Affiliation:
1. School of Materials and Chemistry University of Shanghai for Science and Technology Shanghai 200093 China
2. Department of Materials Science and Engineering National University of Singapore Singapore 117574 Singapore
3. National University of Singapore (Chongqing) Research Institute Chongqing 401120 China
4. Institute of Materials Research and Engineering Agency for Science, Technology and Research Singapore 138634 Singapore
Abstract
AbstractAll‐solid‐state Na‐ion batteries are considered to be one of the most promising candidates for large‐scale applications at low‐cost. Hydride electrolytes have been pursued as a research hotspot more recently, owing to their high Na‐ion conductivities, while there is an urgent need to address their electrochemical stabilities in order to meet the requirements for applications in Na batteries. Herein, a novel and universal strategy is proposed to improve the electrochemical stabilities of hydride electrolytes, which takes advantage of the in situ reactions between hydrides and NaHF2. As a representative example, Na2B12H12 can react with NaHF2 to form NaF nanoparticles that are uniformly embedded in the Na2B12H11F matrix, which exhibits superior electrode compatibilities without apparent reduction in conductivity. The symmetrical Na cell thus derived shows a long‐term cycling and the quasi‐symmetrical Na3V2(PO4)3 cell shows high Coulombic efficiency. They give rise to a stable cycling of the Na||Na3V2(PO4)3 all‐solid‐state batteries with a capacity retention of 87.7% after 100 cycles, which can be attributed to the stabilization of electrolyte/electrode interfaces by the F‐enriched interphases. Beyond Na batteries, the present study sheds timely new light on the development of hydride electrolytes for other long‐waited applications.
Funder
National Natural Science Foundation of China
Science and Technology Commission of Shanghai Municipality
Shanghai Rising-Star Program
Shanghai Municipal Education Commission
Advanced Research and Technology Innovation Centre, College of Design and Engineering, National University of Singapore
Subject
General Materials Science,Renewable Energy, Sustainability and the Environment