Repair Surface Defects on Biomass Derived Hard Carbon Anodes with N‐Doped Soft Carbon to Boost Performance for Sodium‐Ion Batteries

Abstract Biomass‐derived hard carbon (HC), a promising anode material for sodium‐ion batteries with low cost and good cycling ability, has high surface activity that easily reacts with the electrolyte, causing low initial coulombic efficiency (ICE) and poor stability. This article proposes a facile synthesis of pine wood‐derived HC material with N‐doped soft carbon (SC) coating strategy to improve electrochemical performance, especially for the ICE. The optimized anode material exhibits higher reversible capacity of 314.0 mAh g −1 at 30 mA·g −1 with greatly enhanced ICE of 85.2%, and high rate performance of 260.0 mAh g −1 at 5.0 C. Combined with in situ/ex situ characterizations, SC coating greatly increased…

• KT
  Key Technologies Research and Development Program

  Award: 2021YFA1501900