Stabilizing BiOCl/Ti3C2Tx hybrids for potassium-ion batteries via solid electrolyte interphase reconstruction
Inorganic Chemistry Frontiers(2022)
摘要
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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