Perfluoroinated Ionomer as an Artificial SEI for Silicon Nano-Flake Anode in LiTFSI/Tetraglyme Solvate Ionic Liquid
Perfluoroinated Ionomer as an Artificial SEI for Silicon Nano-Flake Anode in LiTFSI/Tetraglyme Solvate Ionic Liquid
复制标题
全氟离聚物作为 LiTFSI/四甘醇二甲醚溶剂化离子液体中硅纳米片阳极的人工 SEI
DOI：
10.1149/1945-7111/ac4e59
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发表时间：
2022
影响因子：
3.9
通讯作者：
Inaba Minoru
中科院分区：
文献类型：
--
作者：
Haruta Masakazu;Konaga Hiroto;Doi Takayuki;Inaba Minoru
硅纳米薄片粉末（LeafPower® Si）阳极的循环性能通过涂覆全氟磺酸（PFSA）聚合物（Nafion®和Aquivion®）作为人造固体电解质中间相（SEI）来改善。通过将PFSA离聚物溶液添加到Si复合电极的水性浆料中，用PFSA离聚物涂覆Si电极。H+型Nafion®涂覆的Si电极由于形成由Nafion®的还原分解产物组成的富含LiF的SEI而表现出改善的容量保持率和库仑效率。Nafion®涂层抑制了极化的增加和循环时的电极膨胀，因为富含LiF的SEI有效地抑制了电解质分解。Li+和Cs+型Nafion®和H+型Aquivion®（其具有比Nafion®更短的侧链）对Si电极的循环性能提供了类似的积极效果。此外，由于Nafion®涂层和氟代碳酸亚乙酯（FEC）的SEI形成添加剂的协同作用，Si电极实现了高达500次循环的良好循环能力。
Cycle performance of silicon nano-flake powder (LeafPower® Si) anodes was improved by coating of perfluorosulfonic acid (PFSA) polymers (Nafion® and Aquivion®) as an artificial solid electrolyte interphase (SEI). The Si electrodes were coated with PFSA ionomer by addition of PFSA ionomer solution to aqueous slurry of the Si composite electrode. H+-type Nafion®-coated Si electrodes demonstrated improved capacity retentions and Coulombic efficiencies owing to the formation of a LiF-rich SEI composed of reductive decomposition products of Nafion®. The Nafion® coating suppressed the increase in polarization and the electrode swelling upon cycling because the LiF-rich SEI effectively suppressed electrolyte decomposition. Li+ and Cs+-type Nafion® and H+-type Aquivion®, which has a shorter side chain than Nafion®, provided similar positive effects on cycle performance of the Si electrodes. Furthermore, the Si electrodes achieved good cycleability up to 500 cycles owing to synergy effects of the Nafion® coating and an SEI-forming additive of fluoroethylene carbonate (FEC).