Lithium-salt monohydrate melt: A stable electrolyte for aqueous lithium-ion batteries
Lithium-salt monohydrate melt: A stable electrolyte for aqueous lithium-ion batteries
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DOI：
10.1016/j.elecom.2019.106488
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发表时间：
2019-07-01
影响因子：
5.4
通讯作者：
Yamada, Atsuo
中科院分区：
文献类型：
--
作者：
Ko, Seongjae;Yamada, Yuki;Yamada, Atsuo
浓缩水系电解质由于其宽电位窗而有望用于高电压和安全的水系锂离子电池。对于Li体系，室温二水合物熔体（27.8 mol kg(-1)）已被证明可以作为稳定的水性电解质，但由于Li盐的溶解度有限，尚未发现更浓缩的电解质。在这里，我们报道了一种室温一水合物熔体的锂盐（55.5 mol kg(-1)）作为浓缩水性电解质的最终系统。它是通过采用具有不对称酰亚胺阴离子的锂盐而发现的，该阴离子在水中表现出超高溶解度。一水合物熔融电解质凭借其显着提高的钝化能力，提供了类似于 5 V 的宽电位窗口，首次实现了铝在水性电解质中的锂合金化反应。
Concentrated aqueous electrolytes are promising for high-voltage and safe aqueous lithium-ion batteries because of their wide potential window. For Li system, a room-temperature dihydrate melt (27.8 mol kg(-1)) has been demonstrated to function as a stable aqueous electrolyte, but more concentrated electrolytes have yet to be discovered due to the limited solubility of Li salts. Here we report a room-temperature monohydrate melt of Li salts (55.5 mol kg(-1)) as an ultimate system of concentrated aqueous electrolytes. It has been discovered by adopting a Li salt with an asymmetric imide anion that shows ultra-high solubility in water. The monohydrate-melt electrolyte provides a wide potential window of similar to 5 V based on its dramatically improved passivation ability, which, for the first time, enables the Li-alloying reaction of Al in aqueous electrolytes.