Precise Control of Li~+ Directed Transport via Electronegative Polymer Brushes on Polyolefin Separators for Dendrite-Free Lithium Deposition

Shujun Zheng; Lulu Mo; Kai ChenAi-Long ChenXu ZhangXiaoshan FanFeili LaiQingcong WeiYue-E MiaoTianxi LiuYan Yu

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Precise Control of Li~+ Directed Transport via Electronegative Polymer Brushes on Polyolefin Separators for Dendrite-Free Lithium Deposition

机译：Precise Control of Li~+ Directed Transport via Electronegative Polymer Brushes on Polyolefin Separators for Dendrite-Free Lithium Deposition

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Nonuniform ion flux triggers uneven lithium (Li) deposition and continuousdendrite growth, severely restricting the lifetime of Li-metal batteries (LMBs).Herein, an electronegative poly(pentafluorophenyl acrylate) (PPFPA) polymerbrush-grafted Celgard separator signed as PPFPA-g-Celgard is designed toprecisely construct one-dimensionally directed Li~+ flux at the nanoscale soas to realize faster ion transport and ultra-stable Li deposition. The graftingof PPFPA polymer chains is enabled by the simple bio-inspired engineeringof surface-initiated atom transfer radical polymerization chemistry. Boththeoretical and experimental analyses demonstrate an obvious increase byalmost two times in Li~+ affinity and ion transfer kinetics for PPFPA-g-Celgardover the Celgard separator. Reversible and stable Li plating/stripping can berealized by rapidly switching from 0.5 to 6 mA cm~(-2). Besides, the Li | PPFPAg-Celgard | LiFePO_4 full cell exhibits universal and long-term cyclability witha capacity retention of 83% over 700 cycles in ether electrolyte and 92.9% forover 300 cycles in carbonate electrolyte as well. This study represents a newdirection for the general design of advanced separators with typical surfacetopochemistry and self-limited ion transport channels in the application ofhigh-performance LMBs.

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《Advanced functional materials》 |2022年第41期|2201430.1-2201430.10|共10页
作者
Shujun Zheng; Lulu Mo; Kai ChenAi-Long ChenXu ZhangXiaoshan FanFeili LaiQingcong WeiYue-E MiaoTianxi LiuYan Yu;
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State Key Laboratory for Modification of Chemical Fibersand Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620, China;

Department of ChemistryKU LeuvenCelestijnenlaan 200F, Leuven 3001, Belgium;

Manufacturing of Fine ChemicalsKey Laboratory of Green Chemical Media and ReactionsMinistry of EducationHenan Engineering Laboratory of Chemical Pharmaceuticaland Biomedical MaterialsSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiState Key Laboratory for Modification of Chemical Fibersand Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620, China, Key Laboratory of Synthetic and Biological ColloidsMinistry of EducationSchool of Chemical aHefei National Research Center for Physical Sciences at the MicroscaleDepartment of Materials Science and EngineeringNational Synchrotron Radiation LaboratoryCAS Key Laboratory of Materials for Energy ConversionUniversity of Science and Technology of Chin;

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正文语种英语
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electrodepositions; functional separators; homogenized ion flux; polymer brushes; topochemical polymerizations;

Precise Control of Li~+ Directed Transport via Electronegative Polymer Brushes on Polyolefin Separators for Dendrite-Free Lithium Deposition

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