C+Ag/Li4Ti5O12复合材料的制备和性能研究  

Sythesis and Electrochemical Performance of C+Ag/Li_4Ti_5O_(12) Compound Materials

作　　者：程琦[1] 涂吉 汤舜 赵金星[1] 刘畅 黄高旭 梁济元[1] 曹元成[1] CHEN Qi;TU Ji;TANG Shun;ZHAO Jinxing;LIU Chang;HUANG Gaoxu;LIANG Jiyuan;CAO Yuancheng(Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education,Jianghan University,Wuhan 430056,Hubei,China;School of Chemistry and Environmental Engineering,Jianghan University,Wuhan 430056,Hubei,China;Flexible Display Materials and Technology Co-Innovation Centre of Hubei Province,Jianghan University,Wuhan 430056,Hubei,China)

机构地区：[1]江汉大学光电化学材料与器件教育部重点实验室,化学与环境工程学院,柔性显示材料与技术湖北省协同创新中心,湖北武汉430056

出　　处：《江汉大学学报（自然科学版）》2017年第6期496-502,共7页Journal of Jianghan University：Natural Science Edition

基　　金：国家863计划资助项目(20115AA033406);湖北省高等学校优秀中青年科技创新团队计划资助项目(T201318);武汉市应用基础研究项目(2015011701011593);武汉市第4批黄鹤英才计划;江汉大学科研启动基金资助项目(08010001);江汉大学武汉研究院开放项目(IWSH2016348)

摘　　要：以Li_2CO_3,锐钛矿纳米TiO_2为原料采用高温固相法合成了微米级Li_4Ti_5O_(12)负极材料,并将其与葡萄糖、Ag NO3复合,制备出了C+Ag表面修饰的C+Ag/Li_4Ti_5O_(12)复合材料。借助XRD、SEM、电化学工作站和充放电测试仪表征C+Ag/Li_4Ti_5O_(12)材料的物理性能和电化学性能。结果表明:C+Ag表面修饰的Li_4Ti_5O_(12)复合材料有效提升了Li_4Ti_5O_(12)的电化学性能。0.1 C首次放电比容量为165.8 m Ah/g,5 C放电比容量仍可达到80 m Ah/g。C+Ag/Li4Ti5O12micron size particles were synthesized as negative electrode materials with Li2CO3,anatase TiO2,glucose,AgNO3as raw materials with a high temperature solid state reaction in an Ar atmosphere.The phase structure,morphologies and electrochemical properties of the materials were systematically characterized with XRD,SEM,electrochemical workstation,charge-discharge battery tester.The results demonstrated that C and Ag doped Li4Ti5O12as the negative electrode materials of lithium-ion batteries had excellent electrochemical performances,C+Ag/Li4Ti5O12exhibited a higher specific capacity,better cycling performance and better rate capability than those of pristine Li4Ti5O12.The initial discharge capacity reached165.8mAh/g at0.1C,and the discharge capacity still remained80mAh/g at5C.

关 键 词：钛酸锂 电导率 掺杂 包覆 倍率 

分 类 号：TQ152[化学工程—电化学工业]