Recent Advances in 2D Heterostructures as Advanced Electrode Materials for Potassium-Ion Batteries

Owing to the cost-effectiveness, Earth abundance, and suitable redox potential, potassium-ion batteries (PIBs) stand out as one of the best candidates for large-scale energy storage systems. However, the large radius of K+ and the unsatisfied specific capacity are the main challenges for their commercial applications. To address these challenges, constructing heterostructures by selecting and integrating 2D materials as host and other materials as guest are proposed as an emerging strategy to obtain electrode materials with high capacity and long lifespan, thus improving the energy storage capability of PIBs. Recently, numerous studies are devoted to developing 2D-based heterostructures as electrode materials for PIBs, and significant progress is achieved. However, there is a lack of a review article for systematically summarizing the recent advances and profoundly understanding the relationship between heterostructure electrodes and their performance. In this sense, it is essential to outline the promising advanced features, to summarize the electrochemical properties and performances, and to discuss future research focuses about 2D-based heterostructures in PIBs.

Automated summary

Potassium-ion batteries (PIBs) are considered as one of the best options for large-scale energy storage systems due to their cost-effectiveness, Earth abundance, and suitable redox potential. However, the challenges of large K+ radius and unsatisfied specific capacity hinder their commercial applications. To overcome these challenges, constructing heterostructures by integrating 2D materials as hosts and other materials as guests has emerged as a promising strategy to enhance the energy storage capability of PIBs. Despite significant progress in developing 2D-based heterostructures as electrode materials for PIBs, there is a lack of a review article that systematically summarizes the recent advances and comprehensively understands the relationship between heterostructure electrodes and their performance.