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Co‐Construction of Sulfur Vacancies and Heterojunctions in Tungsten Disulfide to Induce Fast Electronic/Ionic Diffusion Kinetics for Sodium‐Ion Batteries
Author(s) -
Li Yu,
Qian Ji,
Zhang Minghao,
Wang Shuo,
Wang Zhaohua,
Li Maosheng,
Bai Ying,
An Qinyou,
Xu Huajie,
Wu Feng,
Mai Liqiang,
Wu Chuan
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202005802
Subject(s) - materials science , electrochemistry , molybdenum disulfide , chemical engineering , tungsten disulfide , anode , ionic bonding , electrochemical kinetics , composite number , sulfide , nanocomposite , electrode , nanotechnology , ion , composite material , chemistry , physics , quantum mechanics , engineering , metallurgy
Engineering novel electrode materials with unique architectures has a significant impact on tuning the structural/electrochemical properties for boosting the performance of secondary battery systems. Herein, starting from well‐organized WS 2 nanorods, an ingenious design of a one‐step method is proposed to prepare a bimetallic sulfide composite with a coaxial carbon coating layer, simply enabled by ZIF‐8 introduction. Rich sulfur vacancies and WS 2 /ZnS heterojunctions can be simultaneously developed, that significantly improve ionic and electronic diffusion kinetics. In addition, a homogeneous carbon protective layer around the surface of the composite guarantees an outstanding structural stability, a reversible capacity of 170.8 mAh g −1 after 5000 cycles at a high rate of 5 A g −1 . A great potential in practical application is also exhibited, where a full cell based on the WS 2− x /ZnS@C anode and the P2‐Na 2/3 Ni 1/3 Mn 1/3 O 2 cathode can maintain a reversible capacity of 89.4 mAh g −1 after 500 cycles at 1 A g −1 . Moreover, the underlying electrochemical Na storage mechanisms are illustrated in detail by theoretical calculations, electrochemical kinetic analysis, and operando X‐ray diffraction characterization.