Abstract

Lithium-ion batteries (LIBs) are the cornerstone of modern energy storage, powering everything from portable electronics to electric vehicles. However, their performance remains a crucial factor for wider adoption, especially in energy-critical applications demanding exceptional longevity, stability, and power delivery. This review paper delves into the critical role of binders in optimizing LIB performance for such demanding scenarios. Despite their seemingly minor presence compared to active materials, binders significantly affect a battery's lifespan, cyclability, and rate capability. We explore the traditional and emerging binder chemistries, highlighting their strengths and limitations in the context of energy-critical applications. The focus will be on how binder properties like adhesion, mechanical strength, and ionic conductivity influence electrode integrity and ultimately, battery performance. The review will further discuss recent advancements in binder design, including multifunctional binders that not only maintain structural integrity but also offer additional functionalities like improved conductivity or enhanced electrode stability. The potential of bio-derived and selfhealing binders for sustainable and resilient batteries will be addressed. Finally, the paper will explore the remaining challenges and future directions in binder research for energy-critical LIBs. This includes strategies for optimizing binder-electrode interactions, tailoring binder properties for specific high-performance electrode materials, and mitigating the impact of binders on overall battery energy density. By providing a comprehensive overview of the role of binders in LIB performance for energy-critical applications, this review aims to guide researchers towards developing next-generation binders that unlock the full potential of Li-ion battery technology.