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Preparation method of high-rate copper-doped lithium titanate negative electrode material

A technology of heterolithic lithium titanate and negative electrode materials, which is applied in the field of copper-doped lithium titanate negative electrode materials, can solve the problems of complex preparation methods, unstable samples, and inability to change the internal structure of electrodes, and achieve low calcination temperature and short time , the effect of saving energy

Inactive Publication Date: 2016-08-31
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Surface modification is conducive to the formation of a coating layer on the surface, which is helpful to improve the conductivity, safety and stability of the material, but it cannot change the internal structure of the electrode
Compounding is usually mixed with high specific capacity substances in proportion, but the prepared samples are unstable and the preparation method is complicated

Method used

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  • Preparation method of high-rate copper-doped lithium titanate negative electrode material
  • Preparation method of high-rate copper-doped lithium titanate negative electrode material
  • Preparation method of high-rate copper-doped lithium titanate negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0021] x=0.05, y=0 molecular formula is: Li 3.95 Ti 5 Cu 0.05 o 12 , its preparation process is:

[0022] Weigh 2.08g of lithium acetate into a flask containing 30ml of ethanol, add 13.06g of butyl titanate, 0.096g of copper sulfate pentahydrate, and 1.85g of anhydrous oxalic acid in sequence, and stir for 6 hours to form a blue transparent sol, then let it stand for 24 hours Gel is formed, after grinding, it is pre-calcined in a muffle furnace at 500°C for 2 hours, then calcined at 800°C for 10 hours, cooled to room temperature, and ground to obtain a copper-doped lithium titanate product.

Embodiment 2

[0024] x=0.1, y=0.1, the molecular formula is: Li 3.9 Ti 4.9 Cu 0.2 o 12 , its preparation process is:

[0025] Weigh 2.17g of lithium nitrate and place it into a flask containing 30ml of ethanol, add 12.96g of butyl titanate, 0.38g of copper nitrate trihydrate, and 1.65g of anhydrous oxalic acid in sequence, and stir for 6 hours to form a blue transparent sol, then let it stand for 24 hours Gel is formed, after grinding, it is pre-calcined in a muffle furnace at 500°C for 2 hours, then calcined at 800°C for 10 hours, cooled to room temperature, and ground to obtain a copper-doped lithium titanate product.

Embodiment 3

[0027] x=0., y=0.15, the molecular formula is: Li 4 Ti 5 Cu 0.1 5O 12 , its preparation process is:

[0028] Weigh 2.33g of lithium carbonate and place it into a flask containing 30ml of ethanol, add 12.51g of butyl titanate, 0.275g of copper nitrate trihydrate, and 0.52g of CTAB in sequence, and stir for 6 hours to form a blue transparent sol, then let it stand for 24 hours to form a gel After grinding, place it in a muffle furnace for pre-calcination at 500°C for 2h, then calcinate in a reducing atmosphere at 800°C for 10h, cool to room temperature, and grind to obtain the copper-doped lithium titanate product.

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Abstract

The invention relates to a preparation method of a negative electrode material for a lithium-ion battery, in particular to a preparation method of a copper-doped lithium titanate negative electrode material. The preparation method comprises the following steps: sequentially adding a lithium source, a titanium source, a copper source and a chelating agent to an organic solvent for mixing, stirring and dissolving; taking out the mixture for standing after 6 hours, forming gel and drying the gel at 100 DEG C for 10 hours to obtain a precursor; and presintering the precursor in a muffle furnace at a constant temperature of 500 DEG C for 2 hours, burning the product at 800 DEG C for 10 hours, cooling the product to a room temperature and grinding the product. The copper-doped lithium titanate sample prepared by the method is fine and uniform in particle; the average particle size is 200-400nm; the degree of crystallinity is good; and the purity is high. The conductivity of lithium titanate is effectively improved by copper doping; and the electronic conductivity and the lithium-ion diffusion rate are improved, so that the rate capability is improved; and the preparation method has very great applicability to the negative electrode material for a power battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery electrode material production, and in particular relates to a copper-doped lithium titanate negative electrode material. Background technique [0002] At present, the application range of lithium-ion batteries is undergoing profound changes, from the original electronic consumption field to the power battery and energy storage field. On the one hand, due to the inherent reasons such as the continuous consumption of fossil fuels and their non-renewability, their expected costs will continue to rise, and due to the growing demand for environmental protection, people are eager to have safer, healthier and more sustainable fuels. On the other hand, the demand for lithium-ion batteries in the field of consumer electronics is slowing down. As a chemical energy source, lithium-ion batteries urgently need to expand their scope of application. At the same time, the accumulated production and sc...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M10/0525
CPCH01M4/485H01M10/0525Y02E60/10
Inventor 徐卡秋刘瑞龙曾珍
Owner SICHUAN UNIV
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