高结晶度片状钛酸锂/石墨烯复合材料的可控制备及其电化学性能  

Controlled preparation and electrochemical performance of a flaky Li_4Ti_5O_(12)-graphene hybrid with a high crystallinity

作　　者：董海勇 贺艳兵[1] 李宝华[1] 康飞宇[1] 

机构地区：[1]清华大学深圳研究生院深圳炭功能材料工程实验室,广东深圳518055

出　　处：《新型炭材料》2016年第2期115-120,共6页New Carbon Materials

基　　金：国家自然科学青年基金项目(51202121);深圳市基础研究计划(三大产业)重大培育项目(JC201104210152A)~~

摘　　要：以氧化石墨烯为模板剂,N-甲基吡咯烷酮(NMP)为溶剂,通过溶剂热法制备高结晶度、片状结构钛酸锂/石墨烯复合电极材料(NMP-LTO/G)。与未添加氧化石墨烯的样品NMP-LTO相比,样品NMP-LTO/G的片状结构更好,结晶性与电化学性能明显提高。讨论氧化石墨烯作为模板剂的作用机理;基于双亲性结构特征和表面活性剂的特点,在复合材料制备过程中,氧化石墨烯与碱性条件、有机溶剂等产生协同作用,有利于高结晶度片状结构NMP-LTO/G复合材料形成。A Li_4Ti_5O_（12）（ LTO）-graphene（ G） hybrid with a flaky structure was fabricated by solvothermal treatment of a suspension of graphene oxide（ GO）,lithium hydroxide and tetrabutyltitanate in 1-methyl-2-pyrrolidinone,follow ed by calcination of the solid product at 700℃ for 1 h. GO as the precursor of graphene is amphiphilic and acts as an anionic surfactant and template for the grow th of LTO under alkaline conditions to form the flaky LTO-G hybrid w ith a high crystallinity. Compared w ith the material w ithout GO,the LTO-G has a typical flaky morphology and exhibits a much higher capacity and betterrate capability.

关 键 词：钛酸锂 石墨烯 模板剂 片状形貌 高结晶性 

分 类 号：TB33[一般工业技术—材料科学与工程]