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，Li4rri5O12-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％。
Li4Ti5Ol2 powders were prepared by so-gel method using tetrabutyl titanate, lithium acetate and absolute alcohol as starting materials. Li4Ti5Ol2-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, only 0.13% and 0.61% of the capacity is lose after discharged for 80 times at 0.1C and 2.0C,respectively.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第A04期1419-1422,共4页
Journal of Functional Materials
基金
基金项目：国家自然科学基金资助项目（20376086）
中国博士后科学基金资助项目（2005037700）
中南大学博士后科学基金资助项目（2004107）
