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Dendrite-Free, Wide Temperature Range Lithium Metal Batteries Enabled by Hybrid Network Ionic Liquids
Dendrite-Free, Wide Temperature Range Lithium Metal Batteries Enabled by Hybrid Network Ionic Liquids
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机译:无树枝状,宽温度范围锂金属电池,由混合网离子液体启用
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摘要
Ionic liquid N-methyl-N-propyl-pyrrolidinium bis(fluorosulfonyl)imide (Pyr13FSI) was introduced into a hybrid network to obtain a series of gel polymer electrolytes (GPEs). Mechanical and electrochemical properties of the GPEs were tuned through controlling the network structure and ionic liquid contents, and ionic conductivity higher than 1 mS cm−1 at room temperature was achieved. The newly developed GPEs are flame-retardant and show excellent thermal and electrochemical stability as well as ultra-stability with lithium metal anode. Symmetrical lithium cells with the GPEs exhibit a stable cycling over 6800 h at a current density of 0.1 mA cm−2 and stable lithium stripping-plating at 1 mA cm−2, the highest current density reported for ionic liquid-based GPEs. Moreover, Li/LiFePO4 batteries with the obtained GPEs exhibit desirable cycling stability and rate performance over a wide temperature range from 0° C. to 90° C.
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