Lithium salts are a critical component of lithium-ion batteries, which are widely used in electronic devices and electric vehicles due to their high energy density, long cycle life, and low self-discharge rate.

In lithium-ion batteries, lithium salts are dissolved in an organic solvent to form an electrolyte solution. The most commonly used lithium salt is lithium hexafluorophosphate (LiPF6), but other lithium salts such as Lithium bis(trifluoromethanesulfonimide (LiTFSI), Lithium Bis(fluorosulfonyl)imide (LiFSI), Lithium tetrafluoroborate (LiBF₄), Lithium difluorophosphate (LiDFP), Lithium bis(oxalate)borate (LiBOB) and Lithium difluoro(oxalato)borate (LiDFOB), etc.

The role of lithium salts in lithium-ion batteries is to provide lithium ions for the electrochemical reactions that occur during charge and discharge. During charging, lithium ions are extracted from the cathode and move through the electrolyte to the anode, where they are stored. During discharge, the lithium ions move back to the cathode, releasing energy that can be used to power devices or vehicles.