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

详细信息    查看全文

• 作者：Haifang Ni ; Weili Song ; Lizhen Fan ; ^{fanlizhen@ustb.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Lithium titanate ; Carbon nanotubes ; Lithium-ion batteries ; Anode materials
• 刊名：Progress in Natural Science
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：26
• 期：3
• 页码：283-288
• 全文大小：1784 K

文摘

Spinel lithium titanate (Li₄Ti₅O₁₂) has the advantages of structural stability, however it suffers the disadvantages 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 related to the synergistic effects of the CNTs matrix and the carbon- coating layers with conductivity enhancement. Additionally, the amorphous carbon coating is an effective route to ameliorate the rate capability of Li₄Ti₅O₁₂/CNTs.