Electrolyte and lithium ion battery

The invention relates to an electrolyte and a lithium ion battery, and mainly solves the problem that an existing lithium ion battery is poor in cycle performance and high-temperature performance under high-voltage and wide-temperature conditions. According to the electrolyte, one or more of substances shown as the structural formula # imgabs0 # are added into the electrolyte, R1 and R2 are independently selected from substituted or unsubstituted alkyl, substituted or unsubstituted alkoxy, halogeno, nitrile group or substituted or unsubstituted phenyl, the internal resistance of the lithium ion battery is reduced, and meanwhile, the normal-temperature and high-temperature cycle performance of the lithium ion battery is improved. 本发明涉及一种电解液及锂离子电池，主要解决了现有的锂离子电池在高电压、宽温条件下循环性能和高温性能不佳的问题。本发明通过向电解液中添加结构式#imgabs0#所示物质中的一种或多种，其中，R1、R2独立地选自取代或未取代的烷基、取代或未取代的烷氧基、卤代基、腈基或取代或未取代的苯基，在降低锂离子电池内阻的同时，提升了锂离子电池的常温以及高温循环性能。