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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

废人造石墨用作锂电池负极的表面氧化成膜改性

张永刚1, 王成扬2, 闫裴2   

  1. 1. 天津工业大学 材料科学与化学工程学院, 天津 300160, 2. 天津大学 化工学院, 天津 300072
  • 收稿日期:2006-09-05 修回日期:2006-11-06 出版日期:2007-07-20 网络出版日期:2007-07-20

Surface Oxidation and Similar SEI Formation on Scrap Artificial Graphite as Negative Material of Lithium Ion Batteries

ZHANG Yong-Gang1, WANG Cheng-Yang2, YAN Pei2   

  1. 1. School of Material Science and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300160, China; 2. School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China

  • Received:2006-09-05 Revised:2006-11-06 Published:2007-07-20 Online:2007-07-20

PDF (PC)

2015

被引次数

15

摘要： 废人造石墨在室温下经30%的双氧水氧化, 真空干燥后进一步用LiOH浸渍处理或与Li2CO3共混后在N2保护下升温处理, 在人造石墨表面形成类SEI膜用作锂离子电池的负极材料. X射线衍射和X射线光电子能谱测试分析表明, 表面氧化成膜处理使得人造石墨表面形成以Li2CO3为主要成分的膜层, 石墨颗粒表面的氧含量增加, 含氧官能团增多. 样品的充放电测试结果表明: 氧化成膜样品的放电容量均超过323mAh/g, 均大于处理前的255.5 mAh/g, 前50次循环的可逆放电容量基本没有衰减, 仍保持在317mAh/g以上, 说明氧化成膜处理有利于减少形成SEI膜时锂离子的消耗, 抑制溶剂和电解质的分解, 充放电效率提高.

关键词: 锂离子电池, 废人造石墨, 氧化成膜, 负极材料

Abstract: Scrap artificial graphite used as negative material of lithium ion batteries was firstly oxidized with 30% H2O2 at room temperature, and then modified by two methods: LiOH impregnation and molten Li2CO3 coating technique with N2 protection. X-ray diffraction and X-ray photoelectron spectroscopy analysis show that these two modification methods can form Li2CO3 film as similar SEI film on the graphite surface, and increase oxygen content and oxygenic functional groups on the graphite surface. Compared with that of untreated artificial graphite, the charge capacities of treated samples with oxidation and similar SEI formation increase from 255.5mAh/g to 323mAh/g upward, and the reversible capacity decreases a little in the first fifty cycles, keeping 317mAh/g. It proves that surface oxidation and similar SEI formation treatment can reduce lithium ion consumption, restrain decomposition of solvent and electrolyte, and improve coulombic efficiency.

Key words: lithium ion battery, scrap artificial graphite, oxidation and film formation, negative material

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