Li_4Ti_5O_(12)/(Ag+C)电极材料的固相合成及电化学性能  

Solid-State Synthesis and Electrochemical Performance of Li_4Ti_5O_(12)/(Ag+C) Electrode Material

作　　者：王蔚[1] 曹高劭[1] 叶静雅[1] 赵新兵[1] 

机构地区：[1]浙江大学材料科学与工程学系,杭州310027

出　　处：《无机化学学报》2009年第12期2151-2155,共5页Chinese Journal of Inorganic Chemistry

基　　金：浙江省科技技术项目(No.2007C21100)资助

摘　　要：以Li2CO3,TiO2为原料,葡萄糖为碳源,采用固相煅烧工艺合成了亚微米级的Li4Ti5O12/C复合负极材料。并将之与AgNO3复合,采用固相方法制备出了Ag表面修饰的Li4Ti5O12/(Ag+C)复合材料。采用XRD、SEM和TEM测试方法对材料的微结构进行了表征。结果表明,C的存在对Ag单质在Li4Ti5O12/C颗粒表面的大量形成起到了积极的促进作用,从而很大程度地提高了Li4Ti5O12/C的电导率,因此有效地改善了其电化学性能。在1C倍率下,Li4Ti5O12/(Ag+C)复合材料的首次放电容量达到了164mAh·g-1。Li4Ti5O12/C composite anode with a sub-micron size was synthesized via one-step calcination reaction using Li2CO3 and TiO2 as the starting materials and glucose as the carbon source. Li4Ti5O12/（Ag＋C） composite was prepared by heating Li4Ti5O12/C with AgNO3. Microstructures of the materials were characterized by XRD, SEM and TEM techniques. It is found that the existence of C facilitates the formation of Ag on the surface of the Li4Ti5O12/C particle, causing the enhancement of its electronic conductivity. As a result, the electrochemical performance of Li4Ti5O12/C was improved. The Li4Ti5O12/（Ag＋C） composite shows a high initial discharge capacity of 164 mAh·g^-1 at 1C rate.

关 键 词：Li4Ti5O12/(Ag+C) 表面修饰 锂离子电池 固相合成 

分 类 号：O614.111[理学—无机化学] O614.411[理学—化学]