Lithium secondary battery electrolyte and lithium secondary battery

The invention belongs to the technical field of lithium secondary batteries, and relates to a lithium secondary battery electrolyte. The lithium secondary battery electrolyte contains an additive, and the additive comprises 2, 3-dihydropyrido [2, 3-d] [1, 3] azole-2-ketone and a derivative thereof; the electrolyte has excellent electrical properties such as cycle performance and storage performance under the conditions of high temperature and high voltage. Meanwhile, the invention also provides a lithium secondary battery. 本发明属于锂二次电池技术领域，具体涉及本发明公开了一种锂二次电池电解液，含有添加剂，所述添加剂包括2,3-二氢吡啶并[2,3-d][1,3]唑-2-酮及其衍生物。该电解液在高温、高电压情况下的循环性能、存储性能等电学性能优异。同时，本发明还提供了一种锂二次电池。