储能科学与技术 ›› 2020, Vol. 9 ›› Issue (5): 1234-1250.doi: 10.19799/j.cnki.2095-4239.2020.0192

• 钠离子电池技术专刊 • 上一篇    下一篇

非水系钠离子电池的电解质研究进展

马梦莹1(), 潘慧霖1(), 胡勇胜2,3   

  1. 1.浙江大学,浙江 杭州 310027
    2.中国科学院物理研究所,北京 100191
    3.中科海钠科技有限责任公司,北京 100194
  • 收稿日期:2020-05-29 修回日期:2020-07-15 出版日期:2020-09-05 发布日期:2020-09-08
  • 通讯作者: 潘慧霖 E-mail:21937034@zju.edu.cn;panhuilin@zju.edu.cn
  • 作者简介:马梦莹(1996—),女,硕士研究生,研究方向为钠离子电池电解质,E-mail:21937034@zju.edu.cn
  • 基金资助:
    浙江大学百人计划,浙江大学能源清洁利用国家重点实验室自主课题(ZJUCE2020005)

Progress in electrolyte research for non-aqueous sodium ion batteries

Mengying MA1(), Huilin PAN1(), Yongsheng HU2,3   

  1. 1.Zhejiang University, Hangzhou 310027, Zhejiang, China
    2.Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
    3.HiNa Battery Technology Co. Ltd. , Beijing 100194, China
  • Received:2020-05-29 Revised:2020-07-15 Online:2020-09-05 Published:2020-09-08
  • Contact: Huilin PAN E-mail:21937034@zju.edu.cn;panhuilin@zju.edu.cn

摘要:

钠离子电池具有钠资源丰富、成本低等优势,是一种很有前景的储能电池体系。目前,国内外研究者们已开发出多种可行的钠离子电池正负极材料。钠离子电池电解质作为正负极材料参与氧化还原反应的媒介,其氧化还原窗口、钠离子的迁移和扩散、钠离子的溶剂化结构、钠离子与阴离子或溶剂之间的耦合关联作用等性质,是决定电极材料界面性质的关键因素。因而,钠离子电池电解质对钠离子电池体系的热力学和动力学性质具有重要的影响,如电极材料的结构稳定性、固态电解质膜(SEI)的组成和结构、电池的倍率性能、循环稳定性和热稳定性等。本文总结了有关非水系钠离子电池电解质的研究进展,包括液体电解液和固态电解质等,讨论了不同类型电解质的物理化学性质及其在钠离子电池中的应用。当前,钠离子电池液态和固态电解质仍存在电导率低、电化学窗口窄、SEI膜稳定性较差等问题。开发新型、低成本、高性能的钠离子电池电解质对钠离子电池的商业化应用至关重要。

关键词: 非水系钠离子电池, 液态电解质, 固态电解质, 电化学性能

Abstract:

Sodium ion batteries are promising for large scale energy storage due to high abundance and low cost of sodium resources. So far, researchers have proposed several possible cathode and anode materials for sodium ion batteries. Electrolytes, serving as the media for redox reactions on cathode and anode, largely determine the electrode-electrolyte interfaces through the redox window, Na+ diffusion and migration, solvation structure of Na ions, and the coupled Na cation-anion-solvent (or solid framework) correlations etc. The electrolyte and interface play important roles in the thermodynamic and kinetics situations in sodium ion batteries, such as the electrode material stability, SEI formation, battery rate performance, thermal stability and cycling performance. In this work, we reviewed recent progresses in non-aqueous liquid and solid electrolytes for sodium ion batteries. The physicochemical properties of electrolytes and their remaining issues such as low ionic conductivity, narrow electrochemical window and poor stability of SEI layers are carefully discussed. The commercialization of sodium ion battery technology still requires development of functional and low-cost sodium ion battery electrolyte and comprehensive understanding the electrode-electrolyte interface properties.

Key words: non-aqueous sodium ion batteries, liquid electrolyte, solid electrolyte, electrochemical performance

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