fig8

Figure 8. Mechanistic understanding of LHCEs. (A) Radial distribution of solvents, anions and different diluents. Adapted with permission^[125] [copyright 2021, the author(s)]. (B) Percentage of Li⁺ coordinated with different numbers of FSI^- in dilute electrolytes (D1 and D4), HCE (D7) and LHCE (T3) based on molecular dynamics simulations. Reproduced with permission^[99] (copyright 2020, WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim). (C) Schematic of anion-cation coordination for anion-derived SEI via regulation of the electric double layer. Reproduced with permission^[128] (copyright 2020, WILEY‐VCH GmbH). (D) Solvent diagram dependent on dielectric constant and relative binding energy (compared to DME). The solvents in the cyan region can enhance the coordination between Li⁺ and anions, which facilitates the generation of the anion-derived SEI. Reproduced with permission^[126] (copyright 2021, WILEY‐VCH GmbH). SEI: Solid electrolyte interphase; LHCE: localized highly concentrated electrolyte; HCE: highly concentrated electrolyte; FSI^-: bis(fluorosulfonyl)imide.