Interface Modulation of Metal Sulfide Anodes for Long‐Cycle‐Life Sodium‐Ion Batteries

Abstract Although studies of transition metal sulfides (TMS) as anode materials for sodium‐ion batteries are extensively reported, the short cycle life is still a thorny problem that impedes their practical application. In this work, a new capacity fading mechanism of the TMS electrodes is demonstrated; that is, the parasitic reaction between electrolyte anions (i.e., ClO 4 − ) and metal sulfides yields non‐conductive and unstable solid‐electrolyte interphase (SEI) and meanwhile, corrosively turns metal sulfides into less‐active oxides. This knowledge guides the development of an electrochemical strategy to manipulate the anion decomposition and construct a stable interface that prevents extensive parasitic…

• NN
  National Natural Science Foundation of China

  Awards: 51972174, 52061135201, 22272080
• NS
  Natural Science Foundation of Jiangsu Province

  Award: BK20200076
• FR
  Fundamental Research Funds for the Central Universities

  Award: 30920041118