Preparation method of tin carbon composite material for negative electrode of lithium ion batteries

A lithium-ion battery and tin-carbon technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of sacrificing the overall specific capacity and increasing the first irreversible capacity, so as to reduce the irreversible capacity, improve the charge and discharge efficiency, and reduce the degree of damage Effect

Active Publication Date: 2014-09-10
SOUTH CHINA UNIV OF TECH
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the former, the ball milling time is as long as 150h in order to refine the powder, and the long-time ball milling makes C amorphous, introduces a large number of defects, and greatly increases the first irreversible capacity; although the latter ball milling time is shortened to 25h, it adds a large amount of Inactive material, sacrificing its overall specific capacity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of tin carbon composite material for negative electrode of lithium ion batteries
  • Preparation method of tin carbon composite material for negative electrode of lithium ion batteries
  • Preparation method of tin carbon composite material for negative electrode of lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] After mixing the tin raw material and the graphite raw material powder, the mass ratio of the carbon raw material to the total raw material is 30%. According to the above ball milling method, the tin-carbon mixed powder after ball milling was obtained, the discharge gas medium is argon, the ball powder mass ratio of the ball and the mixed powder is 30:1, and the ball milling time is 2.5h; then according to the above battery test conditions And steps for charge and discharge test, the first reversible capacity of the prepared Sn-30wt%C composite material is 613mAh / g.

Embodiment 2

[0043] The method of dielectric barrier discharge plasma-assisted ball milling is used to prepare tin-carbon composite materials for lithium-ion battery negative electrodes. The steps are basically the same as in Example 1, except that the raw materials are proportioned according to Sn-Xwt%C, where the value of X For X=50, the mass ratio of the ball powder to the mixed powder is 40:1, and the ball milling time is 5h. The above powders were made into electrode sheets and batteries were assembled for charge and discharge tests. The first reversible capacity of the prepared Sn-50wt%C composite was 480mAh / g.

Embodiment 3

[0045] The method of dielectric barrier discharge plasma-assisted ball milling is used to prepare tin-carbon composite materials for lithium-ion battery negative electrodes. The steps are basically the same as in Example 1, except that the raw materials are proportioned according to Sn-Xwt%C, where the value of X For X=50, the mass ratio of the ball powder to the mixed powder is 50:1, and the ball milling time is 7.5h. The above powders were made into electrode sheets and batteries were assembled for charge and discharge tests. The first reversible capacity of the prepared Sn-50wt%C composite was 497mAh / g.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a preparation method of a tin-carbon composite material for lithium-ion battery negative electrodes, which specifically comprises the following steps: adopting a dielectric barrier discharge plasma-assisted high-energy ball milling method, ball milling mixed powder of tin and graphite raw materials for 2.5h to 20h, A tin-carbon composite powder is obtained; the tin-carbon composite powder is made into a lithium-ion electrode sheet and a battery is assembled. Wherein the quality of the graphite raw material is 30%~70% of the total mass of the mixed powder; the mass ratio of the ball powder used in the ball mill to the mixed powder of tin and graphite is 30:1~70:1; the medium is not mixed with The inert gas in which Sn reacts is one of helium, neon, argon, krypton, xenon or nitrogen. The invention can effectively improve the ball milling efficiency, maintain the lamellar integrity of graphite, improve the first reversible capacity and cycle life, and refine the Sn particles, reduce the relative volume change of the working electrode in the charging and discharging process, and improve the cycle performance of the lithium battery .

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method of a tin-carbon composite material for lithium ion battery negative electrodes. Background technique [0002] At present, most commercially used lithium-ion batteries use carbon materials as negative electrodes, but the energy density and specific energy density of carbon materials are low (the theoretical specific capacity of carbon materials is only 372mA hg -1 . With the rapid development of the electronics industry, the capacity of existing lithium batteries has been difficult to meet the needs of various fields. Many metal materials (such as Sn, Si, Al) can react with lithium to form alloys, thus having a high theoretical capacity. Sn can form Li with Li 4.4 Sn, the theoretical capacity is 990mA·hg -1 , is expected to replace carbon materials and become a commercial anode material for lithium-ion batteries. However, during the charging and disch...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 朱敏刘辉胡仁宗曾美琴施振华
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap