无机材料学报 ›› 2021, Vol. 36 ›› Issue (3): 332-336.DOI: 10.15541/jim20200206 CSTR: 32189.14.10.15541/jim20200206

所属专题: 能源材料论文精选(2021) 【能源环境】金属有机框架材料(202309)

• 研究快报 • 上一篇    

固态锂电池用MOF/聚氧化乙烯复合聚合物电解质

梁凤青1,2(), 温兆银1,2()   

  1. 1. 中国科学院 上海硅酸盐研究所, 中国科学院能量转换材料重点实验室, 上海 200050
    2. 中国科学院大学 材料科学与光电工程中心, 北京 100049
  • 收稿日期:2020-04-20 修回日期:2020-05-05 出版日期:2021-03-20 网络出版日期:2020-05-20
  • 通讯作者: 温兆银, 研究员. E-mail: zywen@mail.sic.ac.cn
  • 作者简介:梁凤青(1994-), 女, 硕士研究生. E-mail: liangfengqing@student.sic.ac.cn

MOF/Poly(Ethylene Oxide) Composite Polymer Electrolyte for Solid-state Lithium Battery

LIANG Fengqing1,2(), WEN Zhaoyin1,2()   

  1. 1. CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
    2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-04-20 Revised:2020-05-05 Published:2021-03-20 Online:2020-05-20
  • Contact: WEN Zhaoyin, professor. E-mail: zywen@mail.sic.ac.cn
  • About author:LIANG Fengqing(1994-), female, Master candidate. E-mail: liangfengqing@student.sic.ac.cn
  • Supported by:
    National Key R&D Program of China(2018YFB0905400);National Natural Science Foundation of China(51772315);Science and Technology Commission of Shanghai Municipality(18DZ2280800)

摘要:

固态聚合物电解质具有柔韧性好和易于加工的优势, 可制备各种形状的固态锂电池, 杜绝漏液问题。但固态聚合物电解质存在离子电导率低以及对锂金属负极不稳定等问题。本研究以纳米金属-有机框架材料UiO-66为聚合物电解质的填料, 用于改善电解质的性能。UiO-66与聚氧化乙烯(poly(ethylene oxide), PEO)链上醚基的氧原子的配位作用以及与锂盐中阴离子的相互作用, 可显著提高聚合物电解质的离子电导率(25 ℃, 3.0×10 -5S/cm; 60 ℃, 5.8×10 -4 S/cm), 并将锂离子迁移数提高至0.36, 电化学窗口拓宽至4.9 V。此外, 制备的PEO基固态电解质对金属锂具有良好的稳定性, 对称电池在60 ℃、0.15 mA·cm -2电流密度下可稳定循环1000 h, 锂电池的电化学性能得到显著改善。

关键词: 复合电解质, 聚氧化乙烯, 金属-有机框架材料, 锂金属电池

Abstract:

Solid polymer electrolytes (SPEs) with high flexibility and processability enable the fabrication of leak-free solid-state batteries with varied geometries. However, SPEs usually suffer from low ionic conductivity and poor stability with lithium metal anodes. Here, we propose nano-sized metal-organic framework (MOF) material(UiO-66) as filler for poly(ethylene oxide) (PEO) polymer electrolyte. The coordination of UiO-66 with oxygen in PEO chain and the interaction between UiO-66 and lithium salt significantly improve the ionic conductivity (3.0×10 -5 S/cm at 25 ℃, 5.8×10 -4 S/cm at 60 ℃) and transference number of Li + (0.36), widen the electrochemical window to 4.9 V (vs Li +/Li), enhance the stability with lithium metal anode. As a result, the as-prepared Li symmetrical cells can continuously operate for 1000 h at 0.15 mA?cm -2, 60 ℃. The results show that UiO-66 filler is effective to improve the electrochemical performance of polymer electrolyte.

Key words: composite electrolyte, poly(ethylene oxide), metal-organic framework material, lithium metal battery

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