Insight into high-entropy oxides as anodes, cathodes, and solid-state electrolytes for advancing Li-ion batteries: A comprehensive review

Increased dependency on energy storage devices for electric vehicles and portable devices has led to the development of new materials. The development of a new class of materials for efficient and sustainable batteries has taken center stage in the field of material development. In this context, this review focuses on a new class of high-entropy oxides (HEOs) that can be used as anodes, cathodes, and solid-state electrolytes (SSE) for Li-ion batteries. HEOs offer immense potential as next-generation battery materials due to their unique ability to tailor their properties as needed, making them superior candidates for all types of energy storage systems, including those utilizing sodium ions, zinc ions, potassium ions, and supercapacitors. This review highlights the basic configuration and fundamental requirements for entropy effects. Additionally, the transformative potential of HEOs in anodes, cathodes, and solid-state electrolytes with different crystal structures has been discussed, providing a comprehensive picture through detailed exploration. This work focuses on exploring the importance of HEOs in providing future technologies supporting clean and renewable energy initiatives. The integration of HEO-based electrodes and electrolytes offers a promising pathway toward safe, durable, and high-performance lithium-ion and all-solid-state batteries. With continued interdisciplinary collaboration and industrial-scale process development, HEOs are poised to emerge as competitive and sustainable alternatives to conventional transition metal oxide materials. Continued advances in structure–property understanding, scalable synthesis, and integrated electrode–electrolyte design will be pivotal in translating HEOs from promising laboratory materials to commercially viable energy storage technologies. • Basic understanding of the structure of HEOs and the 4 core effects • Comprehensive review on electrodes and solid electrolyte • Future scope of HEOs in the field of Li-ion energy storage