Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 15, Pages 18614-18622Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.06.085
Keywords
Solid-state battery; Composite solid electrolyte; Lanthanum zirconate fiber; Sandwich structure; Interface; Room-temperature performance
Categories
Funding
- National Natural Science Foundation of China [51474113, 51874146]
- Technical Innovation Project of Changsha Mining and Metallurgical Institute of China Minmetals Co., Ltd [20180141]
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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 mu m 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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