Ni-rich cathode evolution: exploring electrochemical dynamics and strategic modifications to combat degradation

Nickel (Ni)-rich cathode materials hold immense promise for high-energy-density lithium-ion batteries (LIBs), yet their widespread deployment is hampered by significant challenges related to structural and interfacial degradation. These include rapid capacity fading, which diminishes their long-term performance, and the risk of thermal runaway caused by crystal disintegration, leading to safety concerns. Additionally, interfacial instability poses a hurdle to the widespread adoption of these cathodes in commercial applications. Addressing these issues is crucial for the successful commercialization of layered Ni-rich cathodes in energy storage systems. This paper provides a comprehensive analysis of the electrochemical dynamics underlying the degradation mechanisms in Ni-rich cathodes and explores innovative modification strategies to mitigate these issues. Through an in-depth investigation, we uncover the intricate processes leading to voltage fade, capacity decay, and structural instability. Utilizing advanced characterization techniques, including in situ and operando methodologies, we gain real-time insights into the degradation mechanisms. Furthermore, this study delves into cutting-edge modification strategies, such as surface coatings, doping techniques, and nano-structuring approaches, aimed at enhancing the stability of Ni-rich cathode materials. By synthesizing knowledge from electrochemical dynamics and innovative modification strategies, this research contributes valuable insights for the development of high-performance and long-lasting LIBs, essential for the future of energy storage and electric transportation technologies.