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Citation: MA Qiang, HU Yongsheng, LI Hong, CHEN Liquan, HUANG Xuejie, ZHOU Zhibin. An Sodium Bis (trifluoromethanesulfonyl) imide-based Polymer Electrolyte for Solid-State Sodium Batteries[J]. Acta Physico-Chimica Sinica, ;2018, 34(2): 213-218. doi: 10.3866/PKU.WHXB201707172 shu

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

MA Qiang ^1,2, ,
HU Yongsheng ¹ ,
LI Hong ¹ ,
CHEN Liquan ¹ ,
HUANG Xuejie ¹ ,
ZHOU Zhibin ²

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 Date: 6 June 2017
Revised Date: 9 July 2017

Fund Project: The project was supported by the National Key Technologies R&D Program,China (2016YFB0901504),the National Natural Science Foundation of China (51421002,51472268,51172083).

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|NaCu_1/9Ni_2/9Fe_1/3Mn_1/3O₂ cell.
- Sodium bis (trifluoromethanesulfonyl) imide,
- Solid polymer electrolyte,
- Poly (ethylene oxide),
- Sodium battery
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