Method for preparing lithium ion battery negative electrode material lithium titanate

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of high energy consumption in the preparation of high-energy ball milling, difficulty in large-scale industrialization, and difficult control of product morphology. Good electrochemical performance, easy industrial production, and moderate conditions

Inactive Publication Date: 2015-06-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the solid-phase method is simple to operate, there are also incomplete reactions, high temperature and long-term heat treatment are required, and product morphology is difficult to control.
The preparation of high energy ball milling method consumes a lot of energy
The cost of the sol-gel method increases due to the addition of organic compounds, and the process is complicated, making it difficult to achieve large-scale industrialization

Method used

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  • Method for preparing lithium ion battery negative electrode material lithium titanate
  • Method for preparing lithium ion battery negative electrode material lithium titanate
  • Method for preparing lithium ion battery negative electrode material lithium titanate

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 1) Slowly drop a lithium oxalate solution with a lithium ion concentration of 0.5 to 1 mol / L into tetrabutyl titanate, so that the molar ratio of Li to Ti in the emulsion is: n(Li / Ti)=0.75:1, Stir thoroughly to obtain an emulsion;

[0022] 2) put the emulsion into an oven for reaction, the temperature of the oven is 80°C, and after 12 hours, the product that has become solid is taken out from the oven;

[0023] 3) After grinding the product, heat treatment is carried out at 600° C. for 3 hours to obtain the final product.

[0024] see Figure 1~3 ,From figure 1 It can be seen that the diffraction peaks of the prepared product are very sharp and have high intensity, and there are no other impurity phases, indicating that the product is a pure phase lithium titanate. From figure 2 It can be seen that the prepared lithium titanate is nano-scale small particles and presents a loose structure. The electrode material of this type of structure is conducive to the intercal...

Embodiment 2

[0026] 1) Slowly drop a lithium ion concentration of 2 to 4mol / L lithium acetate solution into tetrabutyl titanate, so that the molar ratio of Li to Ti in the emulsion is: n(Li / Ti)=0.85:1, fully Stir to make an emulsion;

[0027] 2) put the emulsion into an oven for reaction, the temperature of the oven is 70°C, and after 5 hours, the product that has become solid is taken out from the oven;

[0028] 3) After the product is ground, it is heat-treated at 1000° C. for 8 hours to obtain the final product.

Embodiment 3

[0030] 1) Slowly drop a lithium hydroxide solution with a lithium ion concentration of 1 to 4mol / L into tetrabutyl titanate, so that the molar ratio of Li to Ti in the emulsion is: n(Li / Ti)=1.2:1, Stir thoroughly to obtain an emulsion;

[0031] 2) put the emulsion into an oven for reaction, the temperature of the oven is 100°C, and after 8 hours, the product that has become solid is taken out from the oven;

[0032] 3) After the product is ground, it is heat-treated at 800° C. for 6 hours to obtain the final product.

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Abstract

The invention discloses a method for preparing a lithium ion battery negative electrode material lithium titanate, belonging to the technical field of battery electrode materials. The method comprises the following steps: (1) dripping a lithium-containing solution into a tetrabutyl titanate solution, fully and uniformly stirring, thereby obtaining emulsion; (2) adding the emulsion into a drying box to react until the emulsion becomes a solid-state product; and (3) grinding the solid-state product prepared in the step (2), and performing heat treatment, thereby obtaining the lithium ion battery negative electrode material lithium titanate. According to the method disclosed by the invention, the preparation process is simple in process, the conditions are moderate, special process equipment is not needed, and industrial production is easily realized. The lithium titanate material prepared by the method disclosed by the invention is high in purity and high in crystallinity and can reach the nanoscale, the lithium ion diffusion path is effectively shortened by the material, the rate performance is improved, and the material has good electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of battery electrode materials, and in particular relates to a preparation method of lithium titanate, a negative electrode material of a lithium ion battery. Background technique [0002] Lithium-ion secondary batteries have developed rapidly since their appearance at the end of the last century, and have attracted the attention of many well-known companies, and vigorously researched and developed them into commercial production. At present, they have a certain proportion of applications in the field of electric vehicles. Lithium-ion batteries have great commercial prospects in civilian products such as electric vehicles and electric bicycles, and also have significant applications in the aerospace field. This requires the battery to have high reliability and low-temperature working performance, and also requires the battery to have a long cycle life, high energy density, and small volume and mass. Spinel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00H01M4/485
CPCY02E60/10
Inventor 黄剑锋张婉卓惠亚妮曹丽云许占位李嘉胤欧阳海波李翠艳
Owner SHAANXI UNIV OF SCI & TECH
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