A Dual Protection System for Heterostructured 3D CNT/CoSe2/C as High Areal Capacity Anode for Sodium Storage

Advanced Science

Hassina Tabassum¹  Ray P. S. Han¹  Shaojun Guo¹  Yunsong Wang¹  Zhipeng Wang¹  Muhammad Yousaf¹  Yijun Chen¹  Peng Gao²  Adeel Y. Abid²  Asif Mahmood³  Nasir Mahmood⁴ 

[1] Department of Material Science and Engineering Peking University Beijing 100871 China;International Center for Quantum Materials and Electron Microscopy Laboratory School of Physics Peking University Beijing 100871 China;School of Chemical and Biomolecular Engineering The University of Sydney 2006 Sydney Australia;School of Engineering RMIT University 124 La Trobe Street Melbourne Victoria 3001 Australia;

关键词: 3D electrodes;    CNT/CoSe2/C;    dual conductive network;    high areal capacity;    sodium‐ion batteries;   

DOI  :  10.1002/advs.201902907

来源: DOAJ

【 摘 要 】

Abstract 3D electrode design is normally opted for multiple advantages, however, instability/detachment of active material causes the pulverization and degradation of the structure, and ultimately poor cyclic stability. Here, a dually protected, highly compressible, and freestanding anode is presented for sodium‐ion batteries, where 3D carbon nanotube (CNT) sponge is decorated with homogeneously dispersed CoSe2 nanoparticles (NPs) which are protected under carbon overcoat (CNT/CoSe2/C). The 3D CNT sponge delivers enough space for high mass loading while providing high mechanical strength and faster conduction pathway among the NPs. The outer amorphous carbon overcoat controls the formation of solid electrolyte interphase film by avoiding direct contact of CoSe2 with electrolyte, accommodates large volume changes, and ultimately enhances the overall conductivity of cell and assists in transmitting electron to an external circuit. Moreover, the hybrid can be densified up to 11‐fold without affecting its microstructure that results in ultrahigh areal mass loading of 17.4 mg cm−2 and an areal capacity of 7.03 mAh cm−2 along with a high gravimetric capacity of 531 mAh g−1 at 100 mA g−1. Thus, compact and smart devices can be realized by this new electrode design for heavy‐duty commercial applications.

【 授权许可】

Unknown