Li_4Ti_5O_(12)-聚苯胺复合材料的合成与表征  

Synthesis and Characterization of Li_4Ti_5O_(12)-polyaniline Composites

作　　者：何则强[1] 熊利芝[1] 陈上[1] 吴显明[1] 刘文萍[1] 黄可龙[2] 

机构地区：[1]吉首大学化学化工学院,吉首416000 [2]中南大学化学化工学院,长沙410083

出　　处：《无机化学学报》2007年第8期1382-1386,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金项目(No.20376086);湖南省教育厅科研项目;中国博士后科学基金项目(No.2005037700);中南大学博士后科学基金项目(No.2004107)。

摘　　要：以醋酸锂和钛酸四丁酯为原料,以乙醇为溶剂,采用溶胶-凝胶法制备Li4Ti5O12;以苯胺、过硫酸铵为原料,以盐酸为溶剂,采用原位聚合法合成Li4Ti5O12-聚苯胺复合材料。采用X-射线衍射、红外光谱和电化学测试等对复合材料进行了表征。结果表明,聚苯胺的加入明显提高了Li4Ti5O12的电子导电性能,Li4Ti5O12-PAn复合材料具有比Li4Ti5O12更好的高倍率性能和循环稳定性。0.1C和2.0C放电时Li4Ti5O12-PAn的放电容量达到了191.3和148.9mAh·g-1,经80次循环后二者平均每次循环容量衰减率分别为0.13%和0.61%。　Li4Ti5O12 powders were prepared by so-gel method using tetrabutyl titanate,lithium acetate and absolute alcohol as starting materials. Li4Ti5O12-polyaniline （Li4Ti5O12-PAn） composites were prepared by in situ polymerization method using aniline,ammonium persulfate and hydrochloricarried as starting materials. Li4Ti5O12-PAn composites were characterized by XRD,IR combined with electrochemical tests. Results show that the electrical conductivity is enhanced obviously due to the introduction of PAn to Li4Ti5O12. Li4Ti5O12-PAn composites exhibit better high rate capability and cyclability than Li4Ti5O12. The composites can deliver a specific capacity of 191.3 and 148.9 mAh·g^-1,only 0.13% and 0.61% of the capacity is lost after discharged for 80 times at 0.1C and 2.0C,respectively.

关 键 词：溶胶-凝胶法 原位聚合合成法 LI4TI5O12 聚苯胺 锂离子电池 

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