Polymer electrolytes for enhanced mechanical integrity in lithium-ion batteries: a review of recent progress and future directions

Abstract

The increasing demand for energy systems that are flexible, lightweight, and durable has generated interest in solid polymer electrolytes. Typically, conventional lithium-ion batteries use carbonate-containing liquid electrolytes, which are flammable and pose safety concerns. In contrast, solid electrolytes offer mechanical reliability, environmental sustainability, and enhanced safety. This review examines the mechanical properties of solid polymer electrolytes in recent battery applications. Various electrolyte compositions and processing techniques were examined, including incorporating polymer composites and additives to enhance mechanical properties. The review also discusses the characterization of polymer electrolytes using instruments such as a nanoindenter and a universal testing machine, which enable the evaluation of tensile, flexural, and viscoelastic properties. By understanding and improving the mechanical properties of solid polymer electrolytes, it is possible to develop safer and more efficient energy storage systems.