School of Materials Science and Engineering;
Northeastern University;
Shenyang 110819;
China;
State Key Laboratory of Rolling and Automation;
Northeastern University;
Shenyang 110819;
China;
School of Resources and Materials;
Northeastern University at Qinhuangdao;
Qinhuangdao 066004;
China;
Hebei Key Laboratory of Dielectric and Electrolyte Functional Material;
Qinhuangdao 066004;
China;
Qinhuangdao Key Laboratory of Advanced Energy Storage and Conversion Technology;
Qinhuangdao 066004;
China;
Biocarbon; Potassium ion battery; Carbonization; Capacitance; Electrochemical performance;