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Cobalt titanium blue coated lithium titanate and preparation method thereof

A technology of green-coated lithium titanate and lithium titanate, which is applied in the field of lithium-ion secondary battery anode materials, can solve problems such as gas generation and impact on applications, and achieve the effects of preventing side reactions, inhibiting battery swelling, and stabilizing the structure

Active Publication Date: 2016-10-26
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the lithium titanate material will react with the electrolyte to generate gas, which affects its practical application

Method used

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  • Cobalt titanium blue coated lithium titanate and preparation method thereof
  • Cobalt titanium blue coated lithium titanate and preparation method thereof

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preparation example Construction

[0020] Such as figure 1 Shown, the preparation method of cobalt titanium green coated lithium titanate of the present invention comprises the following steps:

[0021] 1) Weigh lithium salt and titanium dioxide according to the molar ratio of lithium and titanium (0.78~0.84):1, and then weigh deionized water according to the mass ratio of deionized water to (titanium dioxide+lithium salt) as 3:1, and The above-mentioned substances are added into a sand mill for ball milling, and the particle size of the ball mill slurry is D 50 ≤0.2μm;

[0022] 2) Microwave drying the slurry obtained in step 1) at a drying temperature of 110-120°C;

[0023] 3) Roasting the material obtained in step 2) once at 700-900° C. for 8-24 hours to obtain a lithium titanate material;

[0024] 4) Weigh titanium dioxide and cobalt compounds according to the titanium and cobalt molar ratio of 1:2, wherein the quality of titanium dioxide: step 3) lithium titanate quality = 0.1% ~ 0.5%: 1, then according ...

Embodiment 1

[0033] A preparation method of cobalt titanium green coated lithium titanate, comprising the steps of:

[0034] 1) Weigh lithium carbonate and titanium dioxide according to the molar ratio of lithium and titanium of 0.78:1, then weigh deionized water according to the mass ratio of deionized water to (titanium dioxide+lithium carbonate) as 3:1, and add the above-mentioned substances to sand Ball milling in the mill, ball milling slurry particle size D 50 = 0.18 μm;

[0035] 2) The slurry obtained in step 1) is subjected to microwave drying, and the drying temperature is 110° C.;

[0036] 3) Roasting the material obtained in step 2) once at 700° C. for 24 hours to obtain a lithium titanate material;

[0037] 4) Weigh titanium dioxide and cobalt tetraoxide according to the molar ratio of titanium and cobalt being 1:2, wherein the quality of titanium dioxide: step 3) lithium titanate quality = 0.1%: 1, and then according to deionized water and (titanium dioxide+cobalt tetroxide+...

Embodiment 2

[0044] A preparation method of cobalt titanium green coated lithium titanate, comprising the steps of:

[0045] 1) Take lithium hydroxide monohydrate and titanium dioxide according to the molar ratio of lithium and titanium being 0.80:1, then weigh deionized water according to the mass ratio of deionized water and (titanium dioxide+lithium hydroxide) as 3:1, and The above-mentioned substances are added into a sand mill for ball milling, and the particle size of the ball mill slurry is D 50 = 0.15 μm;

[0046] 2) The slurry obtained in step 1) is subjected to microwave drying, and the drying temperature is 110° C.;

[0047] 3) Roasting the material obtained in step 2) once at 900° C. for 8 hours to obtain a lithium titanate material;

[0048] 4) Weigh titanium dioxide and cobalt oxalate according to the molar ratio of titanium and cobalt being 1:2, wherein the quality of titanium dioxide: step 3) lithium titanate quality = 0.1%: 1, then according to deionized water and (titaniu...

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Abstract

The invention discloses cobalt titanium blue coated lithium titanate and a preparation method thereof. The preparation method includes following steps: obtaining a pure-phase lithium titanate material through first-time of high-temperature solid-phase reaction; adding titanium dioxide and a cobalt compound; obtaining a cobalt titanium blue coated lithium titanate material through second-time solid-phase reaction. The cobalt titanium blue material has the advantages of structural stability and corrosion resistance and can effectively block side effect between lithium titanate and electrolyte. Cycling performance and bloating performance of the lithium titanate material obtained by the method are improved substantially.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium-ion secondary batteries, in particular to a cobalt-titanium green-coated lithium titanate and a preparation method thereof. Background technique [0002] Lithium-ion battery, as a new type of secondary chemical battery with high specific energy and green environmental protection, has been attracting attention from all sides since its appearance. With the development of new lithium-ion battery materials and large-capacity manufacturing technology in the past two or three years, the application of lithium-ion power batteries in HEVs has become possible, and it is also the mainstream of research and development of various types of HEV electric systems. Although the application technology of lithium-ion power batteries in HEVs has made great progress, the new PHEV technology puts forward higher requirements for the fast charging performance, rate discharge performance and safety...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M4/485H01M4/628H01M10/0525Y02E60/10
Inventor 徐宁宋英杰伏萍萍马倩倩
Owner TIANJIN B&M SCI & TECH
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