### 不同形貌结构Li4Ti5O12负极材料的最新进展

1. 重庆理工大学化学化工学院 重庆 400054
• 投稿日期:2013-04-18 发布日期:2013-06-27
• 通讯作者: 胡学步,E-mail:xuebu@cqut.edu.cn E-mail:xuebu@cqut.edu.cn
• 基金资助:

项目受国家自然科学基金(Nos. 21206203, 21077140)资助

### Recent Progress of Li4Ti5O12 with Different Morphologies as Anode Material

Zhang Yonglong, Hu Xuebu, Xu Yunlan, Ding Mingliang

1. College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054
• Received:2013-04-18 Published:2013-06-27
• Supported by:

Project supported by the National Natural Science Foundation of China (Nos. 21206203, 21077140).

Lithium-ion battery has developed rapidly in the past decades due to growing needs of electronic and information industries. Nowadays, the demand for lithium-ion batteries is still increasing and safety requirements are higher and higher. Therefore, exploration of a new anode material that is high safety and excellent cycle ability, as compared to commercial carbon/graphite materials, has been extensively attempted to meet the new need such as electric vehicles industry. Spinel Li4Ti5O12 as an anode material of power lithium-ion battery has become a research hotspot due to its appealing features such as "zero-strain" structure characteristic, excellent cycle stability, low cost, simple synthesis, high safety feature and flat charge-discharge voltage plateau (1.55 V vs. Li/Li+). It is also considered as one of the most promising anode material for lithium-ion battery. Despite many advantages associated with Li4Ti5O12, it can not meet the need of large-scale applications due to its pretty low electric conductivity (10-13 S·cm-1), moderate Li+ diffusion coefficient (10-9～10-13 cm2·s-1) and theoretical capacity (175 mAh·g-1). Several methods have been utilized to improve the conductivity and energy density of Li4Ti5O12, such as synthesis of nano-sized particle, ion doping, doping Li4Ti5O12 with other metals or metal oxides, coating Li4Ti5O12 with conductive carbons, nitridation on Li4Ti5O12 surface and composite anode materials prepared by Li4Ti5O12 and other anodes. In addition, unique structure has been proved as an effective way to improve the electric conductivity of the material. Moreover, morphology has also an important effect on electrochemical performances of Li4Ti5O12 such as specific capacity, specific energy, specific power, high rate performance and cycle life. This review focuses on the present status of different morphologies Li4Ti5O12 including spherical structure, porous (hollow) structure, nano-micro structure, core-shell structure, one-dimensional, two-dimensional and three-dimensional nanostructures, then summarized their advantages, resolved and unresolved problems, common synthesis methods and application areas, respectively. At last, the future development prospects of Li4Ti5O12 are presented.