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- Title
Prussian Blue‐Type Sodium‐ion Conducting Solid Electrolytes for All Solid‐State Batteries.
- Authors
Kim, Taewon; Hyeok Ahn, Sang; Song, You‐Yeob; Jin Park, Beom; Lee, Chanhee; Choi, Ahreum; Kim, Min‐Ho; Seo, Dong‐Hwa; Jung, Sung‐Kyun; Lee, Hyun‐Wook
- Abstract
Conventional solid electrolyte frameworks typically consist of anions such as sulphur, oxygen, chlorine, and others, leading to inherent limitations in their properties. Despite the emergence of sulphide, oxide, and halide‐based solid electrolytes for all‐solid‐state batteries, their utilization is hampered by issues, including the evolution of H2S gas, the need for expensive elements, and poor contact. Here, we first introduce Prussian Blue analogue (PBA) open‐framework structures as a solid electrolyte that demonstrates appreciable Na+ conductivity (>10−2mS cm−1). We delve into the relationship between Na+ conductivity and the lattice parameter of N‐coordinated transition metal, which is attributed to the reduced interaction between Na+ and the framework, corroborated by the distribution of relaxation times and density functional theory calculations. Among the five PBAs studied, Mn‐PBA have exhibited the highest Na+ conductivity of 9.1×10−2mS cm−1. Feasibility tests have revealed that Mn‐PBA have maintained a cycle retention of 95.1 % after 80cycles at 30 °C and a C‐rate of 0.2C. Our investigation into the underlying mechanisms that play a significant role in governing the conductivity and kinetics of these materials contributes valuable insights for the development of alternative strategies to realize all‐solid‐state batteries.
- Subjects
SOLID electrolytes; SODIUM ions; PRUSSIAN blue; DENSITY functional theory; LATTICE constants; TRANSITION metal oxides; CHLORINE
- Publication
Angewandte Chemie, 2023, Vol 135, Issue 42, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202309852