Protecting lithium metal anode in all-solid-state batteries with a composite electrolyte
来源期刊：Rare Metals2021年第2期
论文作者：Wen-Qing Wei Bing-Qiang Liu Yi-Qiang Gan Hai-Jian Ma Da-Wei Cui
文章页码：409 - 416
摘 要：The volume of the metallic lithium anode in allsolid-state Li metal batteries increases significantly due to the lithium dendrite formation during the battery cycling,and the rough surface of lithium metal also reduces Li-ion transport in Li/electrolyte interface.In this work,we developed a solid polymer composite by adding the lowcost Si3 N4 particles to protect the lithium anode in allsolid-state batteries.The Fourier transform infrared spectroscopy（FTIR） data show that the surface of 10 wt %Si3 N4 particles interacts with the polyethylene oxide（PEO）and lithium bis（trifluoromethanesulfonyl）imide（LiTFSI）salt;the interaction restricts the anion mobility and improves the ionic conductivity(1 × 10-4 S·cm-1) and lithium-ion transference number（0.28） of the composite electrolyte.The lithium metal anode is well protected by the composite electrolyte in all-solid-state cells,including symmetric and Li/LiFePO4 cells.The lithium dendrite growth suppression by this composite electrolyte indicates the possible application of these low-cost composite electrolytes for lithium metal protection.
Wen-Qing Wei1,2，Bing-Qiang Liu1，Yi-Qiang Gan3，Hai-Jian Ma1，Da-Wei Cui1
1. School of Mechanical-electronic and Vehicle Engineering,Weifang University2. Department of Chemical and Materials Engineering,the University of Auckland3. College of Mechanical and Electronic Engineering,Shandong University of Science and Technology
摘 要：The volume of the metallic lithium anode in allsolid-state Li metal batteries increases significantly due to the lithium dendrite formation during the battery cycling,and the rough surface of lithium metal also reduces Li-ion transport in Li/electrolyte interface.In this work,we developed a solid polymer composite by adding the lowcost Si3 N4 particles to protect the lithium anode in allsolid-state batteries.The Fourier transform infrared spectroscopy（FTIR） data show that the surface of 10 wt %Si3 N4 particles interacts with the polyethylene oxide（PEO）and lithium bis（trifluoromethanesulfonyl）imide（LiTFSI）salt;the interaction restricts the anion mobility and improves the ionic conductivity(1 × 10-4 S·cm-1) and lithium-ion transference number（0.28） of the composite electrolyte.The lithium metal anode is well protected by the composite electrolyte in all-solid-state cells,including symmetric and Li/LiFePO4 cells.The lithium dendrite growth suppression by this composite electrolyte indicates the possible application of these low-cost composite electrolytes for lithium metal protection.
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