电解质
材料科学
化学工程
枝晶(数学)
阳极
电化学窗口
锂(药物)
聚合物
准固态
电池(电)
快离子导体
阴极
电化学
电极
金属锂
法拉第效率
离子电导率
化学
复合材料
内分泌学
物理化学
工程类
功率(物理)
物理
医学
量子力学
色素敏化染料
数学
几何学
作者
Yu Xue,Wei Xiong,Tao Huang,Xiaoyan Li,Yaqi Lei,Yongliang Li,Xiangzhong Ren,Jianneng Liang,Xiaoping Ouyang,Qianling Zhang,Jianhong Liu
标识
DOI:10.1016/j.apsusc.2021.150899
摘要
• Liquid-like SN/LiTFSI mixture enables 3P to prepare stable gel electrolyte. • GPEs achieved excellent flexibility and high electrochemical performance at RT. • Adding FEC helps GPEs to uniformly deposit lithium ions on the lithium surface. • SSLMBs exhibit long cycled performance with LiFePO 4 and NCM811 as cathodes. Solid-state lithium metal batteries (SSLMBs) are promising candidates for the application in electric vehicles (EVs) because of their higher energy density and safer properties compared to the traditional liquid organic electrolyte-based lithium-ion batteries (LIBs). However, SSLMBs with solid polymer electrolyte (SPE) suffer from the serious lithium dendrite problem, which results in the poor cycling performance and the short circuit of batteries. In this work, a thin and flexible blended gel polymer electrolyte (GPE) was prepared for dendrite free SSLMBs. The as-prepared GPE has a strong strain at 529.94 ± 10%, a high ion transference number ( t Li+ ) of 0.66, and a wide electrochemical window of 5.23 V (vs. Li + /Li). Mechanism study shows that the addition of fluoroethylene carbonate (FEC) into the GPE promotes the formation of LiF-coating solid electrolyte interphase (SEI). As a result, a stable GPE/Li-metal interface and dendrite-free SSLMB was achieved. Moreover, the solid-state battery with Li-metal anode, as-prepared SPE and LiFePO 4 can deliver a specific capability of 150 mAh g −1 and a capacity retention of 94.8 % after 500 cycles at 0.3C, 20 ℃.
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