The problems with solid-state sodium ion battery electrolytes and their solutions

¹ School of Materials and Chemical Engineering, Hunan Institute of Engineering, Xiangtan, Hunan, 411104, China
² SDU-ANU Joint Science College, Shandong University (Weihai), Weihai, Shandong, 264200, China
³ College of Chemistry & Chemical Engineering, Shantou University, Shantou, Guangdong, 515041, China

^* Corresponding author: 21ymli@stu.edu.cn

Abstract

In the context of the continuous growth of global demand for energy storage, electrochemical energy storage systems stand out among many energy storage technologies due to their excellent performance. At present, batteries as one of the most mainstream forms of electrochemical energy storage, such as fuel cells, lithium-ion batteries, and solid-state batteries, have been widely used. In particular, as the safety hazards existing in lithium-ion batteries due to the inclusion of organic electrolytes have gradually been recognized, solid-state batteries have received extensive attention and in-depth research for their higher safety performance. As an emerging electrochemical energy storage device, the most prominent feature of solid sodium-ion batteries is that they use solid electrolytes instead of traditional liquid electrolytes, which greatly improves the safety of batteries theoretically. Unfortunately, while solid electrolytes exhibit excellent chemical stability and good electrochemical performance, they still face a number of challenges in practical applications, including low ionic conductivity, poor interface contact, and short life span. In this paper, the characteristics, challenges, and solutions of electrolytes in solid-state sodium-ion batteries are discussed.