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

Advanced Science
Muhammad YousafPeng Gao

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...Continue Reading

References

Mar 11, 2010·Advanced Materials·Xuchun GuiDehai Wu
Oct 14, 2014·Journal of the American Chemical Society·Youwen LiuYi Xie
Oct 29, 2015·Nature·Eric C Evarts
Jan 20, 2016·Accounts of Chemical Research·Wei LuoLiangbing Hu
Feb 27, 2016·ACS Applied Materials & Interfaces·You Na KoYun Chan Kang
Apr 14, 2018·ACS Applied Materials & Interfaces·Muhammad YousafRay P S Han
Sep 1, 2018·Chemical Communications : Chem Comm·Xiaoqing MaWenxi Zhao

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Citations

Oct 24, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Muhammad SajjadJ Andreas Larsson
Sep 24, 2021·ACS Applied Materials & Interfaces·Huanglin DouXiaowei Yang

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Methods Mentioned

BETA
2
2 hybrid
transmission electron microscopy
electron diffraction
scanning electron microscopy

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