Journal
IONICS
Volume 28, Issue 7, Pages 3243-3253Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-022-04599-z
Keywords
Composite solid electrolyte; Sandwich structure; Lithium dendrite; Solid-state lithium metal battery
Funding
- Science and Technology Commission of Shanghai Municipality [21ZR1424900, 19DZ2271100]
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A sandwich-structured composite solid electrolyte was successfully designed and prepared, demonstrating good mechanical and electrochemical stability, high ionic conductivity, and a wide electrochemical stable window. The related lithium batteries exhibited high specific capacity and excellent cycling performance, while the pouch battery showed outstanding safety and functionality.
It is crucial to develop solid electrolyte with good mechanical and electrochemical stability for the application of lithium metal battery. In this work, a sandwich-structured composite solid electrolyte is designed and prepared based on the blend of polyvinylidene fluoride-hexafluoropropylene/polyacrylonitrile (PVDF-HFP/PAN) polymer, Li6.46La3Zr1.46Ta0.54O12 as filler, and a layer of PE film is introduced in the middle to act as a skeleton. The sandwich-structured PVDF-HFP/PAN-10%LLZTO-PE composite solid electrolyte displays a tensile strength of 66.58 MPa, high ionic conductivity of 2.28 x 10(-4) S/m at 25 degrees C, wide electrochemical stable window of 4.8 V, and high lithium ion transfer number of 0.44. The LiFePO4 | PVDF-HFP/PAN-10%LLZTO-PE | Li coin battery shows a high specific capacity of 161.9 mAh/g and retains 150.2 mAh/g after 300 cycles at 1 C. Furthermore, the LiFePO4 | PVDF-HFP/PAN-10%LLZTO-PE | Li pouch battery shows excellent safety and functionality.
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