A Stress‐Buffering Hierarchically Porous Silicon/Carbon Composite for High‐Energy Lithium‐Ion Batteries

Abstract The electrochemical performance of Si anodes for lithium‐ion batteries (LIBs) is primarily influenced by the stress–strain and transport dynamics. However, traditional Si/carbon composites often fail to well balance these two factors. Herein, a hierarchically porous silicon/carbon composite (denoted as pSi@void@NMC) with high lithium storage capacity is developed under the guidance of finite element analysis, where porous Si (pSi) and nitrogen‐doped mesoporous carbon (NMC) is used as the yolk and shell, respectively. The internal and external cultivation design endows the pSi@void@NMC composite with fast transfer kinetics, effective stress‐buffering, low volume expansion, and superior mechanical…

• NS
  Natural Science Foundation of Shanghai

  Award: 23ZR1423800