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Double carbon decorated lithium titanate as anode material with high rate performance for lithium-ion batteries

Double carbon decorated lithium titanate as anode material with high rate performance for lithium-ion batteries

doi:
10.1016/j.pnsc.2016.05.005
Abstract:
Spinel lithium titanate (Li4Ti5O12) has the advantages of structural stability, however it suffers the dis-advantages of low lithium-ion diffusion coefficient as well as low conductivity. In order to solve issues, we reported a simple method to prepare carbon-coated Li4Ti5O12/CNTs (C@Li4Ti5O12/CNTs) using stearic acid as surfactant and carbon source to prepare carbon coated nanosized particles. The obtained Li4Ti5O12 particles of 100 nm in size are coated with the carbon layers pyrolyzed from stearic acid and dispersed in CNTs matrix homogeneously. These results show that the synthesized C@Li4Ti5O12/CNTs material used as anode materials for lithium ion batteries, presenting a better high-rate performance (147 mA h g ? 1 at 20 C). The key factors affecting the high-rate properties of the C@Li4Ti5O12/CNTs composite may be re-lated to the synergistic effects of the CNTs matrix and the carbon-coating layers with conductivity en-hancement. Additionally, the amorphous carbon coating is an effective route to ameliorate the rate capability of Li4Ti5O12/CNTs.
作者
Author: Haifang Ni Weili Song Lizhen Fan n
作者单位 Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083 China
期 刊: 自然科学进展(英文版) ISTIC EI SCI PKU CSSCI
年,卷(期) 2016, 26(3)
分类号
Keywords: Lithium titanate 知识脉络 Carbon nanotubes 知识脉络 Lithium-ion batteries 知识脉络 Anode materials 知识脉络
机标分类号 TB3 O6
基金项目 Financial supports from 973 Project,NSF of China (51532002,51372022,51575030 and 51302011) are grate-fully acknowledged
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