无机材料学报2012，Vol.27Issue(2)：151-156,6.DOI:10.3724/SP.J.1077.2012.00151
微氧化处理对球形石墨结构及电化学行为的影响
Influences of Mild Oxidation Treatment on the Structure and Electrochemical Behavior of Spherical Graphite
摘要
Abstract
The effects of mild oxidation treatment on the crystal structure, morphology and electrochemical behavior of spherical graphite were investigated. The structure and morphology of the samples were characterized by XRD, Raman spectra and SEM analysis, respectively. The electrochemical behavior of the samples was studied using galvanostatic charge/discharge test, powder cavity microelectrode technique and slow scan rate cyclic voltam-mograms. The results indicate that structural defects in graphite particles and disordered degree of near surface region of graphite increase after modification, while the average in-plane crystallite domain size La and content of rhombohedral phase decrease. The graphite particles present irregular flake shape and some graphene sheets show flexual and sculptural margin. Electrochemical measures show that reversible capacity of modified graphite increases from 345.5 mAh/g to 381.4 mAh/g, and cycling performance is improved. During deintercalation process of the modified graphite, stage transformation from stage 1 Li-GICs (lithium-graphite intercalation compounds) to stage 2 Li-GICs begins to happen at lower voltage, compared with that of the raw graphite.关键词
锂离子电池/负极材料/球形石墨/氧化处理/电化学行为Key words
lithium-ion batteries/ anode material/ spherical graphite/ oxidation treatment/ electrochemical behavior分类
信息技术与安全科学引用本文复制引用
简志敏,刘洪波,石磊,何月德,肖海河,匡加才..微氧化处理对球形石墨结构及电化学行为的影响[J].无机材料学报,2012,27(2):151-156,6.基金项目
国土资源部公益性行业科研专项经费(201011031) （201011031）
湖南省国土资源厅科技项目(2010-08) （2010-08）
