Synergistic Effect of Lithium Salts with Fillers and Solvents in Composite Electrolytes for Superior Room-Temperature Solid-State Lithium Batteries
作者:
Liu, L (Liu, Li) [1] ; Zhang, DC (Zhang, Dechao) [1] ; Zhao, JW (Zhao, Jingwei) [2] ; Shen, JD (Shen, Jiadong) [1] ; Li, FK (Li, Fangkun) [1] ; Yang, Y (Yang, Yan) [1] ; Liu, ZB (Liu, Zhengbo) [1] ; He, WX (He, Weixin) [1] ; Zhao, WM (Zhao, Weiming) [1] ; Liu, J (Liu, Jun) [1]
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DOI10.1021/acsaem.1c04001
在线发表FEB 2022
已索引2022-03-03
文献类型Article; Early Access
摘要
To achieve superior solid-state lithium batteries, we have fabricated a flexible composite solid electrolyte (CSE) membrane composed of a poly(vinylidene fluoride) (PVDF) matrix, high-concentration lithium salt (LiTFSI), solvent (DMF), and ceramic filler Li1.3Al0.3Ti1.7(PO4)(3) (LATP). A small quantity of polar solvent DMF can not only facilitate the dissociation of LiTFSI but also form lithium-rich complexes [Li(DMF)(n)TFSI] with Li+, which have the properties of ionic liquids and can improve ionic conductivity. Meanwhile, high-concentration LiTFSI provides a large number of free lithium ions, and TFSI- anions also aggregate to form ion clusters, which pass through the interconnecting network of the filler LATP to form a unique fast conduction channel. Thanks to the synergistic effect between the various components of the LATP-PVDF/Li CSE, the obtained CSE achieves a high ionic conductivity of 2.44 x 10(-4) S cm(-1) (25 degrees C), an excellent electrochemical stability window of up to 4.8 V (vs Li+/Li), and desirable self-extinguishing ability. In addition, the CSE exhibits excellent lithium dendrite inhibition ability, which has been verified by periodic lithium stripping/plating tests for more than 3000 h. All of the assembled solid-state LiFePO4 parallel to Li, LiCoO2 parallel to Li, and LiNi0.6Co0.2Mn0.2O2 parallel to Li cells exhibit distinguished rate performance and cycling stability at 30 degrees C. Furthermore, the LiFePO4 parallel to Li solid-state pouch batteries also exhibit excellent flexibility and safety. This investigation demonstrates the importance of the synergistic strategy between the various components of the CSE and opens up ideas for the research and development of high-performance CSEs.
关键词
作者关键词lithium metal batteriescomposite solid electrolyteLiTFSIpoly(vinylidene fluoride)polymer-in-salt electrolyte
Keywords PlusPOLYMER ELECTROLYTEDENDRITE-FREEPOLY(VINYLIDENE FLUORIDE)HYBRID ELECTROLYTESIONIC-CONDUCTIVITYMETAL ANODESTABILITYTRANSPORTCATHODE
作者信息
通讯作者地址
Liu, Jun
(通讯作者)
South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Peoples R China
通讯作者地址
Zhao, Jingwei
(通讯作者)
Guangzhou Tinci Mat Technol Co Ltd, Res & Dev Ctr, Guangzhou 510765, Peoples R China
地址
1 South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Peoples R China
2 Guangzhou Tinci Mat Technol Co Ltd, Res & Dev Ctr, Guangzhou 510765, Peoples R China
电子邮件地址zhaojingwei@tinci.commsjliu@scut.edu.cn
类别/分类
研究方向ChemistryEnergy & FuelsMaterials Science