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KB3H8·NH3B3H7Complex as a Potential Solid-State Electrolyte with Excellent Stability against K Metal
- Source :
- ACS Applied Materials & Interfaces; April 2022, Vol. 14 Issue: 15 p17378-17387, 10p
- Publication Year :
- 2022
-
Abstract
- All-solid-state potassium batteries are promising candidates in the fields of large-scale energy storage owing to their intrinsic safety, stability, and cost-effectiveness. However, a suitable solid-state electrolyte with high ionic conductivity and favorable interfacial stability is a major challenge for the design and development of these batteries. Herein, we report the synthesis of new KB3H8·nNH3B3H7(n= 0.5 and 1) complexes to develop suitable solid-state K-ion conductors for batteries. Both the complexes undergo a reversible phase transition below the thermal decomposition temperature. The optimal KB3H8·NH3B3H7delivers a solid-state K-ion conductivity of 1.3 × 10–4S cm–1at 55 °C with an activation energy of 0.44 eV after a transition from a monoclinic to an orthorhombic phase, which is the highest value of K borohydrides reported to date and places KB3H8·NH3B3H7among the leading solid-state K-ion conductors. Moreover, KB3H8·NH3B3H7reveals a K-ion transference number of nearly 0.93, an electrochemical stability window of 1.2 to 3.5 V vs K+/K, a good capability of K dendrite suppression, and a remarkable stability against the K metal anode due to the formation of the stable interface. These performances make KB3H8·NH3B3H7a promising electrolyte for all-solid-state potassium batteries.
Details
- Language :
- English
- ISSN :
- 19448244
- Volume :
- 14
- Issue :
- 15
- Database :
- Supplemental Index
- Journal :
- ACS Applied Materials & Interfaces
- Publication Type :
- Periodical
- Accession number :
- ejs59372869
- Full Text :
- https://doi.org/10.1021/acsami.2c01586