Altering Thermal Transformation Pathway to Create Closed Pores in Coal‐Derived Hard Carbon and Boosting of Na + Plateau Storage for High‐Performance Sodium‐Ion Battery and Sodium‐Ion Capacitor

Abstract Coal features low‐cost and high carbon yield and is considered as a promising precursor for carbon anode of sodium‐ion batteries (SIBs) and sodium‐ion capacitors (SICs). Regulation of microcrystalline state and pore configuration of coal structure during thermal transformation is key to boost Na + storage behavior. Herein, a facile strategy is reported to create abundant closed pores in anthracite‐derived carbon that greatly improves Na + plateau storage. An altered thermal transformation pathway of chemical activation followed by high‐temperature carbonization is adopted to achieve the conversion of open nanopores and ordered carbon crystallite into closed pores surrounded by short‐range carbon…

• NN
  National Natural Science Foundation of China

  Award: U21A20143
• FR
  Fundamental Research Funds for the Central Universities