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论文专利

Yury Gogotsi千人团队研究论文在Energy Storage Materials上发表

发布时间:2017年 06月 05日 02时 02分 编辑: 点击量:44


Li-ion Uptake and Increase in Interlayer Spacing of Nb4C3 MXene



 


Authors:

Shuangshuang Zhaoa, Xing Menga,c, Kai Zhua, Fei Dua, Gang Chena,b, Yingjin Weia, 
Yury Gogotsia,c*, Yu Gaoa*

Abstract:
Two-dimensional (2D) carbides, MXenes, have shown promise for electrochemical energy storage, but most studies were conducted on titanium carbides. Herein we report on Li insertion into a 2D Nb4C3Tx MXene, formed by etching aluminum from Nb4AlC3 in HF at room temperature. The theoretical capacity of Nb4C3Tx has not been studied, but it displayed a higher capacity than as-produced titanium carbide and other MXenes, when tested as anode for lithium ion batteries. In addition, the charge/discharge capacity of the Nb4C3Tx anode increases with cycling. For instance, after 100 charge/discharge cycles, the specific capacity increased from 310 mAh g-1 (194 mAh cm-3) to 380 mAh g-1 (238 mAh cm-3), at a current density of 0.1 A g-1, and the capacity increased from 116 mAh g-1 (73mAh cm-3) to 320 mAh g-1 (200 mAh cm-3) at 1 A g-1. Excellent rate capability and superior long-term stability at the ultrahigh rates have been demonstrated. This work is expected to inspire further exploration of MXenes for high-performance Li-ion batteries and capacitors. Since Nb4C3Tx is just one of many MXenes, there is much room for improving the accessibility of the electronically conducting layered structures of MXenes and achieving a better electrochemical performance.

Published in Energy Storage Materials (http://dx.doi.org/10.1016/j.ensm.2017.03.012)