Circuit board-like CoS/MXene composite with superior performance for sodium storage

By Youquan Zhang, Renming Zhan, Qiuju Xu, Heng Liu, Mengli Tao, Yushan Luo, Shu-juan Bao, C. Li, Mao-wen Xu. Chemical Engineering Journal, 2019

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Abstract Electrochemical performance of Ti3C2 MXene sheet is restricted by the modest specific capacity and self-restacking. To conquer the defects, we designed cobalt sulfide and Ti3C2 MXene flake composite (CoS/MXene) with heterolayered architecture, in which ultrafine CoS nanoparticles (∼6 nm) were anchored on MXene flakes. In this structure, the role of MXene is similar to printed circuit board, which providing conductive network. As anode for sodium ion batteries, CoS/MXene electrode delivers a high reversible capacity of 267 mA h g−1 after 1700 cycles at 2 A g−1 with an extreme low capacity decay rate of only ∼0.0072% per cycle, and an outstanding rate performance with 272 mA h g−1 at 5 A g−1.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/1a19ece6800c85ecfdabae8fa45472f9ffe4af67