物理化学学报 >> 2018, Vol. 34 >> Issue (2): 213-218.doi: 10.3866/PKU.WHXB201707172

所属专题： 高被引科学家专刊

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双(三氟甲基磺酰)亚胺钠基聚合物电解质在固态钠电池中的性能

马强1,2,胡勇胜1,*(),李泓1,陈立泉1,黄学杰1,周志彬2,*()   

  1. 1 中国科学院物理研究所,北京100190
    2 华中科技大学化学与化工学院,武汉430074
  • 收稿日期:2017-06-06 发布日期:2017-11-13
  • 通讯作者: 胡勇胜,周志彬 E-mail:yshu@iphy.ac.cn;zb-zhou@mail.hust.edu.cn
  • 基金资助:
    国家重点研发计划(2016YFB0901504);国家自然科学基金(51421002);国家自然科学基金(51472268);国家自然科学基金(51172083)

An Sodium Bis (trifluoromethanesulfonyl) imide-based Polymer Electrolyte for Solid-State Sodium Batteries

Qiang MA1,2,Yongsheng HU1,*(),Hong LI1,Liquan CHEN1,Xuejie HUANG1,Zhibin ZHOU2,*()   

  1. 1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China
    2 School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
  • Received:2017-06-06 Published:2017-11-13
  • Contact: Yongsheng HU,Zhibin ZHOU E-mail:yshu@iphy.ac.cn;zb-zhou@mail.hust.edu.cn
  • Supported by:
    the National Key Technologies R & D Program, China(2016YFB0901504);the National Natural Science Foundation of China(51421002);the National Natural Science Foundation of China(51472268);the National Natural Science Foundation of China(51172083)

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摘要：

采用简单的溶液浇铸法制备出由双（三氟甲基磺酰）亚胺钠（NaTFSI）/聚氧乙烯（PEO）构筑的固态聚合物电解质（SPE），并针对其相转变、结晶性、热稳定性、电导率以及电化学稳定性等基础理化及电化学性质进行了系统表征。结果表明，NaTFSI/PEO（[EO]/[Na+]=15）SPE具有相对高的电导率（σ ≈ 10-3 S·cm-1，80℃）、高的耐氧化能力（4.86 V vs Na+/Na）和热稳定性高达350℃。电池测试结果表明，该NaTFSI基SPE不仅对金属钠电极能够呈现出优异的界面稳定性，而且在Na|SPE|NaCu1/9Ni2/9Fe1/3Mn1/3O2电池中展现出良好的循环和倍率性能。

关键词: 双(三氟甲基磺酰)亚胺钠, 固态聚合物电解质, 聚氧乙烯, 钠电池

Abstract:

A solid polymer electrolyte (SPE), composed of sodium bis(trifluoromethanesulfonyl)imide (NaTFSI) and poly(ethylene oxide) (PEO), is prepared by a simple solution-casting method. The physicochemical and electrochemical properties of the NaTFSI/PEO ([EO]/[Na+]=15) SPE in terms of its phase transitions, crystallization, thermal stability, ionic conductivity, and anodic electrochemical stability are systematically investigated. We demonstrate that the NaTFSI/PEO SPE has a relatively high ionic conductivity (σ ≈ 10-3 S·cm-1) at 80℃, excellent electrochemical stability (4.86 V vs. Na+/Na), and thermal stability up to 350℃. More importantly, the NaTFSI-based SPE delivers not only excellent chemical and electrochemical stability with sodium metal, but also good cycling and rate performances in an Na|SPE|NaCu1/9Ni2/9Fe1/3Mn1/3O2 cell.

Key words: Sodium bis (trifluoromethanesulfonyl) imide, Solid polymer electrolyte, Poly (ethylene oxide), Sodium battery