Surface modified lithium ion battery anode material and preparation method thereof

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complex process, high cost, unfavorable large-scale industrial production, etc., and achieves simple process flow, low cost, and good high rate. performance effect

Inactive Publication Date: 2015-05-06
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing surface modification methods usually use the sol-gel method (such as CN201310010611) or the magnetron sputtering method (such as CN200710119818), the process used is complicated and the cost is high, which is not conducive to large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing a surface-modified layered lithium cobaltate material: Weigh 100.0g of lithium cobaltate LiCoO 2 With 8.8232g magnesium acetate C 4 h 6 o 4 Mg·4H 2 O was mixed evenly, and then treated in the air at 80°C for 4h, and then continued to be treated in the air at 600°C for 0.5h, and a lithium cobalt oxide material with a surface modification of 1% Mg element mass fraction was obtained. Weigh the active material lithium cobalt oxide, the conductive agent carbon black and the binder PVDF at a mass ratio of 84:8:8, grind and mix them evenly, and then coat them to make a positive electrode. Use a lithium sheet as the counter electrode and use lithium hexafluorophosphate as the solute , Ethyl carbonate + diethyl carbonate (volume ratio 1:1) as the solvent, the electrolyte solution with a concentration of 1mol / L, and the separator is a polypropylene microporous film, assembled into a CR2016 button battery for electrochemical performance testing.

[0024]...

Embodiment 2

[0026] Preparation of a surface-modified layered lithium-nickel-cobalt-manganese-oxygen ternary material: 6.7139g zinc acetate C 4 h 6 o 4 Zn·2H 2 O with 100gLiNi 0.5 co 0.2 mn 0.3 o 2 After mixing evenly, treat at 100°C in air for 10h, and then continue to treat at 300°C for 8h to obtain a surface-modified ternary material with a mass fraction of Zn element of 2%. Subsequent electrode preparation and half-cell preparation processes are the same as in Example 1.

[0027] The layered lithium-nickel-cobalt-manganese-oxygen ternary material modified by surface modification according to Example 2 is cycled 100 times at 1C at room temperature, and its capacity retention rate is 98.9% when the charge-discharge interval is 2.0-4.3V, and the charge-discharge interval is The capacity retention rate is 93.4% at 2.0-4.4V. As a comparison, the ternary materials without surface modification were cycled 100 times at 1C, and their capacity retentions were 91.2% and 80.7%, respectivel...

Embodiment 3

[0029] Preparation of a surface-modified spinel-type lithium manganate material: 12.6794g cobalt acetate C 4 h 6 o 4 Co 4H 2 O with 100gLiNi 0.5 co 0.2 mn 0.3 o 2 After uniform mixing, treat in the air at 300°C for 5h, and continue to treat at 500°C for 4h to obtain a surface-modified lithium manganate material with a mass fraction of Co element of 3%. Subsequent electrode preparation and half-cell preparation processes are the same as in Example 1.

[0030] When the charge-discharge range is 3.0-4.3V, the spinel-type lithium manganate material modified by surface modification according to Example 3 has a capacity retention rate of 98.4% after 100 cycles at 1C at room temperature, and 100 cycles at 1C at a high temperature of 55°C. Second, the capacity retention rate is 95.8%. As a comparison, the capacity retention rates of lithium manganate materials without surface modification after 100 cycles of 1C at room temperature and 55 °C were 93.1% and 82.5%, respectively. ...

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PUM

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Abstract

The invention discloses a surface modified lithium ion battery anode material and a preparation method thereof. The preparation method comprises the following steps: (1) fully mixing a lithium ion battery anode material with one or more types of metal acetates; (2) heating the mixture obtained in the step (1) to a temperature 1 to ensure that the low-melting-point acetate in the mixture reaches a molten or co-molten state, and complete infiltration and complete coating are realized on the surface of the anode material; and (3) further heating to a temperature 2 to ensure that the metal acetate coating layer on the surface of the anode material is decomposed into a metal oxide coating layer and metal ions are diffused to the inside of the material to form a doped modified layer, thereby obtaining the surface modified lithium ion battery anode material. According to the preparation method disclosed by the invention, the melting and uniform coating of the metal acetates on the surface of the anode material are realized, the metal acetate coating layer is decomposed and converted into the oxide coating layer and is diffused to form the surface doped modified layer, the process is simple, the cost is relatively low, and the operation is convenient.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a surface-modified lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion battery technology has made great progress since Japan's Sony Corporation successfully produced commercial lithium-ion batteries in 1991. Due to its high energy density, high power density, long cycle life, no pollution and low self-discharge rate, the application field of lithium-ion batteries has gradually expanded to power tools, electric vehicles, Emerging fields such as energy storage power stations, and have extremely broad application prospects. [0003] Cathode material is the most critical component of lithium-ion batteries. It is the source of Li+ in lithium-ion batteries, directly determines its energy density, and is also an important factor affecting battery power density, cycle life and safety performance. During the charg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/366H01M4/505H01M4/525Y02E60/10
Inventor 丁楚雄王壮
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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