Synthesis of High Reversibility Anode Composite Materials Using T-Nb 2 O 5 and Coal-Based Graphite for Lithium-Ion Battery Applications

作者：Xiaoxiao Qu, Yuhao Liu, Binbin Li, Baolin Xing, Guangxu Huang, Chuanxiang Zhang, Suck Won Hong, Jianglong Yu, Yijun Cao · 发表于：Energy & Fuels · 年份：2020 · DOI：10.1021/acs.energyfuels.9b04106 · 被引用次数：52 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced Battery Technologies Research

Nb 2 O 5, as a potential electrochemical material, has been studied extensively due to its superior volumetric stability and safety. In the paper, we report a novel method for the synthesis of a T-Nb 2 O 5 /coal-based graphite (CBG) composite via a solvothermal method combined with calcination to overcome the limited low level of the ionic diffusivity and electric conductivity of Nb 2 O 5 . The homogeneous distribution of the Nb 2 O 5 nanoparticles on the coal-based graphite surface can suppress the accumulation of Nb 2 O 5 and reduce the internal resistance. As an anode material for Li-ion batteries, the T-Nb 2 O 5 /CBG-2 composite presents a high capacity, outstanding cyclic stability, and superior reversibility. The newly developed composite of T-Nb 2 O 5 /CBG-2 indicates an initial specific capacity of 378 and 661 mAh g –1 at 0.02 A g –1 in the charge/discharge process. At a current density of 0.2 A g –1, the T-Nb 2 O 5 /CBG-2 composite materials can maintain a stable capacity of 216 mAh g –1 after 100 cycles. Moreover, after the current density has returned to 0.02 A g –1, it is possible to recover a large capacity of 416 mAh g –1, which represents the excellent reversibility of T-Nb 2 O 5 /CBG-2.