Li 2 CO 3 /LiF‐Rich Heterostructured Solid Electrolyte Interphase with Superior Lithiophilic and Li + ‐Transferred Characteristics via Adjusting Electrolyte Additives

Abstract The structure and components of solid electrolyte interphase (SEI) is crucial to direct the growth of lithium particles. However, it is hard to have control over them. Herein, an SEI that shares the properties of Li 2 CO 3 ‐rich and LiF‐rich types is realized by using different fluorine phenylphospines, and constructing a Li 2 CO 3 /LiF‐rich heterostructured SEI by using tris(4‐fluorophenyl)phosphine (TFPP) as the electrolyte additive. The well‐balanced SEI formed in TFPP‐containing electrolyte has the fast Li + transport kinetics of Li 2 CO 3 , good electron insulator capability of LiF, and strong affinity toward Li + . It can effectively guarantee fast, uniform Li + flux through the SEI while…

• NN
  National Natural Science Foundation of China

  Awards: 51971090, U21A20311