Electrolyte additive, electrolyte and energy storage device

• Main Authors: SUN JIEYAN, CHEN JIE, MA BIN, LI TAO
• Format: Patent
• Language: Chinese; English
• Published: 08.04.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to an electrolyte additive. The electrolyte additive comprises a silicon-containing compound and a fluorine-containing compound, the silicon-containing compound is selected from one or more of compounds with structural characteristics as shown in the following formula (I); the fluorine-containing compound is selected from one or more of fluoroethylene carbonate, fluorocarboxylate with the carbon atom number of 2-7 and fluoroether with the carbon atom number of 2-7. The electrolyte additive can effectively prolong the cycle life of an energy storage device and improve the high-temperature storage performance of the energy storage device. 本发明涉及一种所述电解液添加剂的组成包括含硅化合物和含氟化合物；所述含硅化合物选自具有如下式(I)所示结构特征的化合物中的一种或多种；所述含氟化合物选自氟代碳酸乙烯酯、碳原子数为2～7的氟代羧酸酯和碳原子数为2～7的氟代醚中的一种或多种。所述电解液添加剂能够有效改善储能器件的循环寿命，并提升其高温存储性能。