Polymorphism and Fast Potassium-Ion Conduction in the T5 Supertetrahedral Phosphidosilicate KSi₂ P₃.

ABSTRACT: The all-solid-state battery (ASSB) is a promising candidate for electrochemical energy storage. In view of the limited availability of lithium, however, alternative systems based on earth-abundant and inexpensive elements are urgently sought. Besides well-studied sodium compounds, potassium-based systems offer the advantage of low cost and a large electrochemical window, but are hardly explored. Here we report the synthesis and crystal structure of K-ion conducting T5 KSi₂ P₃ inspired by recent discoveries of fast ion conductors in alkaline phosphidosilicates. KSi₂ P₃ is composed of SiP₄ tetrahedra forming interpenetrating networks of large T5 supertetrahedra. The compound passes through a reconstructive phase transition from the known

SUBMITTER: Haffner A 

PROVIDER: S-EPMC8252096 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature