Yue Zhang, Jun-Hong Li, Man Ge, Yun-Hui Huang, Heng-Hui Xu
{"title":"Transparent PVDF-based electrolyte enabled by lipophilic lithium magnesium silicate for solid-state lithium batteries","authors":"Yue Zhang, Jun-Hong Li, Man Ge, Yun-Hui Huang, Heng-Hui Xu","doi":"10.1007/s12598-024-02858-8","DOIUrl":null,"url":null,"abstract":"<p>Solid-state batteries with solid polymer electrolytes are considered the most promising due to their high energy density and safety advantages. However, their development is hindered by the limitations of polymer electrolytes, such as low ionic conductivity, poor mechanical strength and inadequate fire resistance. This study presents a thin polyvinylidene fluoride-based composite solid electrolyte film (25 μm) incorporating two-dimensional modified lipophilic lithium magnesium silicate (LLS) as additives with good dispersibility. The incorporation of LLS promotes grain refinement in polyvinylidene fluoride (PVDF), enhances the densification of electrolyte films, increases the tensile strength to 10.42 MPa and the elongation to 251.58%, improves ion transport interface, and facilitates uniform deposition of lithium ions. Furthermore, LLS demonstrates strong adsorption ability, promoting the formation of solvated molecules, resulting in high ionic conductivity (2.07 × 10<sup>−4</sup> S·cm<sup>−1</sup> at 30 °C) and a stable lithium/electrolyte interface. Symmetric Li//Li cells assembled with the thin composite electrolytes exhibit stable cycling for 2000 h at 0.1 mA·cm<sup>−2</sup> and 0.05 mAh·cm<sup>−2</sup>. Additionally, the LiFePO<sub>4</sub>//Li battery shows a capacity retention rate of 99.9% after 200 cycles at 0.5C and room temperature.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\n","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":null,"pages":null},"PeriodicalIF":9.6000,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Rare Metals","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s12598-024-02858-8","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Solid-state batteries with solid polymer electrolytes are considered the most promising due to their high energy density and safety advantages. However, their development is hindered by the limitations of polymer electrolytes, such as low ionic conductivity, poor mechanical strength and inadequate fire resistance. This study presents a thin polyvinylidene fluoride-based composite solid electrolyte film (25 μm) incorporating two-dimensional modified lipophilic lithium magnesium silicate (LLS) as additives with good dispersibility. The incorporation of LLS promotes grain refinement in polyvinylidene fluoride (PVDF), enhances the densification of electrolyte films, increases the tensile strength to 10.42 MPa and the elongation to 251.58%, improves ion transport interface, and facilitates uniform deposition of lithium ions. Furthermore, LLS demonstrates strong adsorption ability, promoting the formation of solvated molecules, resulting in high ionic conductivity (2.07 × 10−4 S·cm−1 at 30 °C) and a stable lithium/electrolyte interface. Symmetric Li//Li cells assembled with the thin composite electrolytes exhibit stable cycling for 2000 h at 0.1 mA·cm−2 and 0.05 mAh·cm−2. Additionally, the LiFePO4//Li battery shows a capacity retention rate of 99.9% after 200 cycles at 0.5C and room temperature.
期刊介绍:
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.