 and 25 μm to get LiNi 0.8 co 0.2 o 2 parent cathode material. XRD and electrochemical performance tests were carried out on the material.

[0042] 1.0molLiNi 0.8 co 0.2 o 2 About 98.0g of the matrix positive electrode material is dispersed in an appropriate amount of deionized water, stirred to obtain a uniform suspension A; a proportional amount o...

Embodiment 2

[0045] Add 1.08-1.15mol of lithium hydroxide, 0.80mol of nickel acetate, 0.20mol of cobalt acetate and 1.2mol of citric acid into the container and mix evenly. Add an appropriate amount of deionized water into the container and stir vigorously until a transparent dark sol is obtained. With stirring, the sol was evaporated on a water bath at 50-80°C until a dark colored gel was obtained. Then the gel was dried overnight at 120° C. in a blast oven to obtain a dark xerogel containing Li, Ni, and Co. The obtained dark xerogel containing Li, Ni and Co is pre-calcined for 2-10 hours in oxygen-enriched air at a suitable temperature (350-550° C.), taken out and ground to obtain a precursor. The precursor is then sintered in an oxygen-enriched air or pure oxygen atmosphere and at an appropriate temperature (650-900°C) for 10-16 hours, taken out, ground and sieved, and the product between 1 and 25 μm is obtained to obtain LiNi 0.8 co 0.2 o 2 parent cathode material. XRD and electroc...

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Abstract

The present invention belongs to the field of lithium-ion batteries, and provide a modified lithium-ion battery positive electrode material LiNi1-xCoxO2@LiAlO2 with high thermal-stability LiAlO2 coated on the LiNi1-xCoxO2 surface, and a preparation method thereof. A purpose of the present invention is to overcome the disadvantages of overcharging intolerance and pool thermal-stability of the lithium-ion battery LiNi1-xCoxO2 (x is more than 0 and is less than or equal to 0.5) positive electrode material. According to the present invention, the positive electrode material of the present invention has characteristics of good thermal-stability, good discharge specific capacity and excellent cycle stability compared with the LiNi1-xCoxO2 positive electrode material, can meet the large rate charge and discharge requirements, and is especially suitable for the positive electrode material of the electric vehicle power battery; and the product prepared through the preparation method has characteristics of high purity, high chemical uniformity, good coating effect, high crystal quality, fine particle, uniform distribution, excellent electrochemical performance and low manufacturing cost.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to a lithium-ion battery positive electrode material and a preparation method thereof, specifically LiNi, a lithium-ion battery positive electrode material 1-x co x o 2 @LiAlO 2 and a preparation method thereof, wherein 0<x≤0.5. Background technique [0002] With the deteriorating global environment and climate, energy conservation and emission reduction are imminent, and the international community is paying more and more attention to the development and application of new energy and renewable clean energy. As an excellent performance and environmentally friendly secondary battery, lithium-ion batteries have the advantages of high energy density, fast charging, small self-discharge, long-term storage, excellent cycle performance, and no memory effect. They have been widely used in various portable electronic devices. and will become the preferred power source for electric ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 刘兴泉王治国熊伟强赵红远陈炳张峥
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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