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Li4Ti5O12 cathode material cladden on surface of spinel LiMn2O4 and preparation method thereof

A technology of surface coating and electrode materials, which is applied in the direction of electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve problems affecting electrochemical performance, etc., and achieve low price, simple coating process, and good safety performance

Inactive Publication Date: 2005-11-09
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above coatings, except LiCoO 2 With a high chemical diffusion coefficient, except for electronic conductivity, other coating materials have deficiencies, which in turn affect the LiMn 2 o 4 electrochemical performance

Method used

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  • Li4Ti5O12 cathode material cladden on surface of spinel LiMn2O4 and preparation method thereof
  • Li4Ti5O12 cathode material cladden on surface of spinel LiMn2O4 and preparation method thereof
  • Li4Ti5O12 cathode material cladden on surface of spinel LiMn2O4 and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 0.2303g of lithium acetate into a mixed solution of 2ml of absolute ethanol, 0.25ml of deionized water, and 0.2ml of glacial acetic acid under stirring. After lithium acetate is completely dissolved, slowly transfer it to 0.9701g of butyl titanate solution under stirring. A pale yellow transparent sol was formed, and after stirring for 30 minutes, 10 g LiMn was added 2 o 4 Powder, continue to stir for 4 hours, the sol gradually turns into a gel, and the gel is dried in an oven at 150°C overnight to become a dry gel powder, which is directly sintered in a muffle furnace at 800°C for 24 hours , naturally lowered to room temperature, 1% molLi 4 Ti 5 o 12 Coated LiMn 2 o 4 powder.

Embodiment 2

[0024] Add 0.2326g of lithium acetate into a mixed solution of 3ml of absolute ethanol, 0.28ml of deionized water, and 0.25ml of glacial acetic acid under stirring. After the lithium acetate is completely dissolved, slowly transfer it to 0.9800g of butyl titanate solution under stirring. A pale yellow transparent sol was formed, and after stirring for 30 minutes, 5gLiMn was added 2 o 4 Powder, continue to stir for 4 hours, the sol gradually turns into a gel, put the gel in an oven at 150°C and dry overnight to become dry gel powder, and sinter the dry gel powder directly in a muffle furnace at 800°C for 24 hours , naturally lowered to room temperature, 2% molLi 4 Ti 5 o 12 Coated LiMn 2 o 4 powder.

Embodiment 3

[0026]Add 0.2115g of lithium acetate into a mixed solution of 3.1ml of absolute ethanol, 0.23ml of deionized water, and 0.2ml of glacial acetic acid under stirring. After lithium acetate is completely dissolved, slowly transfer it to 0.8911g of butyl titanate solution under stirring , forming a light yellow transparent sol, after stirring for 30 minutes, adding 3gLiMn 2 o 4 Powder, continue to stir for 4 hours, the sol gradually turns into a gel, and the gel is dried in an oven at 150°C overnight to become a dry gel powder, which is directly sintered in a muffle furnace at 800°C for 24 hours , naturally lowered to room temperature, 3% molLi 4 Ti 5 o 12 Coated LiMn 2 o 4 powder.

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PUM

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Abstract

This invention relates to a preparing method for coating Li4 Tis O12 on the surface of Li Mn2 O4. A compound with Li and Ti is mixed under the action of a gel for a period of time, then mixed again to become a dry gel, which is baked under 10-250 deg. C for 1-24 hours to become a predecessor to be sintered for 5-24 h under 300-900deg.C to get a LiMn2O4 electrode material with different coated contents. Since this invention considers the 'zero strain' structure of Li4 Ti5 O12 and utilizes its rather high Li diffusion factor, the volume loss resulted from the dissolution of LiMn2O4 is reduced, which not only increases the circulation performance of LiMn2O4, but also influences very little in the process of 10C large current charge and discharge.

Description

technical field [0001] The invention belongs to a modified lithium ion battery cathode active material, in particular to coating Li on the surface 4 Ti 5 o 12 LiMn 2 o 4 and its preparation method. Background technique [0002] Since the advent of lithium-ion batteries in 1991, their cathode materials have been a research hotspot. The cathode material that has been commercially applied at present is layered LiCoO 2 , although it has the advantages of high open circuit voltage, large specific energy, long cycle life, and fast discharge, but it has problems such as high price and environmental pollution, so it is necessary to find a substitute for LiCoO 2 positive electrode material. Among them, LiMn with spinel structure 2 o 4 Has a higher operating voltage (about 3.9V vs. Li + / Li), low price, and environmental friendliness, so it is considered to be the most promising alternative to LiCoO 2 One of the preferred cathode materials. ...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 刘兴泉刘东强
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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