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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 el

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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Example Embodiment

[0040] Example 1

[0041] 1.08-1.15mol lithium hydroxide and 1.0mol Ni prepared by co-precipitation method 0.8 Co 0.2 (OH) 2 The precursors are mixed uniformly, put into a ball mill, add an appropriate amount of absolute ethanol, grind to the required particle size, evaporate, dry, remove and recover the ethanol. The resulting mixture containing Li, Ni, and Co is placed in oxygen-enriched air and at a proper temperature. (350~500℃), pre-fired for 2-10h, after taking out and grinding, sintering in oxygen-enriched air or pure oxygen atmosphere and at the appropriate temperature (650~900℃) for 10-16h, taking out and grinding and sieving , Take the product between 1~25μm to get LiNi 0.8 Co 0.2 O 2 Matrix cathode material. XRD and electrochemical performance tests were performed on the material.

[0042] 1.0molLiNi 0.8 Co 0.2 O 2 About 98.0g of the parent cathode material, disperse in an appropriate amount of deionized water, and stir to obtain a uniform suspension A; dissolve the prop...

Example Embodiment

[0044] Example 2

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

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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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