Exceptional Li-Rich Mn-Based Cathodes Enabled by Robust Interphase and Modulated Solvation Microstructures Via Anion Synergistic Strategy

Jiaxin Liu; Tao Dong; Xuedi YuanYingyue CuiYawei LiuChao ChenHongyun MaChang SuHaitao ZhangSuojiang Zhang

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Exceptional Li-Rich Mn-Based Cathodes Enabled by Robust Interphase and Modulated Solvation Microstructures Via Anion Synergistic Strategy

机译：Exceptional Li-Rich Mn-Based Cathodes Enabled by Robust Interphase and Modulated Solvation Microstructures Via Anion Synergistic Strategy

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Coupling Li-rich Mn-based oxide (LRMO) cathodes with lithium metal anodesis crucial to enabl high-energy batteries. However, capacity decline of LRMOcaused generally by unexpected parasitic reactions needs to be solved.Herein, an anion synergistic strategy is developed to manipulate thesolvation structure to boost the electrochemical performance of high-voltagelithium batteries. Multi-salt electrolytes containing TFSI?, DFOB?, andDFBOP? anions are formulated via facilitating a distinctive aggregate,Li~+-(DFBOP?)_(0.10)(DFOB?)_(0.49)(TFSI?)_(0.51)EC_(0.63)EMC_(2.49)DEC_(0.77), which canreduce the penetration of other anions into the first solvation sheath andstrengthen the interaction between Li+ ions and solvent moleculessimultaneously. The solvation structure is studied by molecular dynamics(MD) and its feature is found to be able to enhance the transport kinetics ofLi~+ effectively and favor the formation of an inorganic-rich interphase.Corrosion of the Al collector is retarded effectively by a cathode?electrolyteinterphase (CEI) constructed by the decomposition of DFBOP?, therebyenhancing the cyclability. In addition, Li‖LRMO cell can retain its 85% initialcapacity after 650 cycles at 1 C. This study provides a guideline to formulatehigh-voltage electrolytes with excellent kinetics by regulating themicrostructures of solvation and interphases via anion formulationengineering.

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来源
《Advanced energy materials》 |2023年第24期|2300680.1-2300680.13|共13页
作者
Jiaxin Liu; Tao Dong; Xuedi YuanYingyue CuiYawei LiuChao ChenHongyun MaChang SuHaitao ZhangSuojiang Zhang;
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作者单位

College of Chemical EngineeringShenyang University of Chemical TechnologyShenyang 110142, P. R. China,Beijing Key Laboratory of Ionic Liquids Clean Process, CAS KeyLaboratory of Green Process and Engineering, Institute of ProcessEngineeringChinese Academy;

Beijing Key Laboratory of Ionic Liquids Clean Process, CAS KeyLaboratory of Green Process and Engineering, Institute of ProcessEngineeringChinese Academy of SciencesBeijing 100190, P. R. China;

Tianjin Lishen Battery Joint-stock Co., LtdTianjin 300384, P. R. ChinaCollege of Chemical EngineeringShenyang University of Chemical TechnologyShenyang 110142, P. R. ChinaCollege of Chemical EngineeringShenyang University of Chemical TechnologyShenyang 110142, P. R. China;

Beijing Key Laboratory of Ionic Liquids Clean Process, CAS KeyLaboratory of Green Process and Engineering, Institute of ProcessEngineeringChinese AcademyBeijing Key Laboratory of Ionic Liquids Clean Process, CAS KeyLaboratory of Green Process and Engineering, Institute of ProcessEngineeringChinese Academy of SciencesBeijing 100190, P. R. China;

Henan Key Laboratory of Energy Storage Materials and Processes;

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正文语种英语
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anion synergistic effect; interfacial chemistry; Li-rich Mn-based; solvation structure;

Exceptional Li-Rich Mn-Based Cathodes Enabled by Robust Interphase and Modulated Solvation Microstructures Via Anion Synergistic Strategy

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