Effects of different carbon sources on the electrochemical properties of Li₄Ti₅O₁₂/C composites

详细信息	查看全文 | 推荐本文 |

• 作者：Ruying Wang ; Juan Wang ; Tian Qiu ; Lipeng Chen ; Haimei Liu ; ^{liuhm@mail.buct.edu.cn} ; Wensheng Yang ; ^{yangws@mail.buct.edu.cn} ; ^{yangws_buct@126.com}
• 关键词：Lithium ion battery ; Li4Ti5O12/C composite ; Carbon source ; Electrochemical property ; Safety performance
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：30 May, 2012
• 卷：70
• 期：Complete
• 页码：84-90
• 文件大小：1416 K

摘要

Li₄Ti₅O₁₂/C composites have been synthesized via a solid state reaction with TiO₂-anatase, Li₂CO₃ and different carbon sources, such as conductive graphite KS-6 and sucrose, as the starting materials. It was found that the carbon layer from sucrose was homogeneously coated on the Li₄Ti₅O₁₂ surface and the KS-6 was embedded among the Li₄Ti₅O₁₂ particles as a conductive bridge without affecting the spinel structure of Li₄Ti₅O₁₂. Moreover, it was demonstrated that the sucrose and KS-6 played different roles in improving the electrochemical properties of Li₄Ti₅O₁₂/C composite. Compared with samples prepared by solely KS-6 or sucrose as the carbon source, the Li₄Ti₅O₁₂/C composite (LTO-1) with KS-6 and sucrose as carbon sources together revealed the optimal electrochemical performance. It showed a high initial specific capacity of 152.5 mAh g^鈭? at 0.2 C and an excellent cycling performance with 96.8%capacity retention after 1000 cycles at 25 掳C at 1 C. Furthermore, the (LTO-1)/LiMn₂O₄ full battery demonstrated a good cycling performance at 55 掳C and could pass the 5 C-20 V overcharge test, external short-circuit and nail-puncture test. Therefore, it is believed that the Li₄Ti₅O₁₂/C might be a promising anode material for large-scale lithium ion batteries of electric vehicle (EV), hybrid electric vehicle (HEV) and energy storage devices for solar or wind energy.