{"title":"A binary eutectic electrolyte design for high-temperature interface-compatible Zn-ion batteries","authors":"","doi":"10.1016/j.jechem.2024.09.068","DOIUrl":null,"url":null,"abstract":"<div><div>The deterioration of aqueous zinc-ion batteries (AZIBs) is confronted with challenges such as unregulated Zn<sup>2+</sup> diffusion, dendrite growth and severe decay in battery performance under harsh environments. Here, a design concept of eutectic electrolyte is presented by mixing long chain polymer molecules, polyethylene glycol dimethyl ether (PEGDME), with H<sub>2</sub>O based on zinc trifluoromethyl sulfonate (Zn(OTf)<sub>2</sub>), to reconstruct the Zn<sup>2+</sup> solvated structure and in situ modified the adsorption layer on Zn electrode surface. Molecular dynamics simulations (MD), density functional theory (DFT) calculations were combined with experiment to prove that the long-chain polymer-PEGDME could effectively reduce side reactions, change the solvation structure of the electrolyte and priority absorbed on Zn(002), achieving a stable dendrite-free Zn anode. Due to the comprehensive regulation of solvation structure and zinc deposition by PEGDME, it can stably cycle for over 3200 h at room temperature at 0.5 mA/cm<sup>2</sup> and 0.5 mAh/cm<sup>2</sup>. Even at high-temperature environments of 60 °C, it can steadily work for more than 800 cycles (1600 h). Improved cyclic stability and rate performance of aqueous Zn||VO<sub>2</sub> batteries in modified electrolyte were also achieved at both room and high temperatures. Beyond that, the demonstration of stable and high-capacity Zn||VO<sub>2</sub> pouch cells also implies its practical application.</div></div>","PeriodicalId":15728,"journal":{"name":"Journal of Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":13.1000,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Energy Chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2095495624007150","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Energy","Score":null,"Total":0}
引用次数: 0
Abstract
The deterioration of aqueous zinc-ion batteries (AZIBs) is confronted with challenges such as unregulated Zn2+ diffusion, dendrite growth and severe decay in battery performance under harsh environments. Here, a design concept of eutectic electrolyte is presented by mixing long chain polymer molecules, polyethylene glycol dimethyl ether (PEGDME), with H2O based on zinc trifluoromethyl sulfonate (Zn(OTf)2), to reconstruct the Zn2+ solvated structure and in situ modified the adsorption layer on Zn electrode surface. Molecular dynamics simulations (MD), density functional theory (DFT) calculations were combined with experiment to prove that the long-chain polymer-PEGDME could effectively reduce side reactions, change the solvation structure of the electrolyte and priority absorbed on Zn(002), achieving a stable dendrite-free Zn anode. Due to the comprehensive regulation of solvation structure and zinc deposition by PEGDME, it can stably cycle for over 3200 h at room temperature at 0.5 mA/cm2 and 0.5 mAh/cm2. Even at high-temperature environments of 60 °C, it can steadily work for more than 800 cycles (1600 h). Improved cyclic stability and rate performance of aqueous Zn||VO2 batteries in modified electrolyte were also achieved at both room and high temperatures. Beyond that, the demonstration of stable and high-capacity Zn||VO2 pouch cells also implies its practical application.
期刊介绍:
The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies.
This journal focuses on original research papers covering various topics within energy chemistry worldwide, including:
Optimized utilization of fossil energy
Hydrogen energy
Conversion and storage of electrochemical energy
Capture, storage, and chemical conversion of carbon dioxide
Materials and nanotechnologies for energy conversion and storage
Chemistry in biomass conversion
Chemistry in the utilization of solar energy