Open AccessA Dual Protection System for Heterostructured 3D CNT/CoSe 2 /C as High Areal Capacity Anode for Sodium Storage
Author(s) -
Yousaf Muhammad,
Chen Yijun,
Tabassum Hassina,
Wang Zhipeng,
Wang Yunsong,
Abid Adeel Y.,
Mahmood Asif,
Mahmood Nasir,
Guo Shaojun,
Han Ray P. S.,
Gao Peng
Publication year - 2020
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201902907
Subject(s) - anode , materials science , electrolyte , gravimetric analysis , electrode , nanoparticle , chemical engineering , nanotechnology , carbon nanotube , carbon fibers , microstructure , amorphous solid , amorphous carbon , composite material , chemistry , composite number , organic chemistry , engineering
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 CoSe 2 nanoparticles (NPs) which are protected under carbon overcoat (CNT/CoSe 2 /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 CoSe 2 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.