Physics and Chemistry of Li-ion Rechargeable Batteries

Understanding the physics and chemistry of Li-ion batteries (LIBs) is crucial for harnessing their potential as a pivotal technology in the transition toward cleaner and more efficient energy storage solutions. This chapter provides a broad overview of the fundamental principles inherent in LIB operation. LIBs have become most popular in modern life, powering everything from smartphones to electric vehicles. Thus, understanding the physics and chemistry of LIBs becomes essential for better addressing the associated issues and challenges. This chapter begins by delving into the critical components of the LIBs, including the anode, cathode, electrolyte, and separator, explaining their roles in the electrochemical processes. Further, it explores the electrochemical reactions involved during galvanostatic discharging and charging cycles, illuminating Li+ movement between the cathode and anode. The chapter also emphasizes the factors affecting electrochemical potential, capacity, energy density, and open circuit voltage. The commercially available different designs of the LIBs cell are also discussed together with the safety considerations, emphasizing the importance of mitigating risks associated with LIBs. This chapter lays the groundwork for a deeper exploration of Li-ion battery technology, paving the way for subsequent chapters that delve into advanced concepts and practical applications. Finally, it includes the significant challenges for the LIBs at present and future perspectives or developments toward mitigating the associated challenges.