Safety of electrolytes for sodium-ion batteries: Strategies and progress

doi:10.19799/j.cnki.2095-4239.2020.0230

Abstract

Abstract:

Sodium-ion batteries (SIBs) have been widely concerned by researchers because of their resource advantages and potential application in large-scale energy storage systems. The electrolyte is one of the core components of batteries, which plays roles of conducting ions and separating the cathode and anode electrodes. At present, the most commonly used organic liquid electrolyte has the shortcomings of flammability and easy to leakage, which brings great safety risks to the batteries and hinders the further development and application of SIBs. In this paper, the development strategies and research progress of improving electrolyte safety of SIBs are reviewed by summarizing the currently relevant reports. On the one hand, improvements and optimizations can be made on the basis of organic liquid electrolytes, such as the use of film-forming additives, flame retardant additives, or the use of high-concentration salt electrolytes; on the other hand, new electrolyte systems can be developed, such as aqueous electrolytes, ionic liquid electrolytes, all-solid-state electrolytes, and gel electrolytes etc. Advanced electrolytes are currently a research hotspot in the field of SIBs, in this article, the advantages and disadvantages of several advanced electrolytes and main challenges they faced have been analyzed and discussed. The application prospect of gel electrolytes in SIBs have been eminently introduced. Finally, the development trend of electrolytes for sodium ion batteries is prospected.

Key words: sodium-ion batteries, electrolytes, solid-state electrolytes, gel electrolytes, safety

CLC Number:

TM 911

Yongsheng GAO, Guanghai CHEN, Xinran WANG, Ying BAI, Chuan WU. Safety of electrolytes for sodium-ion batteries: Strategies and progress[J]. Energy Storage Science and Technology, 2020, 9(5): 1309-1317.

Figures/Tables 2

References 61

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