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Li4Ti5O12纳米球改性天然石墨及其电性能研究

Preparation and Performance of Graphite Modified with Nano-Shpere Li4Ti5O12 Coating
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摘要 用溶胶凝胶法对天然石墨（NG）进行表面改性处理,即在NG表面形成Li4Ti5O12（LTO）纳米球包覆层,并对其电性能进行了研究。分析表明,LTO纳米球在石墨表面单分散均匀分布,粒径为50-150 nm。此表面改性,提高了NG的首次效率及克容量,分别为1.4%和37.9 mAh/g;全电池测试结果发现,LTO改性后,在2.4-2.8 V之间的副反应明显减少,即石墨表面结构破坏减少、不可逆容量减少,从而提高了首次效率及克容量。 Natural graphite is modified by coating LTO nanosphere using sol-gel method,which formed a composite structure anode material—LTO-G. The electrical chemical performance of the LTO-G is studied. The results show that LTO nanosphere is monodispersed particles with 50 - 150 nm. The 1stefficiency and specific capacity of graphite modified by LTO nanosphere is improved about 1. 4% and 37. 9 mAh /g in comparison to primary graphite. The results of full cell evaluation show that,the side reaction at 2. 4 - 2. 8V of modified graphite—caused by graphite structure,failed less than primary graphite. And the corresponding irreversible capacity is decreased and 1stefficiency and specific capacity is improved by LTO modified.
作者 崔航 刘东任 钟开富 汪颖
机构地区 东莞新能源科技有限公司
出处 《东莞理工学院学报》 2014年第5期83-86,共4页 Journal of Dongguan University of Technology
关键词 LTO纳米球 改性 NG溶胶-凝胶法 LTO nanoshpere modified NG Sol-gel method
分类号 O646 [理学—物理化学]
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参考文献11

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东莞理工学院学报
2014年 第5期

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