碳纳米管包覆量对天然石墨负极材料的电化学性能的影响  

Effects of CNT the content on electrochemical pr-operties of nature graphite anode materials

作　　者：邓凌峰[1] 彭辉艳 覃昱焜 吴义强[1] 

机构地区：[1]中南林业科技大学材料科学与工程学院,长沙410004

出　　处：《功能材料》2016年第12期12129-12133,共5页Journal of Functional Materials

基　　金：国家自然科学基金重点资助项目(31530009);湖南省自然科学基金重点资助项目(13JJ8019)

摘　　要：用溶胶-凝胶法将碳纳米管(CNT)包覆到天然石墨的表面,提高其充放电比容量和循环寿命性能,并研究了不同含量的碳纳米管对天然石墨电化学性能的影响。通过扫描电镜(SEM)、X射线衍射(XRD)和电化学测试等对CNT/天然石墨复合材料进行表征。结果表明,碳纳米管能在电极中构建空间三维导电网络,同时保留了天然石墨的晶体结构。随碳纳米管含量增加,复合材料的充放电比容量和循环稳定等电化学性能先升高后降低。碳纳米管包覆的质量分数为7%时,复合材料的综合性能最佳。在0.1C,CNT/天然石墨负极材料放电比容量为427mAh/g,比纯天然石墨(356mAh/g)提高了20%,循环100次后容量保持率仍有93.6%。Carbon nanotube （CNT）were coated on the natural graphite by sol-gel method,which were to im-prove the properties of charging-discharging specific capacityity and cycle life.The influences of CNT content on electrochemical properties of nature graphite were investigated.The composite materials were characterized by SEM,XRD,and charge-discharge method.The results showed that CNT formed 3D conducting network struc-ture.The crystal structure of natural graphite was retained.With the increase of the mass fraction of CNT,the electrochemical properties of composite material increased and then decreased.The CNT content of 7% had ex-cellent performance.The initial discharge capacities of CNT/nature graphite are 427 mAh/g at 0.1 C,which are 20% higher than natural graphite（356 mAh/g）.The capacity retention still had 93.6% after 100 cycles.

关 键 词：碳纳米管 导电网络 电化学性能 复合材料 

分 类 号：TM912[电气工程—电力电子与电力传动]