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Hollow CuS Nanoboxes as Li‐Free Cathode for High‐Rate and Long‐Life Lithium Metal Batteries
Author(s) -
Chen Yawei,
Li Jianming,
Lei Zhanwu,
Huo Yakun,
Yang Lanlan,
Zeng Suyuan,
Ding Honghe,
Qin Yi,
Jie Yulin,
Huang Fanyang,
Li Qi,
Zhu Junfa,
Cao Ruiguo,
Zhang Genqiang,
Jiao Shuhong,
Xu Dongsheng
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201903401
Subject(s) - materials science , cathode , lithium (medication) , raman spectroscopy , x ray photoelectron spectroscopy , scanning electron microscope , scanning transmission electron microscopy , chemical engineering , transmission electron microscopy , nanotechnology , composite material , chemistry , medicine , physics , engineering , optics , endocrinology
Transition metal sulfides hold promising potentials as Li‐free conversion‐type cathode materials for high energy density lithium metal batteries. However, the practical deployment of these materials is hampered by their poor rate capability and short cycling life. In this work, the authors take the advantage of hollow structure of CuS nanoboxes to accommodate the volume expansion and facilitate the ion diffusion during discharge–charge processes. As a result, the hollow CuS nanoboxes achieve excellent rate performance (≈371 mAh g −1 at 20 C) and ultra‐long cycle life (>1000 cycles). The structure and valence evolution of the CuS nanobox cathode are identified by scanning electron microscopy, transmission electron microscopy, and X‐ray photoelectron spectroscopy. Furthermore, the lithium storage mechanism is revealed by galvanostatic intermittent titration technique and operando Raman spectroscopy for the initial charge–discharge process and the following reversible processes. These results suggest that the hollow CuS nanobox material is a promising candidate as a low‐cost Li‐free cathode material for high‐rate and long‐life lithium metal batteries.