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0．1 C,CNT/天然石墨负极材料放电比容量为427 mAh/g,比纯天然石墨(356 mAh/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.
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