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发明公开
CN109638346A 一种SEI膜、制备方法及碱金属电池 有权

一种SEI膜、制备方法及碱金属电池
摘要：
本发明提供了一种SEI膜、制备方法及碱金属电池，所述膜原料的组成成分包括：核壳结构SiO2颗粒和电解质溶剂，以所述原料组成的总质量为100%计，所述核壳结构SiO2颗粒占所述原料组成总质量的50~80%，所述电解质溶剂占所述原料组成总质量的20~50%。本发明提供的SEI膜具有单离子迁移的特点，可以延迟空间电荷的形成，进而提高离子传输速率；另外，该SEI膜中不需要使用锂盐和钠盐，如LiPF6、LiTFSI、NaPF6、NaTFSI等，SiO2（Li+）和SiO2（Na+）颗粒就能够提供用于传导的Li+和Na+。SEI膜中的阴离子通过化学键限制在SiO2颗粒上，这有利于提高Li+或Na+的迁移数；Li+的迁移数接近1，Na+的迁移数接近1。
摘要（英）：

The invention provides an SEI film, a preparation method and an alkali metal battery. A membrane raw material comprises the following components of core-shell structure SiO2 particles and an electrolyte solvent, and based on 100% of the total mass of the raw material composition, the core-shell structure SiO2 particles account for 50-80% of the total mass of the raw material composition, and the electrolyte solvent accounts for 20-50% of the total mass of the raw material composition. The SEI film provided by the invention has the characteristic of single ion migration, and formation of spacecharges can be delayed, so that the ion transmission rate is increased. In addition, the SEI film dose not need lithium salts and sodium salts, such as LiPF6, LiTFSI, NaPF6, NaTFSI and the like, SiO2(Li < + >) and SiO2 (Na < + >) particles can provide Li < + > and Na < + > for conduction, ,. Anions in the SEI membrane are limited on SiO2 particles through chemical bonds, so that the migration number of Li < + > or Na < + > is favorably increased, and the migration number of Li < + > is close to 1, and the migration number of Na < + > is close to 1.

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