Dimensional engineering of anode materials for high performance potassium ion hybrid capacitor-A review

Potassium-ion hybrid capacitors (PIHCs) have received extensive attention due to the high-rate energy density and long-life cycling capability. However, PIHCs still suffer from structural instability and low power density. Outstanding dimensional engineering can solve the above problems to improve the performance of PIHC anode materials. Here, we systematically summarize the new strategies of preparing dimensionally-oriented materials for high performance PIHCs anode. To realize the influence of dimensions on high performance PIHC anode materials, we summarize the mechanisms in PIHC anode from one-dimension, two-dimension, and three-dimension, and analyze the problems encountered in improving the performance of PIHC anode materials of different dimensions. Then we make appropriate recommendations on the issues raised, and present future opportunities and challenges for PIHCs. This work can open up new perspectives for developing high performance PIHCs.

Automated summary

This study systematically summarizes the new strategies of preparing dimensionally-oriented materials for high performance PIHC anode, and analyzes the problems encountered in improving the performance of PIHC anode materials of different dimensions. Future opportunities and challenges for PIHCs are also presented.