Functional Polymers for Silicon Anodes from Liquid to Solid Electrolyte Batteries

Due to its high theoretical capacity of 3579 mAh g −1 , silicon has emerged as a promising next‐generation anode material for high‐capacity lithium‐ion batteries, aiming to meet the growing demand for high energy density electrochemical energy storage devices. However, challenges such as a 280% volume increase during lithiation, low electronic and ionic conductivities, and unstable solid electrolyte interphase severely hinder its practical implementation. Polymers, with their versatility and tailored properties, play a crucial role in addressing these challenges, although their use varies considerably depending on the type of electrolyte used in the battery. This review categorizes selected polymers into three parts based on their function and use location in batteries with a silicon anode: polymer binders, polymer modifiers, and polymer electrolytes. The physical and chemical properties required for the intended function of the polymers with silicon anodes are explored for liquid, polymer, and solid electrolyte batteries. Promising future research directions for silicon anodes combined with polymers are also highlighted.