A Safer Sodium-Ion Battery Based on Nonflammable Organic Phosphate Electrolyte

作者：Zeng, Ziqi; Jiang, Xiaoyu; Li, Ran; Yuan, Dingding; Ai, Xinping; Yang, Hanxi; Cao, Yuliang^*

来源：Advanced Science, 2016, 3(9): 1600066.

DOI：10.1002/advs.201600066

• IMPROVED ELECTROCHEMICAL PERFORMANCE
• SOLVENT-CONTAINING ELECTROLYTES
• TRANSITION-METAL OXIDE
• LONG-CYCLE-LIFE
• CATHODE MATERIAL
• HIGH-CAPACITY
• HARD-CARBON
• SOLID-ELECTROLYTE
• ANODE MATERIAL
• ALLOYING REACTIONS

Sodium-ion batteries are now considered as a low-cost alternative to lithium-ion technologies for large-scale energy storage applications; however, their safety is still a matter of great concern for practical applications. In this paper, a safer sodium-ion battery is proposed by introducing a nonflammable phosphate electrolyte (trimethyl phosphate, TMP) coupled with NaNi0.35Mn0.35Fe0.3O2 cathode and Sb-based alloy anode. The physical and electrochemical compatibilities of the TMP electrolyte are investigated by igniting, ionic conductivity, cyclic voltammetry, and charge-discharge measurements. The results exhibit that the TMP electrolyte with FEC additive is completely nonflammable and has wide electrochemical window (0-4.5 V vs. Na/Na+), in which both the Sb-based anode and NaNi0.35Mn0.35Fe0.3O2 cathode show high reversible capacity and cycling stability, similarly as in carbonate electrolyte. Based on these results, a nonflammable sodium-ion battery is constructed by use of Sb anode, NaNi0.35Mn0.35Fe0.3O2 cathode, and TMP + 10 vol% FEC electrolyte, which works very well with considerable capacity and cyclability, demonstrating a promising prospect to build safer sodium-ion batteries for large-scale energy storage applications.

• 出版日期2016-9
• 单位武汉大学; 哈尔滨学院