Guo Yu, Li Jiahui, Wang Hairui, Chang Limin, Rui Binglong, Lin Li, Xu Tianhao, Nie Ping
Key Laboratory of Preparation and Applications of Environmental Friendly Material of the Ministry of Education, College of Chemistry, Jilin Normal University, Changchun, China.
School of Materials Science and Energy Engineering, Foshan University, Foshan, China.
Front Chem. 2020 Sep 8;8:784. doi: 10.3389/fchem.2020.00784. eCollection 2020.
Cost effective anode material with rational design is of significance for rechargeable potassium ion batteries (KIBs). Graphite anode currently still suffers unfavorable rate capability and moderate cycling stability. In this work, we report a mesoporous carbon sphere with rich porous structure as an anode material for KIBs with the assistance of an aerosol spray technology. The as-developed carbon spheres exhibit a well-defined spherical structure with favorable surface area of 1106.32 m g. Furthermore, the effect of different electrolytes on the electrochemical performance of the carbon anode has been investigated systematically. As expected, the carbon material shows excellent potassium storage performance in terms of improved specific capacity of 188.2 mAh g, rate capability and prolonged cyclability with a high capacity of 105.3 mAh g after 500 cycles at a rate of 100 mA g toward potassium storage in KFSI based carbonate electrolyte.
具有合理设计的高性价比阳极材料对于可充电钾离子电池（KIBs）具有重要意义。目前，石墨阳极的倍率性能仍不理想，循环稳定性一般。在这项工作中，我们借助气溶胶喷雾技术，报道了一种具有丰富多孔结构的介孔碳球作为KIBs的阳极材料。所制备的碳球呈现出明确的球形结构，比表面积为1106.32 m²/g。此外，还系统研究了不同电解质对碳阳极电化学性能的影响。正如预期的那样，在基于KFSI的碳酸盐电解质中，该碳材料在钾存储方面表现出优异的性能，比容量提高到188.2 mAh/g，倍率性能良好，循环稳定性增强，在100 mA/g的电流密度下循环500次后，仍具有105.3 mAh/g的高容量。
