再分配(选举)
导线
离子键合
电荷(物理)
电池(电)
材料科学
离子势
化学物理
电气工程
工程物理
原子物理学
离子
物理
工程类
热力学
复合材料
政治学
功率(物理)
量子力学
政治
法学
作者
Huiqin Lian,Xinyu Hu,Dengyi Xiong,Shusheng Tao,Bin Zhong,Song Bai,Wentao Deng,Hongshuai Hou,Guoqiang Zou,Xiaobo Ji
摘要
Solid polymer electrolytes (SPEs) have been regarded as hopeful candidate electrolyte for solid-state lithium battery. However, the low Li+ transfer number and poor interface stability pose great challenges for the high rate capability of SPE. Herein, inspired from the density functional theory (DFT) calculations that local positive charge distribution can be regulated by introducing strong electron-withdrawing groups, which can selectively anchor TFSI-, largely enhance the Li+ migration number. As predicted, the obtained CPE-NO2 deliver a remarkable Li+ transfer number of 0.92, equal to a single-ion conductor for Li+, largely high than that of the SPE (0.31), according well with the molecular dynamics (MD) simulations and pyridine complexation experiments. Furthermore, the PEO||Li interfacial stability, flame retardant ability, and mass transfer of Li+ in interface can also be largely enhanced by interfacial by-product, which are fast Li+ conductors according to TOF-SIMS results. Impressively, the Li|CPE-NO2|Li cell exhibit superior cyclability for 2200 h at 0.1 mA cm-2, and the solid LFP|CPE-NO2|Li battery delivers prominent capacity of 127.4 mAh g-1 at a high rate 5 C (12 mins). This work breaks the fast charge limitation of solid lithium battery, and provides a feasible approach for the construction of advanced solid electrolyte.
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