Zeng Ziqi, Jiang Xiaoyu, Li Ran, Yuan Dingding, Ai Xinping, Yang Hanxi, Cao Yuliang
College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 P.R. China.
School of Measurement and Control Technology and Communication Engineering Harbin University of Science and Technology Harbin 150080 P.R. China.
Adv Sci (Weinh). 2016 Apr 23;3(9):1600066. doi: 10.1002/advs.201600066. eCollection 2016 Sep.
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 NaNiMnFeO 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 NaNiMnFeO 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, NaNiMnFeO 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.
钠离子电池现在被认为是用于大规模储能应用的锂离子技术的低成本替代品；然而，其安全性对于实际应用而言仍然是一个备受关注的问题。在本文中，通过引入一种不可燃的磷酸盐电解质（磷酸三甲酯，TMP），并结合NaNiMnFeO阴极和Sb基合金阳极，提出了一种更安全的钠离子电池。通过点火、离子电导率、循环伏安法和充放电测量来研究TMP电解质的物理和电化学兼容性。结果表明，添加FEC的TMP电解质完全不可燃，并且具有较宽的电化学窗口（相对于Na/Na为0 - 4.5 V），其中Sb基阳极和NaNiMnFeO阴极均表现出高可逆容量和循环稳定性，与碳酸盐电解质中的情况类似。基于这些结果，利用Sb阳极、NaNiMnFeO阴极和TMP + 10体积% FEC电解质构建了一种不可燃的钠离子电池，该电池在具有相当容量和可循环性的情况下运行良好，展示了为大规模储能应用构建更安全的钠离子电池的广阔前景。
