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dc.contributor.authorLiu, S.-
dc.contributor.authorMao, J.-
dc.contributor.authorZhang, L.-
dc.contributor.authorPang, W.K.-
dc.contributor.authorDu, A.-
dc.contributor.authorGuo, Z.-
dc.identifier.citationAdvanced Materials, 2021; 33(1):2006313-1-2006313-9-
dc.description.abstractPotassium-ion batteries (PIBs) are attractive for low-cost and large-scale energy storage applications, in which graphite is one of the most promising anodes. However, the large size and the high activity of K⁺ ions and the highly catalytic surface of graphite largely prevent the development of safe and compatible electrolytes. Here, a nonflammable, moderate-concentration electrolyte is reported that is highly compatible with graphite anodes and that consists of fire-retardant trimethyl phosphate (TMP) and potassium bis(fluorosulfonyl)imide (KFSI) in a salt/solvent molar ratio of 3:8. It shows unprecedented stability, as evidenced by its 74% capacity retention over 24 months of cycling (over 2000 cycles) at the 0.2 C current rate. Electrolyte structure and surface analyses show that this excellent cycling stability is due to the nearly 100% solvation of TMP molecules with K⁺ cations and the formation of FSI⁻ -derived F-rich solid electrolyte interphase (SEI), which effectively suppresses the decomposition of the solvent molecules toward the graphite anode. Furthermore, excellent performance on high-mass loaded graphite electrodes and in a full cell with perylenetetracarboxylic dianhydride cathode is demonstrated. This study highlights the importance of the compatibility of both electrolyte and the interface, and offers new opportunities to design the electrolyte-SEI nexus for safe and practical PIBs.-
dc.description.statementofresponsibilitySailin Liu, Jianfeng Mao, Lei Zhang, Wei Kong Pang, Aijun Du and Zaiping Guo-
dc.rights© 2020 Wiley-VCH GmbH-
dc.subjectF-rich solid electrolyte interphase-
dc.subjectnonflammable materials-
dc.subjectpotassium-ion batteries-
dc.subjecttrimethyl phosphate-
dc.titleManipulating the solvationstructure of nonflammable electrolyte and interface to enable uUnprecedented stability of graphite anodes beyond 2 years for safe pPotassium-ion batteries-
dc.typeJournal article-
dc.identifier.orcidLiu, S. [0000-0003-0025-998X]-
dc.identifier.orcidMao, J. [0000-0002-4787-4261]-
dc.identifier.orcidGuo, Z. [0000-0003-3464-5301]-
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