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Preparation method of lithium ion battery nanocrystalline lithium titanate anode material

A lithium-ion battery, crystalline lithium titanate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of uneven particle size distribution, poor electrochemical activity, long sintering time, etc. The effect of short time and short diffusion distance

Inactive Publication Date: 2012-05-23
JIANGSU ZHIHANG NEW ENERGY
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  • Application Information

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Problems solved by technology

[0003] The purpose of the invention is to solve the problems of high synthesis temperature, long sintering time, uneven particle size distribution and poor electrochemical activity of the existing method for preparing lithium titanate, and to provide a lithium ion battery nanocrystalline titanate Preparation method of lithium anode material

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  • Preparation method of lithium ion battery nanocrystalline lithium titanate anode material
  • Preparation method of lithium ion battery nanocrystalline lithium titanate anode material

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specific Embodiment approach 1

[0008] Embodiment 1: The preparation method of the nanocrystalline lithium titanate anode material of lithium ion battery in this embodiment is as follows: 1. Dissolve 2.4 to 2.8 g of lithium acetate in a mixed solution of 20 ml of ethanol and water, and stir for 10 min to obtain liquid A , the volume ratio of ethanol to water in the mixture of ethanol and water is 3:1; 2. Add 2ml of concentrated nitric acid or 2ml of concentrated hydrochloric acid to 8.8-10ml of tetrabutyl titanate and 20ml of absolute ethanol, and then stir under strong magnetic Add 3g ~ 4.25g block copolymer under the condition of strong magnetic stirring to form a uniform phase, and then add 4ml concentrated nitric acid or 4ml concentrated hydrochloric acid in four times to obtain B liquid; 3. Under the condition of strong magnetic stirring, mix A liquid and B liquid mixed with liquid, let stand for 10 minutes, continue to stir for 5-10 minutes, and then incubate for 48-72 hours at a temperature of 40°C and...

specific Embodiment approach 2

[0009] Embodiment 2: This embodiment differs from Embodiment 1 in that step 1 dissolves 2.5 g of lithium acetate or 2 g of lithium hydroxide in a mixed solution of 20 ml of ethanol and water. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0010] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in step 2, 9ml of tetrabutyl titanate or 10ml of titanium isopropoxide is added dropwise to 20ml of absolute ethanol. Others are the same as in the first embodiment.

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Abstract

The invention provides a preparation method of lithium ion battery nanocrystalline lithium titanate anode material, relating to a preparation method of anode. The invention overcomes the defects that synthesis temperature of the existing lithium titanate preparation method is high, sintering time is long, particle size distribution of product is nonuniform and electrochemical activity is poor. The method includes that: firstly, raw material is weighed; secondly, solution A is prepared; thirdly, solution B is prepared; fourthly, the solution A and the solution B are mixed to form transparent gel, then the gel is dried, grinding is carried out for 12 hours, sintering is carried out for 12 hours at 700 DEG C, and sieving by a 400-meshes sieve is carried out, thus obtaining lithium titanate nanocrystalline. The synthesis temperature of lithium titanate preparation method of the invention is low, reaction time is short, particle of lithium titanate is tiny, particle size is between 120nm and 140nm, and the preparation method has the prominent uniformity and high electrochemical activity.

Description

technical field [0001] The invention relates to a method for preparing an anode. Background technique [0002] Spinel Li 4 Ti 5 o 12 Due to its good cycle performance, outstanding safety performance, small volume change and low cost in the process of intercalating lithium, it has become a current research hotspot, and is listed as the negative electrode material of the second-generation lithium-ion power battery by the US Department of Energy. However, as a negative electrode material for lithium-ion batteries, spinel-type lithium titanate has poor conductivity (the intrinsic conductivity is ), and the high-current discharge performance is poor, which seriously hinders the application of spinel lithium titanate. Usually the preparation method plays a key role in the final performance of the material, spinel lithium titanate (Li 4 Ti 5 o 12 ) traditional preparation methods mainly include high-temperature solid-state reaction method and sol-gel method. Among them, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/485
CPCY02E60/122Y02E60/10
Inventor 张乃庆柳志民孙克宁李伟廖成龙杨同勇
Owner JIANGSU ZHIHANG NEW ENERGY
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