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Composite lithium titanate preparation method

A composite lithium titanate and lithium source technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as material cycle performance defects, improve the first Coulomb efficiency and cycle stability, high rate performance, improve The effect of high rate capability

Inactive Publication Date: 2016-03-16
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Li prepared by the above method 4 Ti 5 o 12 There are still some defects in the cycle performance of materials

Method used

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  • Composite lithium titanate preparation method

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Experimental program
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Effect test

Embodiment 1

[0019] The preparation method of composite lithium titanate comprises the following steps:

[0020] 1) Lithium carbonate, titanium dioxide and chromium oxide were mixed according to the Li:Ti:Cr molar ratio of 0.6:1:0.06, dispersed in an alcohol solvent for ball milling for 8 hours, and then sintered and dried at 80°C for 6 hours;

[0021] 2) heat-treat the dried product obtained in step 1) at 400° C. for 10 hours and then cool it naturally;

[0022] 3) The heat-treated material obtained in step 2) and glucose were mixed and ball-milled at 100:10 by weight for 10 hours, then sintered at 750° C. for 15 hours under nitrogen protection, and cooled through a 300-mesh sieve.

Embodiment 2

[0024] The preparation method of composite lithium titanate comprises the following steps:

[0025] 1) Lithium carbonate, titanium dioxide and zirconia were mixed according to the Li:Ti:Zr molar ratio of 0.8:1:0.1, dispersed in acetone solvent for ball milling for 12 hours, and then sintered at 90°C for 8 hours and dried;

[0026] 2) heat-treat the dried product obtained in step 1) at 500° C. for 18 hours and then cool it naturally;

[0027] 3) The heat-treated material obtained in step 2) and furfural resin were mixed and ball-milled for 10 hours at a ratio of 100:20 by weight, then sintered at 800° C. for 16 hours under nitrogen protection, and then cooled through a 300-mesh sieve.

Embodiment 3

[0029] The preparation method of composite lithium titanate comprises the following steps:

[0030] 1) Lithium nitrate, titanium tetrachloride and zinc oxide were mixed according to Li:Ti:Zn molar ratio of 1:1:0.2, dispersed in alcohol solvent for ball milling for 8 hours, then sintered at 100°C for 8 hours and dried;

[0031] 2) heat-treat the dried product obtained in step 1) at 600° C. for 20 hours and then cool it naturally;

[0032] 3) Mix and ball-mill the heat-treated material obtained in step 2) and asphalt at a ratio of 100:10 by weight for 12 hours, then sinter at 900° C. for 18 hours under nitrogen protection, and then cool through a 300-mesh sieve.

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Abstract

The invention relates to a composite lithium titanate preparation method, which comprises: 1) uniformly mixing a lithium source compound, a titanium source compound and the compound of a doped modifier M according to a molar ratio of Li to Ti to M of (0.6-1):1:(0.06-0.3), dispersing in an organic solvent, carrying out ball milling for 6-12 h, sintering for 6-12 h at a temperature of 80-120 DEG C, and drying; 2) carrying out a heat treatment on the dried product obtained in the step 1) for 8-20 h at a temperature of 400-600 DEG C, and naturally cooling; and 3) carrying out mixing ball milling on the treated material obtained in the step 2) and a cladding material for 6-12 h according to a weight ratio of 100:(5-20), sintering for 8-20 h at a temperature of 700-950 DEG C under the protection of nitrogen, cooling, and screening with a 300 mesh sieve. According to the present invention, the preparation method has characteristics of rapid reaction, high product purity, low cost, and easy large-scale industrial production achieving.

Description

technical field [0001] The invention belongs to the field of lithium battery materials, and in particular relates to a preparation method of composite lithium titanate. Background technique [0002] In recent years, the research and development of lithium-ion batteries have received extensive attention and attention around the world. The high specific energy, high voltage and low pollution characteristics of lithium-ion batteries make it a good power source for mobile phones, notebook computers and cameras, and it is also one of the important candidates for future electric vehicle power sources. Among the currently commercialized or partially commercialized metal oxide electrode materials for lithium-ion batteries, lithium-titanium composite oxides Li 4 Ti 5 o 12 It can be used as a negative electrode material for lithium-ion batteries and has a spinel structure. It was studied as a positive electrode material for lithium-ion batteries in the late 1980s, but because it ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62
CPCY02E60/10
Inventor 常敬杭徐云军程迪尹正中皮利苹赵甜余娇
Owner HENAN KELONG NEW ENERGY CO LTD
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