Binder Chemistry Dependent Electrolyte Reduction in Potassium-Ion Batteries: A Successive, Two-Step Reduction Way

Wang Zhou; Bingchen He; Lijiao QuanRuhong LiYuqing ChenChangling FanShi ChenChaohe XuXiulin FanLidan XingJilei Liu

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Binder Chemistry Dependent Electrolyte Reduction in Potassium-Ion Batteries: A Successive, Two-Step Reduction Way

机译：Binder Chemistry Dependent Electrolyte Reduction in Potassium-Ion Batteries: A Successive, Two-Step Reduction Way

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Controlling electrode/electrolyte interfacial chemistry is critically importantfor improved K~+ storage, but the influences of binder chemistry on electrolytedecomposition and interfacial properties are still poorly understood.Herein, sodium carboxymethyl cellulose (CMC)-based, and polyvinylidenefluoride (PVDF)-based graphite electrodes are introduced as model systemsto quantify the electrolyte decomposition, solid electrolyte interphase (SEI)formation, and the corresponding kinetic evolution transition. A noncatalyticelectrolyte reduction path on the CMC-based electrode and a catalyticreduction path on the PVDF-based electrode are identified, in terms of thereduction overpotential and product selectivity. The electrolyte reductionand/or SEI formation are found to occur in a successive, two-step manner,starting with the electrochemical reduction at a potential above 0.35 V whereno potassiation has happened (step Ⅰ), and followed by the thermodynamicallyaccelerated electrolyte reduction at a potential below 0.35 V (step Ⅱ).Kinetics analysis reveals the former is charge transfer-controlled for bothCMC and PVDF-based electrodes, and the latter involves a kinetic transitionto SEI resistance controlled for the PVDF system, while it is chargetransfer-controlled for the CMC system. All these examples, highlight thatbinder chemistry plays a dominant role in the electrolyte decomposition andelectrode/electrolyte interfacial properties, and promote a better fundamentalunderstanding of electrolyte reduction.

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《Advanced energy materials》 |2023年第2期|2202874.1-2202874.11|共11页
作者
Wang Zhou; Bingchen He; Lijiao QuanRuhong LiYuqing ChenChangling FanShi ChenChaohe XuXiulin FanLidan XingJilei Liu;
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Joint Key Laboratory of the Ministry of EducationInstitute of Applied Physics and Materials EngineeringUniversity of MacauMacau 999078, China;

Engineering Research Center of MTEES (Ministry of Education)Research Center of BMET (Guangdong Province)Engineering Lab. of OFMHEB (Guangdong Province)Key Lab. of ETESPG (GHEI)and Innovative Platform for ITBMD (Guangzhou Municipality)School of Chemistry a;

College of Materials Science and EngineeringHunan Joint International Laboratory of Advanced Materialsand Technology of Clean EnergyHunan Province Key Laboratory for AdvancedCarbon Materials and Applied TechnologyHunan UniversityChangsha 410082, ChinaState Key Laboratory of Silicon MaterialsSchool of Materials Science and EngineeringZhejiang UniversityHangzhou 310027, ChinaCollege of Aerospace EngineeringChongqing UniversityChongqing 400044, China;

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binder; interfacial chemistry; K~+ ions storage; kinetic transition; reduction selectivity;

Binder Chemistry Dependent Electrolyte Reduction in Potassium-Ion Batteries: A Successive, Two-Step Reduction Way

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