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Lithium ion battery material preparation method

A lithium-ion battery and carbon material technology, applied in the field of electrochemistry, can solve problems such as large polarization, low conductivity, and increased battery internal resistance and mass transfer resistance, and achieve the effect of reducing processing difficulty and high tap density

Inactive Publication Date: 2017-02-01
马鞍山首拓新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium titanate itself has a low conductivity (about 10-9S / cm), which significantly increases the internal resistance and mass transfer resistance of the battery during charge and discharge, resulting in greater polarization and reduced high-rate charge and discharge performance.

Method used

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  • Lithium ion battery material preparation method

Examples

Experimental program
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Effect test

example 1

[0029] Weigh titanium dioxide, lithium carbonate, respectively 20 kg and 7.96 kg, add 100 kg of pure water, mix and stir, carry out wet ball milling, ball milling time is 1 hour, then spray dry, under air atmosphere, the material obtained by spray drying Carry out sintering, the sintering temperature is 850° C., and the sintering time is 4 hours, and the semi-finished lithium titanate is prepared. Weigh semi-finished lithium titanate and carbon nanotubes, respectively 10 kg and 0.1 kg, and perform wet ball milling for 2 hours. Then spray dry, under nitrogen atmosphere, at 850 ℃ temperature, sinter for 6 hours, the tap density of preparation is 1.35g / cm 3 of lithium titanate.

[0030] figure 1 It is the scanning electron micrograph of the lithium titanate prepared in the embodiment of the present invention 1, from figure 1 It can be seen that the spherical effect of lithium titanate is better, and the spherical shape is tighter, which can effectively improve the tap density....

example 2

[0032] Weigh titanium dioxide, lithium hydroxide, respectively 10 kg and 2.58 kg, add 45 kg of pure water, mix and stir, carry out wet ball milling, ball milling time is 1 hour, then spray dry, under air atmosphere, spray dry the obtained The material is sintered, the sintering temperature is 800° C., and the sintering time is 6 hours, and the semi-finished lithium titanate is prepared. Weigh semi-finished lithium titanate and carbon nanotubes, respectively 10 kg and 0.2 kg, and perform wet ball milling for 5 hours. Then it was spray-dried and sintered for 8 hours at 800°C under a nitrogen atmosphere to obtain a tap density of 1.34g / cm 3 of lithium titanate.

[0033] figure 2 It is the scanning electron micrograph of the lithium titanate prepared in the embodiment 2 of the present invention, from figure 2 It can be seen that lithium titanate has a good ball forming effect, the spherical shape is regular, and the tap density of the material is high.

example 3

[0035] Weigh titanium dioxide and lithium carbonate, respectively 20 kg and 7.96 kg, add 100 kg of pure water, mix and stir, carry out wet ball milling, ball milling time is 0.5 hour, then spray dry, under air atmosphere, the material obtained by spray drying Carry out sintering, the sintering temperature is 900° C., and the sintering time is 4 hours, and the semi-finished lithium titanate is prepared. Weigh semi-finished lithium titanate and conductive carbon black, respectively 15 kg and 0.1 kg, and perform wet ball milling for 5 hours. Then it was spray dried, and sintered for 8 hours at 800°C under a nitrogen atmosphere to obtain a tap density of 1.38g / cm 3 of lithium titanate.

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Abstract

The present invention provides a lithium ion battery material preparation method, which comprises: preparing a semi-finished product lithium titanate, carrying out wet mixing on the semi-finished product lithium titanate and a carbon material, sequentially carrying out wet ball milling and spray drying, and sintering in an inert gas atmosphere. According to the present invention, the prepared lithium ion battery material has beneficial effects of high capacity, high tap density and excellent rate performance, and the method is suitable for large-scale production and application.

Description

technical field [0001] The invention relates to the field of electrochemical technology. More specifically, the present invention relates to a method for preparing lithium-ion battery materials with high tap density and high rate. Background technique [0002] At present, the various carbon materials used in the anode materials of lithium-ion batteries have a certain degree of volume expansion, safety hazards, and short cycle life, which cannot meet the requirements of long battery life, high stability, safety and environmental protection in the future. The development of a power battery material with high specific capacity, large rate, high cycle performance and high safety performance has become the research focus of scientific researchers. Compared with commercial lithium-ion battery anode carbon materials, the spinel-structured lithium titanate Li 4 Ti 5 o 12 It has cubic structure and "zero strain" performance, good dynamic performance and stability; high potential ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/364H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 张红涛
Owner 马鞍山首拓新能源科技有限公司
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