储能科学与技术 ›› 2022, Vol. 11 ›› Issue (4): 1103-1109.doi: 10.19799/j.cnki.2095-4239.2021.0694

• 国际优秀储能青年科学家专刊 • 上一篇    下一篇

基于双盐高浓度电解液的高稳定性钠金属负极

陶影1(), 赵铃飞1, 王云晓1(), 曹余良2(), 侴术雷3()   

  1. 1.卧龙岗大学超导和电子材料研究院，澳大利亚创新材料研究所，澳大利亚 新南威尔士州 伍伦贡 2522
    2.武汉大学化学与分子科学学院，湖北 武汉 430072
    3.温州大学化学与材料工程学院，浙江 温州 325035
  • 收稿日期:2021-12-21 修回日期:2022-01-02 出版日期:2022-04-05 发布日期:2022-04-11
  • 通讯作者: 王云晓,曹余良,侴术雷 E-mail:yt574@uowmail.edu.au;yunxiao@uow.edu.au;ylcao@whu.edu.cn;chou@wzu.edu.cn
  • 作者简介:陶影（1989—），女，博士研究生，研究方向为钠金属负极及钠硫电池，E-mail：yt574@uowmail.edu.au；
  • 基金资助:
    Superior room-temperature sodium-sulfur batteries(DE170100928)

Stabilization of sodium metal anodes by dual-salt high concentration electrolyte

Ying TAO1(), Lingfei ZHAO1, Yunxiao WANG1(), Yuliang CAO2(), Shulei CHOU3()   

  1. 1.Institute for Superconducting & Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong 2522, New South Wales, Australia
    2.College of Chemistry and Molecular Sciences, Hubei Key Laboratory of Electrochemical Power Sources, Wuhan University, Wuhan 430072, Hubei, China
    3.Institute for Carbon Neutralization, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, Zhejiang, China
  • Received:2021-12-21 Revised:2022-01-02 Online:2022-04-05 Published:2022-04-11
  • Contact: Yunxiao WANG,Yuliang CAO,Shulei CHOU E-mail:yt574@uowmail.edu.au;yunxiao@uow.edu.au;ylcao@whu.edu.cn;chou@wzu.edu.cn

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摘要：

钠金属被认为是下一代高能量密度、高功率密度储能器件中非常有前景的负极材料。然而钠金属一直面临着循环性差以及钠金属枝晶生长造成的安全隐患的困扰。为了提高钠金属负极的循环稳定性，我们研究了钠金属负极在双(氟磺酰)亚胺钠和双(三氟甲基磺酰)亚胺钠高浓度电解液中的性能。研究发现，通过将NaFSI和NaTFSI混合得到双盐高浓度电解液，钠金属负极可以实现相对于单一盐电解液显著提高的循环性能。电化学性能和循环后的形貌表征表明，高浓度双盐电解液可以防止电解液腐蚀集流体，而且还能在钠金属负极表面构建更稳定的界面层。本工作还使用这种双盐高浓度电解液组装了钠金属全电池并实现了稳定的循环性能，表明这种新型的电解液有非常好的实用化前景。

关键词: 双盐, 高浓度, 电解液, 钠金属, 负极

Abstract:

Sodium (Na) metal has been regarded as a promising anode candidate for next-generation batteries with high energy density and power density. The Na metal anode, however, suffers from poor cycling stability and safety hazards associated with Na dendrite growth. To enhance cycling stability, sodium bis(fluorosulfonyl)imide (NaFSI) and sodium trifluoromethanesulfonimide (NaTFSI) were tested as a mixed dual salt in a series of high-concentration electrolytes, with diglyme (G2) as solvent. A NaFSI-NaTFSI high-concentration electrolyte considerably enhanced the cycling stability of Na metal anodes compared with single-salt electrolytes. Electrochemical performance and morphologies of the cycled Na metal anode indicate that the high-concentration dual-salt electrolyte could inhibit corrosion of the current collector and generate stable interfaces on the anodes. Na metal full cells coupled with a Na3V2(PO4)2F3 (NVPF) cathode in the optimal dual-salt high-concentration electrolyte have also been realized with stable cycling. This demonstrates the feasibility of this approach for practical applications in sodium metal batteries.

Key words: dual salt, high-concentration, electrolyte, Na metal anode, sodium metal batteries

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