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Cathode material of lithium ion battery and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as loss of electrical contact of electrode materials, degradation of electrode cycle performance, and collapse of material structures.

Inactive Publication Date: 2013-01-30
东莞市翔丰华电池材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the condition of high degree of lithium intercalation and extraction, silicon-based materials have serious volume effects, which can easily lead to the collapse of the material structure and the peeling off of the electrode material, causing the electrode material to lose electrical contact, resulting in a sharp drop in electrode cycle performance.

Method used

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  • Cathode material of lithium ion battery and preparation method thereof
  • Cathode material of lithium ion battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare each raw material according to the specifications and mass shares listed in Table 1:

[0019] The mass proportion and specification of each raw material of table 1 embodiment one

[0020] raw material

Mass share

Specification

Silicon fume

15

Particle size range: 50-500nm

natural spherical graphite

78

Particle size range: 7-22um, fixed carbon content: ≥99.95%

asphalt

7

[0021] Steps:

[0022] a) Add NMP solution of specific polymer to silicon powder, stir for 4 hours, then dry at 60-100°C;

[0023] b) Mix silicon powder and graphite by mechanical ball milling, the speed of mechanical ball milling is 1000-4000rpm, and the ball milling time is 1-10 hours; then dry under vacuum conditions, the vacuum drying time is 4-16 hours, the drying temperature 40-200°C;

[0024] c) Dissolving the coating agent in a solvent to prepare a solution of the coating agent, the dissolving temperature is 25...

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Abstract

The invention discloses a cathode material of a lithium ion battery and a preparation method thereof. The cathode material comprise the following raw materials by mass parts: 1 to 30 parts of silica fume, 60 to 97 parts of natural spherical graphite and 2 to 10 parts of a coating agent. The method comprises adsorbing a layer of conductive film on the silica fume, mechanically milling and mixing the silica fume and the graphite and then drying under vacuum, putting the mixture into a prepared solution of the coating agent for coating, removing the solvent, drying under vacuum and heating under high temperature, sieving when necessary, and finally getting the cathode material. The preparation method provided by the invention is simple to operate and low in cost; the cathode material prepared by the method has an initial reversible capacity of more than 2663 mAh / g and an initial efficiency of more than 95 %, can maintain a capacity of 90 % after being cycled for 600 times, and is excellent in charging and discharging performances.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] With the wide application and rapid development of various portable electronic devices and electric vehicles, people's demand and performance requirements for the power supply of various electrical products are also getting higher and higher. It has been successfully and widely used in the field of mobile electronic terminal equipment in the past ten years. [0003] The improvement of lithium-ion battery performance mainly depends on the performance of lithium intercalation and extraction electrode materials. At present, mesophase carbon microspheres and modified graphite are widely used as negative electrode materials in commercial lithium-ion batteries, but there are disadvantages such as low theoretical lithium storage capacity (graphite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 赵东辉戴涛周鹏伟
Owner 东莞市翔丰华电池材料有限公司
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