Regulating Interphase Chemistry by Targeted Functionalization of Hard Carbon Anode in Ester‐Based Electrolytes for High‐Performance Sodium‐Ion Batteries

Abstract Commercial hard carbon (HC) anode suffers from unexpected interphase chemistry rooted in the parasitic reactions between surface oxygen‐functional groups and ester‐based electrolytes. Herein, an innovative strategy is proposed to regulate interphase chemistry by tailoring targeted functional groups on the HC surface, where highly active undesirable oxygen‐functional groups are skillfully converted into a Si−O−Si molecular layer favorable for anchoring anions. Then, an inorganic/organic hybrid solid electrolyte interphase with low interfacial charge transfer resistance and enhanced cycling durability is constructed successfully. Consequently, the modified HC anode delivers an excellent rate capability…

• NN
  National Natural Science Foundation of China

  Award: No. 52302234
• FR
  Fundamental Research Funds for the Central Universities

  Award: No. HIT.NSFJG202214