Abstract: An electrolyte additive, an electrolyte, and a lithium-ion battery, where the electrolyte additive has a structure shown in formula (I): The electrolyte additive has both a film-forming property and the property of inhibiting the rise of acidity and chromaticity of the electrolyte, thereby effectively improving the cycle performance of the battery.

Abstract: Provided are a bissulfonate compound, a preparation method therefor, an electrolytic solution and an energy storage device. The bissulfonate compound has a structure of (I) and is applied as an additive to an energy storage device, so that a stable SEI film can be formed on a surface of an anode of the energy storage device, and the decomposition of a solvent in the electrolytic solution can be suppressed. As the stable SEI film can be formed on the surface of the anode, lithium ions can be smoothly embedded and disembedded at a low temperature, thereby improving the low-temperature performance of the energy storage device.

Abstract: The present invention relates to the technical field of secondary lithium-ion batteries, specifically, provided in the present invention are a secondary lithium-ion battery electrolyte solution for reducing battery resistance and a secondary lithium-ion battery. The present invention, in a first aspect, provides the electrolyte solution for the secondary lithium-ion battery, comprising a non-aqueous solvent, a lithium salt and an additive, where the additive comprises a sulfonate compound. The secondary lithium-ion battery electrolyte solution and the secondary lithium-ion battery provided in the present invention have reduced resistance and improved low-temperature performance, high-temperature performance, and cycle life.

Abstract: A lithium secondary battery electrolyte for reducing internal resistance of a battery and a lithium secondary battery. The electrolyte comprises a non-aqueous organic solvent, a lithium salt and an additive. The additive comprises a sulfimide compound. The sulfimide compound can significantly reduce the internal resistance of a battery. The low temperature cycle, large rate normal temperature cycle, high temperature cycle, and expansion after high temperature storage have been significantly improved.