ELECTROLYTIC SOLUTION, LITHIUM-ION BATTERY, BATTERY MODULE, BATTERY PACK AND DEVICE

This application relates to the field of batteries, and in particular, to an electrolytic solution and a lithium-ion battery, a battery module, a battery pack and an apparatus that adopt the electrolytic solution. This application provides an electrolytic solution, including an electrolyte and a solvent, and further including an additive A and an additive B. The additive A is selected from at least one of compounds whose chemical structural formula is denoted by Formula I, and the additive B is selected from at least one of compounds whose chemical structural formula is denoted by Formula II. In the electrolytic solution provided in this application, the additive A and the additive B are introduced into the electrolytic solution of a lithium-ion battery. By using the additive A and the additive B together, this application enables films to be formed on surfaces of a positive electrode plate and a negative electrode plate concurrently, and enables formation of a highly polymerized, highly ordered, low-resistance tough meshed organic film on the surface of the negative electrode, thereby significantly improving cycle performance and high-temperature storage performance of the lithium-ion battery, and also ensuring excellent kinetic performance of the lithium-ion battery.