Affiliation:
1. School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 China
2. Institute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Zhejiang 325035 China
3. Wenzhou Key Laboratory of Sodium‐Ion Batteries Wenzhou University Technology Innovation Institute for Carbon Neutralization Zhejiang 325035 China
Abstract
AbstractIntrinsically safe sodium‐ion batteries are considered as a promising candidate for large‐scale energy storage systems. However, the high flammability of conventional electrolytes may pose serious safety threats and even explosions. Herein, a strategy of constructing a deep eutectic electrolyte is proposed to boost the safety and electrochemical performance of succinonitrile (SN)‐based electrolyte. The strong hydrogen bond between S═O of 1,3,2‐dioxathiolane‐2,2‐dioxide (DTD) and the α‐H of SN endows the enhanced safety and compatibility of SN with Lewis bases. Meanwhile, the DTD participates in the inner Na+ sheath and weakens the coordination number of SN. The unique solvation configuration promotes the formation of robust gradient inorganic‐rich electrode–electrolyte interphase, and merits stable cycling of half‐cells in a wide temperature range, with a capacity retention of 82.8% after 800 cycles (25 °C) and 86.3% after 100 cycles (60 °C). Correspondingly, the full cells deliver tremendous improvement in cycling stability and rate performance.
Funder
National Natural Science Foundation of China
High-end Foreign Experts Recruitment Plan of China
Science and Technology Plan Project of Wenzhou Municipality
Key Research and Development Program of Zhejiang Province
Basic Research Project of Wenzhou City
Cited by
7 articles.
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