A high-concentrated and nonflammable electrolyte for potassium ion-based dual-graphite batteries
作者机构:College of Materials and ChemistryChina Jiliang UniversityHangzhou 310018China Liangxin CollegeChina Jiliang UniversityHangzhou 310018China
出 版 物:《Nano Research》 (纳米研究(英文版))
年 卷 期:2023年第16卷第5期
页 面:6353-6360页
核心收录:
学科分类:0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程(可授工学、理学学位)] 0703[理学-化学]
基 金:the National Natural Science Foundation of China(Nos.52002081 51972294 and 51872271)
主 题:dual-ion batteries graphite high voltage high-concentrated electrolytes phosphates
摘 要:Potassium ion-based dual-graphite batteries(KDGBs)emerge as promising devices for large-scale applications due to their high voltage,low cost,environmental ***,conventional KPF6/carbonate-based electrolytes suffer from severe oxidation decomposition,low concentration,flammability,which limit the capacity and cyclability of ***,a nonflammable potassium bis(fluorosulfonyl)imide/triethyl phosphate(KFSI/TEP)electrolyte was designed for *** the salt-to-solvent molar ratio increases to 1:1.3,graphite cathode operated at the cut-off potential of 5.2 V exhibits much enhanced capacity,excellent rate capability(26.4 mAh∙g^(−1) at 1.0 A∙g^(−1)),superior cyclability with 98%capacity retention after 350 *** compounds-rich electrode/electrolyte interphase layers derived from the preferential decomposition of FSI−anions ensure good compatibility of the 1:1.3 KFSI/TEP electrolyte with K metal and graphite *** on this electrolyte,asassembled KDGBs show high operation voltage of 4.3 V and good cycling *** work provides feasibility for developing long-life and safe-operation DGBs.