Department of Mechanical Engineering;
National University of Singapore;
Singapore 117575;
Singapore;
School of Science;
Harbin Institute of Technology;
Shenzhen 518055;
Guangdong;
China;
National University of Singapore Chongqing Research Institute;
Chongqing 401123;
China;
Graduate School for Integrative Sciences and Engineering;
National University of Singapore;
Singapore 138632;
Singapore;
Singapore Institute of Manufacturing Technology;
A*STAR(Agency for Science;
Technology;
and Research);
Singapore 138634;
Singapore;
Department of Materials Science and Engineering;
National University of Singapore;
Singapore 117575;
Singapore;
Monash Suzhou Research Institute;
Suzhou 215123;
Jiangsu;
China;
Biomass; Nitrogen doping; Hard carbon; Sodium-ion batteries;