Improving room-temperature electrochemical performance of solid-state lithium battery by using electrospun La2Zr2O7 fibers-filled composite solid electrolyte |
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| Affiliation: | 1. Institute for Advanced Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang, 212013, China;2. Institute of Clean Energy & Advanced Material, Southwest University, Chongqing, 400715, China;3. Changsha Research Institute of Mining and Metallurgy, Co., Ltd., Changsha, 410012, China;1. Electro-Materials Research Laboratory, Centre for Nanoscience and Technology, Pondicherry University, Puducherry, 605014, India;2. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China;1. College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, People⿿s Republic of China;2. Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, People⿿s Republic of China;1. State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China;2. Zhejiang Provincial Key Laboratory for Cutting Tools, College of Physics & Electronic Engineering, Taizhou University, Taizhou, 318000, China |
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| Abstract: | Low ionic conductivity at room temperature and poor interfacial compatibility are the main obstacles to restrain the practical application of polymer solid electrolytes. In this work, lanthanum zirconate (LZO) fibers were prepared by electrospinning method and used for the first time as fillers in sandwich polypropylene carbonate (PPC)-based solid electrolyte. Meanwhile, a graphite coating was applied on one surface of the composite solid electrolyte (CSE) membrane. The results show that the LZO fibers significantly increases the room-temperature electrochemical performance of the CSE, and the graphite coating enhances the interfacial compatibility between electrolyte and lithium anode. Furthermore, an ultra-thin PPC-LZO CSE with a total thickness of 22 μm was prepared and used in NCM622/CSE/Li solid-state cell, which shows an initial discharge capacity of 165.6 mAh/g at the current density of 0.5C and a remaining capacity of 113.0 mAh/g after 250 cycles at room temperature. Rise to 1C, the cell shows an initial discharge capacity of 154.2 mAh/g with a remaining capacity of 95.6 mAh/g after 250 cycles. This ultra-thin CSE is expected to be widely applied in high energy-density solid-state battery with excellent room-temperature electrochemical performances. |
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| Keywords: | Solid-state battery Composite solid electrolyte Lanthanum zirconate fiber Sandwich structure Interface Room-temperature performance |
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