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Lithium ion battery composite positive pole material and preparation method thereof

A composite positive electrode material and lithium-ion battery technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that the increase in capacity is not very effective, and achieve improved charge and discharge capacity, improved conductivity, and high battery capacity. The effect of chemical activity

Inactive Publication Date: 2018-10-23
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above composite coating method does not have a very good effect on the capacity increase.

Method used

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  • Lithium ion battery composite positive pole material and preparation method thereof
  • Lithium ion battery composite positive pole material and preparation method thereof
  • Lithium ion battery composite positive pole material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The bulk cathode material is LiNi with a median particle size of about 10 μm 0.6 co 0.2 mn 0.2 o 2 , which is the sample before improvement, such as figure 1 shown.

[0036] 1mol of LiNi 0.6 co 0.2 mn 0.2 o 2 After preliminary grinding with 0.08mol lithium hydroxide, 0.085mol nickel acetate, 0.015mol cobalt acetate and 0.002mol lithium fluoride, 15mL ethanol was added for wet ball milling. The resulting mixture was dried in an oven at 120°C and calcined at 700°C in oxygen for 5 hours to obtain LiNi 0.6 co 0.2 mn 0.2 o 2 and Li 0.82 Ni 0.85 co 0.15 o 1.99 f 0.02 A composite positive electrode material, wherein the mass fraction of the high-nickel lithium-containing oxide in the composite material is about 9%, and the particle size of the high-nickel lithium-containing oxide is less than 100nm. Such as figure 2As shown, the spherical particles in the figure are the improved morphology, and the small particles on the surface are the morphology of the hig...

Embodiment 2

[0042] Following Example 1, except that lithium fluoride is not added, the amount of lithium hydroxide added is changed to 0.082mol, and the chemical formula of the high-nickel lithium-containing oxide in the obtained compound is Li 0.82 Ni 0.85 co 0.15 o 2 . The obtained composite material was assembled into a half-battery as a working electrode, and the battery was charged and discharged. The voltage range was 2.8-4.25V. The charge-discharge curve in the first week was tested at 0.1C / 0.1C, and the cycle capacity retention rate was tested at 1C / 1C.

Embodiment 3

[0044] Follow Example 1, just change the amount of lithium hydroxide added to 0.072mol, and the amount of lithium fluoride to 0.01mol, and the chemical formula of the high-nickel lithium-containing oxide in the obtained compound is Li 0.82 Ni 0.85 co 0.15 o 1.95 f 0.1 . The obtained composite material was assembled into a half-battery as a working electrode, and the battery was charged and discharged. The voltage range was 2.8-4.25V. The charge-discharge curve in the first week was tested at 0.1C / 0.1C, and the cycle capacity retention rate was tested at 1C / 1C.

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Abstract

The invention provides a lithium ion battery composite positive pole material. The lithium ion battery composite positive pole material comprises a main body positive pole material and a high nickel lithium-containing oxide. The invention also provides a preparation method of the lithium ion battery composite positive pole material. The preparation method comprises preliminarily grinding and mixing a lithium source, a nickel source, an M' source, a fluorine source and the main body positive pole material according to a mole ratio of Li: Ni: M': F of (0.5-1.2): (1-b): b: (0-0.1) and b is greater than or equal to 0 and less than or equal to 0.4, adding a liquid agent into the mixture, carrying out wet ball milling to obtain a uniform mixture, drying the mixture at 50-200 DEG C and sinteringthe mixture in an oxygen atmosphere at 400-1000 DEG C for 2-15h to obtain the lithium ion battery composite positive pole material containing the main body positive pole material and high nickel lithium-containing oxide.

Description

technical field [0001] The invention belongs to the technical field of lithium battery positive electrode materials, and in particular relates to a lithium ion battery composite positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices, electric vehicles and other fields due to their high energy density, long cycle life, low self-discharge rate, high operating voltage, and no memory effect. Focusing on different usage characteristics, each application field has basically formed a corresponding cathode material system to match it. [0003] The current commercial cathode materials mainly include lithium cobaltate, lithium manganese oxide, lithium iron phosphate and ternary material systems. However, with more and more applications, the capacity of these cathode materials is difficult to meet the application requirements. In addition to the continuous development of new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 张振宇王骞申兰耀沈伟王胜彬高川周恒辉
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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