A Li4Ti5O12/TiO2@CNT Core/Shell Structure for Rechargeable Li Batteries

作者：Chen Lu; Liu Jianzhong; Niu Xiaoying; Chen Ying; Zhong Liqiao; Cai Chennan; Gao Lijun; Ni Jiangfeng^*

来源：Journal of Nanoscience and Nanotechnology, 2015, 15(9): 7035-7039.

DOI：10.1166/jnn.2015.10553

• Lithium Ion Battery
• Lithium Titanate
• Carbon Nanotube
• Core/Shell Structure

Li4Ti5O12 is an important type of anode material for rechargeable Li battery due to its excellent cycling and thermal reliability, but the poor conductivity represents a significant challenge in the scalable application. Here we design a ternary Li4Ti5O12/TiO2@CNT core/shell structure to well mitigate the conductivity issue. The hybrid core/shell structure is fabricated by a facile hydrothermal reaction followed by heat treatment at 600 degrees C. It is comprised of Li4Ti5O12/TiO2 nanocrystals several nanometers in dimension tightly anchored on CNT network. The CNT network provides a fast and robust conductive way for electron transport, while the minor rutile-TiO2 phase improves the kinetics of Li4Ti5O12 toward fast lithium insertion/extraction. The electrochemical results indicate that the core/shell structure displays a high electrochemical activity in terms of reversible capacity and rate capability. The hybrid structure also shows excellent long-term cycling stability when operated at a high rate of 5 C.

• 出版日期2015-9
• 单位苏州大学