(1. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083；2. 長沙理工大學(xué) 化學(xué)與生物工程學(xué)院，長沙 410004)
摘 要: 采用高溫固相法合成Li4FexTi5-xO12(x=0.025, 0.1, 0.2)負(fù)極材料。通過X射線衍射、掃描電鏡、充放電性能測試等對摻雜Fe3+的Li4Ti5O12材料的組成、結(jié)構(gòu)、形貌進(jìn)行表征，并對其電化學(xué)性能進(jìn)行研究。結(jié)果表明，所合成的材料具有良好的尖晶石結(jié)構(gòu)，無雜相。適當(dāng)Fe3+摻雜能細(xì)化材料，提高材料的電子導(dǎo)電性，使材料的循環(huán)性能得到改善。Li4Fe0.025Ti4.975O12的充電容量最佳，0.1C倍率下首次充電比容量達(dá)到162.5 mA·h/g，循環(huán)性能較好。
關(guān)鍵字: 鋰離子電池；Li4Ti5O12；Fe3+摻雜；負(fù)極材料
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;2. School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410004, China）
Abstract:Li4FexTi5-xO12(x=0.025, 0.1, 0.2) anode materials was synthesized by solid-state reaction. Its component, structure, morphology and electrochemical properties were characterized by XRD, SEM and charge-discharge tests. The results show that the synthesized material is pure spinel phase. The particle size of samples with Fe3+-doping decreases in a certain extent, and appropriate amount of Fe3+-doping in Li4Ti5O12 leads to obvious increase in initial and cycling stability, which are ascribe to the smaller particle and better electronic conduction. Li4Fe0.025Ti4.975O12 sample has higher charge capacities than other samples. The initial charge specific capacity of Li4Fe0.025Ti4.975O12 is 162.5 mA·h/g at 0.1 C, showing that it has good cycling behavior.
Key words: lithium ion batteries; Li4Ti5O12; Fe3+-doping; anode materials
