Abstract
The composite separator PP-CPE was created by coating the polypropylene (PP) separator with the composite polymer electrolyte (CPE), which is made up of Li6.4La3Zr1.4Ta0.6O12 (LLZTO) and polyvinylidene fluoride hexafluoropropylene (PVDF-HFP). To compensate for the inequalities in Li+ flux movement caused by the conventional PP separator, this new separator features several rapid Li+ channels along on the PVDF-HFP, LLZTO, and PVDF-HFP/LLZTO interfaces. To ensure that lithium ions are uniformly deposited on the anode, CPE layers can be utilized to immobilize anions and control their movement. The Cu/Li battery with modified separator PP-CPE circulates 300 times at 1 mA cm−2, and the Coulombic efficiency is more than 98.1%. The Li symmetrical battery can cycle stably for more than 600 h and maintain a stable overpotential. The capacity of the LFP/Li battery loaded with 10 mg cm−2 decreased to 126 mAh g−1 when 300 cycles were performed at 1C, and the Coulombic efficiency over 99.3%. This effective and simple separator modification strategy can reduce the formation and growth of lithium dendrites, which leads to higher coulombic efficiency and better cycle stability.
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The findings of this study are supported by data which can be made available by the corresponding author upon a reasonable institutional request.
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Authors would like to thank Engineering Research Centre of High-Performance Polymer, Qingdao University of Science and Technology for financial support.
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YCG: investigation, validation, formal analysis, and writing—original draft. HQL: electrochemical characterization testing participation, helped with solid polymer electrolytes preparation, conceptualization, supervision, writing—review and editing, and funding acquisition. All authors read and approved the final manuscript.
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Gu, Y., Liu, H. Inhibition of lithium dendrite growth in composite separator for semi-solid-state lithium metal batteries. Ionics 29, 3067–3076 (2023). https://doi.org/10.1007/s11581-023-05044-5
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DOI: https://doi.org/10.1007/s11581-023-05044-5