戴雨晴博士论文“Customized Li+ Solvation Sheath at PEO-Based Electrolyte/Ultrahigh-Nickel Cathode Interface toward Room-Temperature Solid-State Lithium Batteries”被ACS Nano接收发表
发布时间：2024-08-13
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The matching of poly (ethylene oxide) (PEO)-based electrolytes with ultrahigh-nickel cathode materials is crucial for the design of a new-generation high-energy-density solid-state lithium metal batteries (SLMBs), but it is limited by serious interfacial side reactions between PEO and ultrahigh-nickel materials. Here, a high-concentration electrolyte (HCE) interface with a customized Li+ solvation sheath is constructed between the cathode and the electrolyte. It induces the formation of anion-regulated robust cathode-electrolyte interphase (CEI), reduces the unstable free-state solvent, and finally achieves the compatibility of PEO-based electrolytes with ultrahigh-nickel cathode materials. Meanwhile, the corrosion of Al current collector caused by lithium bis(trifluoromethanesulfonyl)imide ions (LiTFSI) is prevented by lithium difluoro(oxalato)borate ions (LiDFOB), the synergistic effect of the double lithium salt is achieved by a well-tailored ratio of TFSI- and DFOB- in the first solvation sheath of Li+. Impressively, compared with all reported PEO-based SLMBs matched with ultrahigh-nickel (Ni ≥ 90%) cathodes, the SLMB in this work delivers an unprecedented discharge specific capacity of 216.4 mAh g-1 (0.1 C) even at the room temperature. Originally, this work points out a novel direction to optimizing cathode/electrolyte interface.
Article Link：https://pubs.acs.org/doi/10.1021/acsnano.4c07997
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