(1. 吉首大學 化學化工學院，吉首 416000；
2. 中南大學 化學化工學院，長沙 410083)
摘 要: 以醋酸鋰、鈦酸丁酯和石墨為原料，無水乙醇為溶劑，采用濕法制備Li4Ti5O12/石墨復合材料。采用X射線衍射、紅外光譜、掃描電鏡和電化學測試對合成產物進行表征。結果表明：600 ℃氬氣氣氛中煅燒6 h可制得含碳量5%左右的Li4Ti5O12/石墨復合材料，其可逆容量達到167.1 mA∙h/g；經80次循環(huán)后，0.1C放電時容量保持率為99.0%，2.0C放電時容量保持率達到105.1%。與純Li4Ti5O12相比，Li4Ti5O12/石墨復合材料具有更好的循環(huán)性能和倍率性能，是一種優(yōu)良的鋰離子電池負極材料。
關鍵字: 鋰離子電池；Li4Ti5O12；負極；濕法
Li4Ti5O12/graphite composite
（1. College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:Li4Ti5O12/graphite composite was prepared by wet method using lithium acetate, tetrabutyl titanate and graphite as raw materials, ethyl alcohol as solvent. Li4Ti5O12/graphite composites were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and electrochemical tests. The results show that Li4Ti5O12/graphite composite with 5% carbon can be obtained by annealing the precursor at 600 ℃ for 6 h in Ar atomosphere. The composites can deliver a specific capacity of 167.1 mA∙h/g, 99.0% and 105.1% of the capacity can be retained after being discharged for 80 times at 0.1C and 2.0C, respectively. Compared with pure Li4Ti5O12, Li4Ti5O12/graphite composite bears larger discharge capacity, better cyclability and rate performance, suggesting that Li4Ti5O12/graphite composite is a promising anode material for lithium ion batteries.
Key words: lithium ion batteries; Li4Ti5O12; anode; wet method
