期刊
INORGANIC CHEMISTRY FRONTIERS
卷 9, 期 13, 页码 3165-3175出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2qi00640e
关键词
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资金
- National Natural Science Foundation of China [52071137, 51977071, 51802040, 21802020]
- Science and Technology Innovation Program of Hunan Province [2021RC3066, 2021RC3067]
- Natural Science Foundation of Hunan Province [2020JJ3004, 2020JJ4192]
- Fundamental Research Funds for the Central Universities
This study proposes a two-dimensional van der Waals heterostructure with bismuth oxychloride nanosheets anchored on MXene nanosheets, which improves the performance of anode materials for potassium-ion batteries through reasonable material design and electrolyte optimization. The composite material shows high reversible specific capacity and cycling stability, providing important insights for the development of stable high-performance PIB anodes.
Synergistic innovation from reasonable material design to electrolyte optimization is the key to improving the performance of anode materials for potassium-ion batteries (PIBs). In this work, a two-dimensional van der Waals heterostructure with bismuth oxychloride (BiOCl) nanosheets anchored on MXene (Ti3C2Tx) nanosheets is investigated using a high-concentration potassium bis(fluorosulfonyl)imide (KFSI)-dimethoxyethane (DME) electrolyte. BiOCl nanosheets offer a high potassium-ion storage capacity, while Ti3C2Tx nanosheets provide a fast potassium-ion diffusion channel and alleviate the volume expansion of BiOCl during repeated potassiation/depotassiation. In addition, according to the experimental and computational results, the high-concentration KFSI-DME electrolyte enables the formation of a uniform F-rich inorganic solid electrolyte interphase (SEI) film on the surface of the anode material. As a result, the composite delivers a reversible specific capacity of 262 mA h g(-1) at 50 mA g(-1), and retains a capacity of 145 mA h g(-1) after 100 cycles at 500 mA g(-1). This work is expected to provide some enlightenment for the development of stable anodes for high-performance PIBs.
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