ABSTRACT
Potassium-ion battery is promising for its high abundance and low redox potential. As a conversion cathode, Te possesses high conductivity and theoretical volumetric capacity to couple with potassium. The stubborn issues of K-Te battery focus on the large volume change and rapid structure degradation of Te. Herein, we produce biomass carbon from mangosteen shell in a facile method, and obtain a hierarchical porous host with abundance of micropores and mesopores, which is obviously beneficial for hosting Te during K+ storage in K-Te battery. The specific capacity reach to 560â mAh g-1 in the initial cycle at 0.1â A g-1 , and remained 83.8 % after 200â cycles. Impressively, at a high current density of 2.0â A g-1 , the specific capacity still remained 62.6 % after 5000â cycle. These results endow such strategy an efficient way for the development of K-Te batteries.