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Ion Coordination and Transport in Magnesium Polymer Electrolytes Based on Polyester-co-Polycarbonate

查看全文 作　　者：Bumjun [1]Park;Rassmus [2]Andersson;Sarah [1]G.Pate;Jiacheng [1]Liu;Casey PO’[1]Brien;Guiomar [2]Hernández;Jonas [2]Mindemark;Jennifer [1]L.Schaefer 高影响力作者 机构地区：[1]Department of Chemical and Biomolecular Engineering,University of Notre Dame,Notre Dame,IN 46556,USA;[2]Department of Chemistry-Ångström Laboratory,Uppsala University,Box 538,SE-75121 Uppsala,Sweden高影响力机构 出　　处：《Energy Material Advances》索引2021年第1期,共14页高影响力期刊 基　　金：We thank Prof.Ruilan Guo for DSC instrumentation and Tatyana Orlova and the University of Notre Dame Integrated Imaging Facilities for SEM.JM,GH,and RA acknowledge the financial support from STandUP for Energy.JLS,BP,and JL acknowledge the partial financial support from NSF CBET-1706370. 摘　　要：Magnesium-ion-conducting solid polymer electrolytes have been studied for rechargeable Mg metal batteries,one of the beyond-Li-ion systems.In this paper,magnesium polymer electrolytes with magnesium bis(trifluoromethane)sulfonimide(Mg(TFSI)2)salt in poly(ε-caprolactone-co-trimethylene carbonate)(PCL-PTMC)were investigated and compared with the poly(ethylene oxide)(PEO)analogs.Both thermal properties and vibrational spectroscopy indicated that the total ion conduction in the PEO electrolytes was dominated by the anion conduction due to strong polymer coordination with fully dissociated Mg2+.On the other hand,in PCL-PTMC electrolytes,there is relatively weaker polymer–cation coordination and increased anion–cation coordination.Sporadic Mg-and F-rich particles were observed on the Cu electrodes after polarization tests in Cu|Mg cells with PCL-PTMC electrolyte,suggesting that Mg was conducted in the ion complex form(MgxTFSIy)to the copper working electrode to be reduced which resulted in anion decomposition.However,the Mg metal deposition/stripping was not favorable with either Mg(TFSI)2 in PCL-PTMC or Mg(TFSI)2 in PEO,which inhibited quantitative analysis of magnesium conduction.A remaining challenge is thus to accurately assess transport numbers in these systems. 关 键 词：MAGNESIUM conduction ANION
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