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Enhancing the Electrochemical Performance of Sodium‐Ion Batteries by Building Optimized NiS~2~/NiSe~2~ Heterostructures by Shu‐Ang He; Zhe Cui; Qian Liu; Guanjie He; Dan J. L. Brett; Wei Luo; Rujia Zou; Meifang Zhu is a Engineering article available to read on EtoBox.
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## Abstract NiS~1.23~Se~0.77~ nanosheets closely attached to the internal surface of hollow mesoporous carbon sphere (HMCS) to form a NiS~1.23~Se~0.77~ nanosheets embedded in HMCS (NSSNs@HMCS) composite as the anode of sodium ion batteries (SIBs) is reported by a facile synthesis route. The anode exhibits a superior reversible capacity (520 mAh g^−1^ at 0.1 A g^−1^)~,~ impressive coulombic efficiency (CE) of up to 95.3%, a high rate capacity (353 mAh g^−1^ at 5.0 A g^−1^), excellent capacity retention at high current density (95.6%), and high initial coulombic efficiency (ICE) (95.1%). Firstly, the highest ICE for NiS~2~/NiSe~2~‐based anode can be ascribed to ultrathin layered structure of NiS~1.23~Se~0.77~ nanosheet and highly efficient electron transfer between the active material and HMCS. Secondly, the optimized NiS~2~/NiSe~2~ heterostructure at the nanoscale of the inside HMCS is formed after the first discharge/charge cycles, which can provide rich heterojunction interfaces/boundaries of sulfide/selenides to offer faster Na^+^ pathways, decrease the Na^+^ diffusion barriers, increase electronic conductivity, and limit the dissolution of polysulfides or polyselenides in the el
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- Author
- Shu‐Ang He; Zhe Cui; Qian Liu; Guanjie He; Dan J. L. Brett; Wei Luo; Rujia Zou; Meifang Zhu
- Publisher
- Wiley
- Published
- 2021
- Language
- EN
- Field
- Engineering (Physical Sciences)