酚醛树脂包覆氧化天然石墨作为锂离子电池负极材料.pdf

物理化学学报( Wuli Huarue Xuebao)
September
Acta Phys.-Chim:Sin.2011,27(9),2129-2134
Article
www.whxb.,pku.edu.cn
醛树脂包覆氧化天然石墨作为锂离子电池负极材料
高文超黄桃1沈宇栋2余爱水
(复旦大学化学系,新能源研究院,上海市分子催化和功能材料重点实验室,上海200438
无锡东恒新能源材料有限公司,江苏无锡214037)
摘要:天然石经过浓硫酸氧化处理,酚醛树脂包覆并高温碳化后形成具有核壳结构的碳包覆氧化天然石界
复合材料.采用扫描电子昆微镜(SEM,透射电子显微镜(TEM),X射线衍射(XRD),激光显微拉曼光谱
( Raman)等检测技术对氧化处理以及酚醛树脂热解碳包覆前后天然石材料的结构与形貌进行分析与表征
结果表明,氧化处理与适量的酚醛树脂热解碳包覆有效修复了大然石界表面的一些缺陷结构,使其表面更为光
滑.电化学测试结果显示,经过氧化处理与醛树脂热解碳包覆后天然石墨材料电化学性能得到明显提高.酚
醛树脂包覆量为9%时,复合材料表现出最好的电化学性能,其首次放电比容量为434.0mAh?g1,40次循环
后,放电比容量保持在361.6mAh?g-,而未经处理的天然石曌放电比容量仅为332.3mAhg.该改性方法有
效提高了天然石墨材料的比容量,对其进一步应用具有重要意义
关键词:负极材料;天然石墨;酚醛树脂;氧化;包覆
中图分类号:O646
Phenolic Resin Coated Natural Graphite Oxide as an Anode Material for
Lithium Ion Batteries
GAO Wen-chao HUANG Tao SHEN Yu-dong? YU Ai-shui'
(Department of Chemist Institute ofnew Energ Shanghai Key Laborator of Molecular Catalysis and nnovative Materials
Fudan University, Shanghai 200438, P R. China; Wuxi Dongheng New Energy Material Co, Ltd, Wuxi 214037
Jiangsu Province, P. R. China)
Abstract: A core-shell structure of the carbon-coated natural graphite oxide composite was successfully
prepared. Natural graphite was initially oxidized using concentrated sulfuric acid and then carbon coated
the carbonization of phenli resin at gh temperature. Scanning electron microscopy(SEM)
transmission electon micos op(TEM X-ray infraction(RD), and Raman techniques were used to
characterize the mophology an sructure of the natural graphite materials before and after oxidation and
carbon coating by the pyrolysis of the phenolic resin. The results showed that the surtace of the natura
graphite paricles became smoother and the surface defects were effectively modified after oxidation and
carbon coating. The electrocemical test results showed that the electrochemical performance of the
natural graphite improved significantly by oidation with sulfuric acid and by carbon coating. When the
covering amount of phenolic resin was 9% the modified natural graphite material gave the best
electrochemical performance Its initial discharge capacity was 434.0 mah. and it remained 361.6 mah
g after 40 charge-discharge cycles. The discharge capaci y of the untreated natural graphite was only
332 3 mah g. The modification approach that improved the capacity of the natural graphite effectively is
of great signifcance for e application of natural graphite in lithium ion batteries
Received May 13, 2011; Revised: July 7, 2011; Published on Web July 2%, 2011
Corresponding author. Email: asu(fudan.edu.cn; Tei/Fax: +86-21-51630320
The project was supported by the Key Program of Basic Research of the Shanghai Commitee of Science and Technology, China(10JC140 1500)and
Department of Chemistry and Shanghai Key Laboratory of Molecular and Innovative Materials, China(08DZ2270500
上海市基础研究重点项目(10JC1401500和上海市分子催化和功能材料重点实验室(08DZ2270500)资助
C Editorial office of Acta Physico-chimica Sinica