Application of additive with structure as shown in formula I in electrolyte, non-aqueous electrolyte and battery

The invention provides application of an additive with a structure as shown in a formula I in a non-aqueous electrolyte. The additive structurally comprises trimethylsilyl and ethylenedioxy, the trimethylsilyl can be combined with fluorine ions to generate trimethylsilyl-fluorine gas, the trimethylsilyl-fluorine gas is discharged through formation, generation of lithium fluoride with electrons and ions insulated is reduced, and the internal resistance of the battery is effectively reduced; ethylenedioxy captures free protons to generate ethylene glycol, so that conversion of alkyl lithium carbonate in an electrolyte interface can be promoted, and a stable solid electrolyte interface is formed; the internal resistance of the battery is reduced and the performance of the battery is improved. 本发明提供了一种具有式Ⅰ结构的添加剂在非水电解液中的应用。该添加剂结构中包括三甲基硅基与乙二氧基，其中，三甲基硅基能与氟离子结合生成三甲基硅氟气体通过化成排除，减少电子与离子绝缘的氟化锂的生成，有效降低电池内阻；乙二氧基捕获游离质子生成乙二醇能促进电解质界面中的烷基碳酸锂的转化，形成稳定的固态电解质界面；还能降低电池内阻，提升电池的性能。