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A kind of lithium-ion power battery composite negative electrode material and preparation method thereof

A power battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of electrode pulverization and poor cycle performance, and achieve the effects of preventing agglomeration, stable rate performance cycle, and narrow particle size distribution

Active Publication Date: 2019-08-27
LINKDATA NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, when lithium metal is used as the negative electrode material of lithium-ion power batteries, there is a problem of poor cycle performance, and the negative electrode material will experience large volume changes during repeated cycles. When storing a large amount of lithium, the volume can be reduced. Expanding to several times the original size, it is easy to cause problems such as electrode pulverization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Preparation of composite negative electrode material for lithium-ion power battery

[0017] (1) Mix cinnamon acid, acetic acid, and malonic acid at an addition ratio of 5.8:2.5:1:4.2, stir and react at 140°C for 2.5 hours, keep a constant temperature state, and add to the above mixed solution at a rate of 4g / s After adding polyacrylate to the reaction for 1.5 hours, the average molecular weight was 2.8×10 4 Polyacrylate graft modified cinnamic acid;

[0018] (2) In a strong reducing atmosphere, 0.3mol titanium hydroxide, 0.4mol lithium carbonate, 0.3mol GaSO 4 , mixed with 0.025mol carbon nanotubes, and placed in 100ml aqueous solution for hydrothermal reaction, the hydrothermal reaction temperature is 120-200°C, the reaction time is 2-3h, the reaction pressure is 100MPa, and the carbon nanotubes / Li 4 Ti 2.75 Ga 3 o 12 ;

[0019] (3) Combine carbon nanotubes / Li 4 Ti 2.75 Ga 3 o 12 Placed in a reducing atmosphere for calcination, the calcination temp...

Embodiment 2

[0021] Example 2: Preparation of composite negative electrode material for lithium-ion power battery

[0022] (1) Mix cinnamon acid, acetic acid, and malonic acid in a ratio of 5.5:3:1:4, stir and react at 150°C for 2 hours, keep a constant temperature, and add to the above mixed solution at a dropping rate of 5g / s Add polyacrylate to the mixture, and react for 1 hour to obtain an average molecular weight of 8.5×10 4 Polyacrylate graft modified cinnamic acid;

[0023] (2) In a strong reducing atmosphere, mix 0.35mol titanium hydroxide, 0.4mol lithium carbonate, 0.2mol chromium carbonate and 0.02mol carbon nanotubes, and place them in 100ml aqueous solution for hydrothermal reaction. The hydrothermal reaction temperature is 120°C, reaction time is 3h, reaction pressure is 100MPa, carbon nanotubes / Li 4 Ti 3.5 Cr 2 o 12 ;

[0024] (3) Combine carbon nanotubes / Li 4 Ti 3.5 Cr 2 o 12 Placed in a reducing atmosphere for calcination, the calcination temperature is 300°C, and...

Embodiment 3

[0026] Example 3: Preparation of composite negative electrode material for lithium-ion power battery

[0027] (1) Mix cinnamon acid, acetic acid, and malonic acid at a ratio of 5.6:2:1:5, stir and react at 130°C for 3 hours, keep a constant temperature, and add to the above mixed solution at a rate of 2g / s. After adding polyacrylate to the reaction for 2 hours, the average molecular weight was 4.2×10 4 Polyacrylate graft modified cinnamic acid;

[0028] (2) In a strong reducing atmosphere, mix 0.2mol titanium hydroxide, 0.4mol lithium carbonate, 0.4mol basic cobalt carbonate and 0.05mol carbon nanotubes, and place them in 100ml aqueous solution for hydrothermal reaction, hydrothermal reaction The temperature is 200°C, the reaction time is 2h, and the reaction pressure is 100MPa, and the carbon nanotubes / Li 4 Ti 2 co 4 o 12 ;

[0029] (3) Combine carbon nanotubes / Li 4 Ti 2 co 4 o 12 Placed in a reducing atmosphere for calcination, the calcination temperature is 450°C,...

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PUM

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion power battery composite anode material and preparation method thereof. The anode material is obtained by wrapping a lithium composite active substance with an adhesive, the adhesive is graft modified cinnamic acid, the lithium composite active substance is carbon nanotube / Li4Ti5-0.75XMXO12, and M is at least one of Ga, Cr and Co. By the provided lithium ion power battery composite anode material, the safety of the battery can be improved, and the high-rate circulating property of the battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion power battery composite negative electrode material and a preparation method thereof. Background technique [0002] At present, lithium-ion power batteries with metal lithium as the negative electrode of the battery have been widely used in electronic devices such as mobile phones and cameras. Due to the advantages of high voltage, light weight, long life, no pollution, and low hidden dangers, lithium-ion power The scope of use of batteries is gradually expanding. As one of the four major components of lithium batteries, the anode material plays an important role in improving the capacity and cycle performance of the battery. In the prior art, when lithium metal is used as the negative electrode material of lithium-ion power batteries, there is a problem of poor cycle performance, and the negative electrode material will experience large v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/583H01M4/62H01M10/0525
CPCH01M4/364H01M4/485H01M4/583H01M4/621H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner LINKDATA NEW ENERGY CO LTD
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