Enhancing Hydrophilicity of Thick Electrodes for High Energy Density Aqueous Batteries

作     者：Jungeun Lee Hyeonsoo Lee Cheol Bak Youngsun Hong Daeha Joung Jeong Beom Ko Yong Min Lee Chanhoon Kim Jungeun Lee;Hyeonsoo Lee;Cheol Bak;Youngsun Hong;Daeha Joung;Jeong Beom Ko;Yong Min Lee;Chanhoon Kim

作者机构：Sustainable Technology and Wellness R&D GroupKorea Institute of Industrial Technology(KITECH)102 Jejudaehak-RoJeju-SiJeju-do 63243Republic of Korea Department of Energy Science and EngineeringDaegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Republic of Korea Department of PhysicsVirginia Commonwealth UniversityRichmondVA 23284USA 

出 版 物：《Nano-Micro Letters》 (纳微快报（英文版）)

年 卷 期：2023年第15卷第7期

页      面：110-121页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(No.2022R1F1A1070168,2020R1C1C1004322) the Korea Institute of Industrial Technology as Development of core technology for smart wellness care based on cleaner production process technology(KITECH-PEH23030) supported by the Renewable Surplus Sector Coupling Technology Program of the Korea Institute of Energy Technology Evaluation and Planning(KETEP)granted financial resource from the Ministry of Trade,Industry&Energy,Republic of Korea(No.20226210100050) the National Research Council of Science&Technology(NST)grant by the Korea government(MSIT)(No.CPS21141-100)。 

主　　题：Thick electrodes Hydrophilic binder Sulfonation Aqueous zinc-ion batteries High areal capacity 

摘      要：Thick electrodes can substantially enhance the overall energy density of batteries.However,insufficient wettability of aqueous electrolytes toward electrodes with conventional hydrophobic binders severely limits utilization of active materials with increasing the thickness of electrodes for aqueous batteries,resulting in battery performance deterioration with a reduced capacity.Here,we demonstrate that controlling the hydrophilicity of the thicker electrodes is critical to enhancing the overall energy density of batteries.Hydrophilic binders are synthesized via a simple sulfonation process of conventional polyvinylidene fluoride binders,considering physicochemical properties such as mechanical properties and adhesion.The introduction of abundant sulfonate groups of binders(i)allows fast and sufficient electrolyte wetting,and(ii)improves ionic conduction in thick electrodes,enabling a significant increase in reversible capacities under various current densities.Further,the sulfonated binder effectively inhibits the dissolution of cathode materials in reactive aqueous electrolytes.Overall,our findings significantly enhance the energy density and contribute to the development of practical zinc-ion batteries.