A Safer Sodium-Ion Battery Based on Nonflammable Organic Phosphate Electrolyte.
A Safer Sodium-Ion Battery Based on Nonflammable Organic Phosphate Electrolyte.
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基于不可燃有机磷酸盐电解质的更安全钠离子电池
DOI：
10.1002/advs.201600066
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发表时间：
2016-09
期刊：
影响因子：
15.1
通讯作者：
Cao, Yuliang
中科院分区：
文献类型：
--
作者：
Zeng, Ziqi;Jiang, Xiaoyu;Li, Ran;Yuan, Dingding;Ai, Xinping;Yang, Hanxi;Cao, Yuliang
钠离子电池现在被认为是大规模储能应用中锂离子技术的低成本替代品；然而，它们的安全性仍然是实际应用中备受关注的问题。在本文中，通过引入不可燃的磷酸盐电解质（磷酸三甲酯，TMP）与NaNi0.35Mn0.35Fe0.3O2正极和Sb基合金负极相结合，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研究了 TMP 电解质的物理和电化学兼容性。结果表明，含有 FEC 添加剂的 TMP 电解质完全不可燃，并且具有较宽的电化学窗口（0-4.5 V vs. Na/Na+），其中 Sb 基阳极和 NaNi0.35Mn0.35Fe0.3O2 阴极均表现出高可逆容量和循环稳定性，与碳酸盐电解质类似。基于这些结果，使用Sb阳极、NaNi0.35Mn0.35Fe0.3O2阴极和TMP + 10 vol% FEC电解质构建了不可燃钠离子电池，该电池具有良好的容量和可循环性，展示了为大规模储能应用构建更安全的钠离子电池的良好前景。
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.
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