Lithium Battery Electrolyte Additives for High-Temperature Cycle Life

The patent modifies the chemical composition parameters of the electrolyte by introducing specific additives (first additive with isocyanate groups and second additive with electron-withdrawing groups) to change the chemical environment at the electrode interface. This parameter change enables the electrolyte to form stable protective films that prevent resistance increase and maintain cycle life at high temperatures

The patent creates a composite electrolyte system by combining multiple components: non-aqueous organic solvent, lithium salt, first additive (isocyanate-containing compound), and second additive (compound with electron-withdrawing groups). This composite formulation works synergistically to suppress resistance increase and improve high-temperature cycle life characteristics

The patent changes the chemical parameters of the electrolyte by incorporating specific functional groups (isocyanate groups in the first additive and electron-withdrawing groups in the second additive) that modify the electrochemical behavior at high temperatures. These parameter changes suppress unwanted side reactions that lead to gas generation during high-temperature storage

The patent converts the potentially harmful high-temperature environment into a beneficial condition by using the heat to promote the formation of stable protective films through the additive components. The high temperature accelerates the formation of stable SEI layers that actually protect against further degradation and gas generation