Nonaqueous Battery Electrolyte Additives for Si Anode Cycle Stability

A silane compound with specific structure (containing Si atom and unsaturated bond) is introduced as an intermediary substance in the electrolyte. This compound mediates between the Si-based negative electrode and the electrolyte, forming a stable interface layer that prevents direct harmful interactions while allowing lithium ion transport, thus improving both capacity retention and cycle life

The chemical composition and molecular structure parameters of the electrolyte are specifically modified by incorporating silane compounds with unsaturated bonds. This parameter change enables the formation of a stable solid electrolyte interface (SEI) layer on the Si-based electrode, which maintains structural integrity during cycling and suppresses electrode degradation

The silane compound with unsaturated bond provides localized protection at the electrode-electrolyte interface. The unsaturated bond specifically reacts to form a stable interface layer with different properties than bulk electrolyte, creating local quality differentiation that suppresses both degradation and gas generation at the critical interface region

The electrolyte is formulated as a composite system combining conventional electrolyte components with specifically structured silane compounds. This composite electrolyte leverages the benefits of both conventional electrolytes (ion conductivity) and silane compounds (interface stability, gas suppression) to achieve multiple performance improvements simultaneously