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001024808 0247_ $$2doi$$a10.1021/acsnano.3c06368
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001024808 1001_ $$0P:(DE-HGF)0$$aGao, Ping$$b0
001024808 245__ $$aUltrastable Dendrite-Free Potassium Metal Batteries Enabled by Weakly-Solvated Electrolyte
001024808 260__ $$aWashington, DC$$bSoc.$$c2023
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001024808 520__ $$aPotassium (K) metal is considered one of the most promising anodes for potassium metal batteries (PMBs) because of its abundant and low-cost advantages but suffers from serious dendritic growth and parasitic reactions, resulting in poor cyclability, low Coulombic efficiency (CE), and safety concerns. In this work, we report a localized high-concentration electrolyte (LHCE) consisting of potassium bis(fluorosulfonyl)imide (KFSI) in a cosolvent of 1,2-dimethoxyethane (DME) and 1,1,2,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE) to solve the problems of PMBs. TTE as a diluent not only endows LHCE with advantages of low viscosity, good wettability, and improved conductivity but also solves the dendrite problem pertaining to K metal anodes. Using the formulation of LHCE, a CE of 98% during 800 cycles in the K||Cu cell and extremely stable cycling of over 2000 h in the K||K symmetric cell are achieved at a current density of 0.1 mA cm–2. In addition, the LHCE shows good compatibility with a Prussian Blue cathode, allowing almost 99% CE for the K||KFeIIFeIII(CN)6 full cell during 100 cycles. This promising electrolyte design realizes high-safety and energy-dense PMBs.
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001024808 7001_ $$0P:(DE-HGF)0$$aZhang, Fei$$b1
001024808 7001_ $$0P:(DE-HGF)0$$aWang, Xingchao$$b2$$eCorresponding author
001024808 7001_ $$0P:(DE-HGF)0$$aWu, Miaomiao$$b3
001024808 7001_ $$0P:(DE-HGF)0$$aXiang, Qian$$b4
001024808 7001_ $$0P:(DE-Juel1)180575$$aYang, Aikai$$b5$$ufzj
001024808 7001_ $$0P:(DE-HGF)0$$aSun, Ying$$b6
001024808 7001_ $$0P:(DE-HGF)0$$aGuo, Jixi$$b7
001024808 7001_ $$0P:(DE-HGF)0$$aHuang, Yudai$$b8
001024808 773__ $$0PERI:(DE-600)2383064-5$$a10.1021/acsnano.3c06368$$gVol. 17, no. 20, p. 20325 - 20333$$n20$$p20325 - 20333$$tACS nano$$v17$$x1936-0851$$y2023
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