储能科学与技术 ›› 2021, Vol. 10 ›› Issue (3): 914-924.doi: 10.19799/j.cnki.2095-4239.2021.0070

• 固态离子学与储能专刊 • 上一篇    下一篇

液体电解液改性石榴石型固体电解质与锂负极的界面

池上森1(), 姜益栋1, 王庆荣1, 叶子威1, 余凯1, 马骏1, 靳俊3, 王军1, 王朝阳2, 温兆银3, 邓永红1()   

  1. 1.南方科技大学材料科学与工程系，广东 深圳 518055
    2.华南理工大学材料科学研究所，广东 广州 510640
    3.中国科学院上海硅酸盐研究所，上海 200050
  • 收稿日期:2021-02-28 修回日期:2021-03-18 出版日期:2021-05-05 发布日期:2021-04-30
  • 通讯作者: 邓永红 E-mail:chiss@sustech.edu.cn;yhdeng08@163.com
  • 作者简介:池上森(1983—)，男，博士，研究助理教授，主要研究方向为锂负极、固态电解质和固态锂电池，E-mail：chiss@sustech.edu.cn
  • 基金资助:
    国家重点研发计划“新能源汽车”重点专项，高比能固态锂电池技术(2018YFB0104300);广东省重点领域研发计划项目，固态动力电池系统研发及产业化(2020B090919001)

The liquid electrolyte modified interface between garnet-type solid-state electrolyte and lithium anode

Shangsen CHI1(), Yidong JIANG1, Qingrong WANG1, Ziwei YE1, Kai YU1, Jun MA1, Jun JIN3, Jun WANG1, Chaoyang WANG2, Zhaoyin WEN3, Yonghong DENG1()   

  1. 1.Deapartment of Materials and Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China
    2.Research Institute of Materials Science, South China University of Technology, Guangzhou 510640, Guangdong, China
    3.Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, China
  • Received:2021-02-28 Revised:2021-03-18 Online:2021-05-05 Published:2021-04-30
  • Contact: Yonghong DENG E-mail:chiss@sustech.edu.cn;yhdeng08@163.com

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摘要：

石榴石固体电解质型的固态锂金属电池因具有高能量密度、高安全性和长循环寿命等优点而受到了研究人员的重点关注，然而石榴石型电解质和锂负极之间存在巨大的界面阻抗，严重阻碍了电池的正常工作。针对该问题，本文主要在石榴石型固体电解质与锂负极之间的界面引入少量的电解液，减少石榴石型电解质与锂负极的界面阻抗，使得固态对称锂电池正常循环。进一步地采用扫描电子显微镜(SEM)、X射线能谱仪(EDS)、X射线光电子能谱(XPS)和电化学阻抗谱(EIS)研究了石榴石型电解质与锂负极之间界面层的形貌、成分、界面阻抗和循环稳定性。研究结果表明，液体电解液极大地降低了石榴型电解质与锂负极间的界面阻抗，在80 ℃情况下，石榴型电解质与锂负极循环前的面电阻为1.89 Ω·cm2，循环后的面电阻为3.24 Ω·cm2。

关键词: 石榴石型固体电解质, 锂负极, 界面, 电解液, 界面电阻

Abstract:

Garnet-type electrolyte-based solid-state lithium metal batteries have attracted the attention of researchers due to their advantages of high energy density, high safety and long cycle life. However, there is huge interfacial impedance between garnet-type electrolyte and lithium anode, which seriously impedes the normal operation of the cell. To solve this problem, a bit of liquid electrolyte is introduced into the interface between garnet-type electrolyte and lithium anode in this work, which obviously reduces the interfacial resistance, and makes the solid-state lithium symmetric cells cycle normally. Furthermore, the morphology composition, interfacial resistance and cycle stability of the interface layer between garnet-type electrolyte and lithium anode are studied by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The research results show that liquid electrolyte greatly decreases the interface resistance, especially at 80 ℃, the values are as low as 1.89 Ω·cm2 and 3.24 Ω·cm2 before and after cycling, respectively.

Key words: garnet-type solid-state electrolyte, lithium anode, interface, liquid electrolyte, interface resistance

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