期刊
CHEMICAL ENGINEERING JOURNAL
卷 406, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126754
关键词
Succinonitrile; Lithium metal; Solid-state electrolyte; Solid-state lithium batteries; UV-irradiation
资金
- National Key R&D Program of China [2018YFB0905400]
- National Natural Science Foundation of China (NSFC) [51772315]
- Shanghai Engineering Research Center of Inorganic Energy Materials and Electric Power Sources [18DZ2280800]
A new type of highly Li+ conductive and mechanically strong composite solid-state electrolyte, SN-CSSE, was developed for room-temperature solid-state lithium battery with excellent ionic conductivity and cycling stability. The electrolyte showed wide electrochemical window, strong mechanical strength, and high interfacial compatibility with Li, demonstrating great potential for safety-critical battery systems.
In this work, a new type of highly Li+ conductive, scalable, deformable succinonitrile-based composite solid-state electrolyte (denoted as SN-CSSE) is proposed as a promising solid electrolyte for room-temperature solid-state lithium battery (SSLB). The electrospinning poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) framework and UV-irradiation method are applied to improve the mechanical properties of SN. To overcome the side reactions on lithium (Li) anode, the concentrated lithium salt is exploited to anchor SN molecules within solvent-Li+ associations, which avoids direct contact between SN and Li metal and realize uniform Li deposition. Owing to the unique structural integration, the SN-CSSE exhibits high ionic conductivity of 1.1 x 10(-3) S.cm(-1) at 30 degrees C, wide electrochemical window (0 similar to 5.1 V vs. Li+/Li), favorable mechanical strength (4.76 MPa), and excellent interfacial compatibility with Li (stable at a current density of 0.2 mA.cm(-2) for over 500 h). The LiFePO4/Li cells provide an outstanding rate capability (5C) and cycling performance (a retention of 95% after 800 cycles at 1C). Moreover, the solid-state pouch cell displays a favorable capacity of 15.6 mAh and maintains good cycling stability without significant capacity degradation after 150 cycles. Even under different abuse conditions, the cell still operated well, portending high application potential in safety-required battery systems.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据