及其電化學(xué)性質(zhì)
(1. 中南大學(xué) 化學(xué)化工學(xué)院，長沙 410083；
2. 吉首大學(xué) 化學(xué)化工學(xué)院，吉首 416000)
摘 要: 以醋酸鋰和鈦酸四丁酯為原料，以乙醇為溶劑，采用溶膠−凝膠法制備Li4Ti5O12；以苯胺、過硫酸銨為原料，以鹽酸為溶劑，采用原位聚合法合成Li4Ti5O12-聚苯胺復(fù)合材料。采用X射線衍射、紅外光譜和電化學(xué)測試等對復(fù)合材料進(jìn)行了表征。結(jié)果表明，聚苯胺的加入明顯提高了Li4Ti5O12的電子導(dǎo)電性能，Li4Ti5O12-PAn復(fù)合材料具有比Li4Ti5O12更好的高倍率性能和循環(huán)穩(wěn)定性。0.1C和2.0C放電時Li4Ti5O12-PAn的放電容量分別達(dá)到了191.3和148.9 mA∙h/g，經(jīng)80次循環(huán)后二者平均每次循環(huán)容量衰減率分別為0.13%和0.61%。
關(guān)鍵字: 原位聚合合成法；Li4Ti5O12；聚苯胺；鋰離子電池
lithium ion batteries
（1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China）
Abstract:Li4Ti5O12 powders were prepared by sol-gel method using tetrabutyl titanate, lithium acetate and absolute alcohol as starting materials. Li4Ti5O12-polyaniline (Li4Ti5O12-PAn) composite was prepared by in situ polymerization method using aniline, ammonium persulfate and hydrochloricarried as starting materials. Li4Ti5O12-PAn composite was characterized by XRD, IR combined with electrochemical tests. The results show that the electrical conductivity is enhanced obviously due to the introduction of PAn to Li4Ti5O12. Li4Ti5O12-PAn composite exhibits greater high rate capability and cyclability than Li4Ti5O12. The composite can deliver a specific capacity of 191.3 and 148.9 mA∙h/g, only 0.13% and 0.61% of the capacity are lost after discharging for 80 times at 0.1C and 2.0C, respectively.
Key words: in-situ polymerization method; Li4Ti5O12; polyaniline; lithium ion batteries
