Methylamine Lithium Borohydride as Electrolyte for All-Solid-State Batteries.

ABSTRACT: Fast Li-ion conductivity at room temperature is a major challenge for utilization of all-solid-state Li batteries. Metal borohydrides with neutral ligands are a new emerging class of solid-state ionic conductors, and here we report the discovery of a new mono-methylamine lithium borohydride with very fast Li⁺ conductivity at room temperature. LiBH₄ ⋅CH₃ NH₂ crystallizes in the monoclinic space group P2₁ /c, forming a two-dimensional unique layered structure. The layers are separated by hydrophobic -CH₃ moieties, and contain large voids, allowing for fast Li-ionic conduction in the interlayers, σ(Li⁺ )=1.24×10^-3  S cm^-1 at room temperature. The electronic conductivity is negligible, and the electrochemical stability is ≈2.1 V vs Li. The first all-solid-state battery using a lithium borohydride with a neutral ligand as the electrolyte, Li-metal as the anode and TiS₂ as the cathode is demonstrated.

SUBMITTER: Grinderslev JB 

PROVIDER: S-EPMC9400857 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature