Fundamental Understanding and Optimization Strategies for Dual-Ion Batteries: A Review

There has been increasing demand for high-energy density and long-cycle life rechargeable batteries to satisfy the ever-growing requirements for next-generation energy storage systems. Among all available candidates, dual-ion batteries (DIBs) have drawn tremendous attention in the past few years from both academic and industrial battery communities because of their fascinating advantages of high working voltage, excellent safety, and environmental friendliness. However, the dynamic imbalance between the electrodes and the mismatch of traditional electrolyte systems remain elusive. To fully employ the advantages of DIBs, the overall optimization of anode materials, cathode materials, and compatible electrolyte systems is urgently needed. Here, we review the development history and the reaction mechanisms involved in DIBs. Afterward, the optimization strategies toward DIB materials and electrolytes are highlighted. In addition, their energy-related applications are also provided. Lastly, the research challenges and possible development directions of DIBs are outlined.

Automated summary

There is a growing demand for rechargeable batteries with high-energy density and long-cycle life to meet the requirements of next-generation energy storage systems. Dual-ion batteries (DIBs) have attracted significant attention due to their advantages of high working voltage, safety, and environmental friendliness. However, the imbalance between electrodes and the mismatch of electrolyte systems pose challenges. Therefore, overall optimization of anode materials, cathode materials, and compatible electrolyte systems is urgently needed to fully exploit the advantages of DIBs.