Article

Nonflammable Succinonitrile‐Based Deep Eutectic Electrolyte for Intrinsically Safe High‐Voltage Sodium‐Ion Batteries

Jian ChenInstitute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Zhejiang 325035 ChinaZhuo YangInstitute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Zhejiang 325035 ChinaXu XuInstitute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Zhejiang 325035 ChinaYun QiaoSchool of Environmental and Chemical Engineering Shanghai University Shanghai 200444 ChinaZhiming ZhouInstitute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Zhejiang 325035 ChinaZhiqiang HaoInstitute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Zhejiang 325035 ChinaXiaomin ChenInstitute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Zhejiang 325035 ChinaYang LiuInstitute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Zhejiang 325035 ChinaXingqiao WuInstitute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Zhejiang 325035 ChinaXunzhu ZhouInstitute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Zhejiang 325035 ChinaLin LiInstitute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Zhejiang 325035 ChinaShulei ChouInstitute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Zhejiang 325035 China

2024en

ABI

Abstract

Abstract Intrinsically 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.

Identifiers

DOI: 10.1002/adma.202400169

Citations and references

Cited by 20 references

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