Method for preparing lithium-silicon alloy cathodes

A lithium-silicon alloy and negative electrode technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as unsuitability for large-scale production, poor conductivity of active materials, volume expansion/shrinkage, etc., to achieve strong lithium ion supply capacity and improve Effects of improving cycle life and safety

Inactive Publication Date: 2017-03-08
天津赫维科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these methods are not suitable for mass production and are costly
[0004] When lithium-silicon alloy is used as the negative electrode, the volume expands / shrinks severely during the charging and discharging process, which eventually leads to poor conductivity between the active materials and the end of life.

Method used

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  • Method for preparing lithium-silicon alloy cathodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In dry air with a relative humidity lower than 0.5%, 22.50 g of silicon powder (Tianjin Chemical Reagent Supply and Marketing Company) with a purity of 99.9% and 150 meshes and 1.39 grams of lithium powder with a purity of 99.99% and 150 meshes (Tianjin Zhongneng Lithium Industry Co., Ltd.) g into a 250ml ceramic grinding pot, add 10 corundum balls with a diameter of 5mm, fill with 99.999% argon gas to seal, install on a ball mill, and ball mill for 4 hours at a speed of 30 rpm, and take it out in a sandy shape. m 2 Filling density Filling area density 150g / m 2 1. In foamed nickel (Shandong Heze Tianyu Technology Co., Ltd.) with a thickness of 2 mm, it was heated to 160° C. under a pressure of 5 MPa and kept for 1 hour, then cooled to room temperature, and taken out to obtain a lithium-silicon alloy negative electrode. Punch out a disc with a diameter of 8.5 mm and a thickness of 0.4 mm for use.

[0016] In dry air with a relative humidity lower than 0.5%, take 50 mg ...

Embodiment 2

[0021] In dry air with a relative humidity lower than 0.5%, put 14.05g of silicon powder with a purity of 99.9% and 320 meshes and 3.47g of lithium powder with a purity of 99.99% and 320 meshes into a 250ml ceramic grinding pot, add 10 corundum balls with a diameter of 5mm, Fill it with 99.999% argon gas and seal it, install it on a ball mill, and ball mill it at a speed of 30 rpm for 4 hours until it becomes sandy and take it out at 800g / m 2 Filling density Filling area density 300g / m 2 1. In foamed nickel with a thickness of 3 mm, heat it to 170° C. under a pressure of 10 MPa and keep it for 1 hour, then cool down to room temperature, and take it out to obtain a lithium-silicon alloy negative electrode. Punch out a disc with a diameter of 8.5 mm and a thickness of 0.4 mm for use.

[0022] Manganese dioxide positive electrode sheet is made with embodiment 1.

[0023] The assembly of CR1220 battery is the same as in Example 1.

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Abstract

The invention provides a method for preparing lithium-silicon alloy cathodes. The method includes mixing analytically pure silicon powder and lithium powder with each other according to a molar ratio of (8-5):(2-5) to obtain mixtures; carrying out ball-milling on the mixtures in inert atmosphere environments for 4 hours to obtain sandy substances; filling foamed nickel with the sandy substances according to certain filling density; compressing tablets; heating the tablets until the temperatures of the tablets reach 160-170 DEG C and keeping the temperatures of the tablets unchanged for 1 hour; cooling the tablets until the temperatures of the tablets reach the room temperature and taking out the tablets to obtain the lithium-silicon alloy cathodes. The method has the advantages that the lithium-silicon alloy cathodes are low in polarization, high in capacity and long in cycle life; processes for manufacturing the lithium-silicon alloy cathodes are simple and are easy to implement and control and low in energy consumption.

Description

technical field [0001] The invention discloses a preparation method of a lithium-silicon alloy negative electrode, and belongs to the technical field of chemical power source energy storage. Background technique [0002] The rechargeable lithium-manganese battery is an important memory power source. Its positive electrode uses 3V lithium manganese oxide, and its negative electrode usually uses lithium-aluminum alloy negative electrode. The lithium-silicon alloy negative electrode has a capacity per unit volume that is significantly better than that of lithium-aluminum alloys. [0003] At present, there are two main methods for preparing lithium-silicon alloys: one is to prepare by pressurizing, mixing lithium powder and silicon powder in a certain proportion, and keeping the pressure at 0.1MPa for a certain period of time; the other is to prepare lithium The powder and silicon powder are evenly mixed and then placed in a closed container and sintered at high temperature. B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395
CPCH01M4/1395Y02E60/10
Inventor 郝德利叶丽光
Owner 天津赫维科技有限公司
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