5 V-Class 35.3 mAh cm-2 All-Solid-State Li Batteries

5 V-Class 35.3 mAh cm-2 All-Solid-State Li Batteries | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article 5 V-Class 35.3 mAh cm-2 All-Solid-State Li Batteries Yoon Seok Jung, Jun Pyo Son, Juhyoun Park, Hae-Yong Kim, Jae-Seung Kim, and 12 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4828390/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 03 Oct, 2025 Read the published version in Nature Energy → Version 1 posted You are reading this latest preprint version Abstract The advancement of battery technology has been impeded by the voltage constraints of electrolytes. Here, we present a high-energy all-solid-state battery (ASSB) design that achieves both a >5 V operation and an ultrahigh areal capacity of 35.3 mAh cm-2; these attributes were enabled by a new, highly conductive and ultrahigh voltage stable fluoride solid electrolyte (SE), LiCl–4Li2TiF6 (1.7 x 10-5 S cm-1 at 30 °C). This material provides over 100 times higher Li+ conductivity than Li2TiF6, attributable to the enlarged Li+ channels and increased Li+ concentration at the nanocrystallite interfaces, as proved by combined experimental and theoretical investigations. LiCl–4Li2TiF6 shields high-voltage spinel oxide cathodes, achieving excellent performance (e.g., 106 mAh g-1 at 2C and 30 °C with 75.2% retention after 500 cycles for LiNi0.5Mn1.5O4), sharply contrasting with the conventional LiNbO3 counterpart, which decomposes and fails to prevent detrimental interfacial degradation. The efficacy of LiCl–4Li2TiF6 is validated across various systems, including higher-voltage LiCoMnO4, cost-effective LiFe0.5Mn1.5O4, pouch-type LiNi0.5Mn1.5O4//Li ASSBs, operability down to 2.3 V with 258 mAh g-1, and 1.8 mm ultrathick electrodes. This newly proposed SE with over 5 V stability introduces a new design paradigm by revisiting the previously forbidden high-voltage cathodes for high-energy ASSBs. Physical sciences/Energy science and technology/Energy storage/Batteries Physical sciences/Energy science and technology/Energy storage/Batteries Physical sciences/Materials science/Materials for energy and catalysis/Batteries Physical sciences/Materials science/Materials for energy and catalysis/Batteries Physical sciences/Chemistry/Electrochemistry/Batteries Full Text Additional Declarations There is NO Competing Interest. Supplementary Files LiClLTFSuppRev241130subm2.docx Supplementary Information Cite Share Download PDF Status: Published Journal Publication published 03 Oct, 2025 Read the published version in Nature Energy → Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4828390","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":393727894,"identity":"75dd8f8b-e37f-4dcc-8495-218b108bb5f3","order_by":0,"name":"Yoon Seok 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Here, we present a high-energy all-solid-state battery (ASSB) design that achieves both a \u003e5 V operation and an ultrahigh areal capacity of 35.3 mAh cm-2; these attributes were enabled by a new, highly conductive and ultrahigh voltage stable fluoride solid electrolyte (SE), LiCl–4Li2TiF6 (1.7 x 10-5 S cm-1 at 30 °C). This material provides over 100 times higher Li+ conductivity than Li2TiF6, attributable to the enlarged Li+ channels and increased Li+ concentration at the nanocrystallite interfaces, as proved by combined experimental and theoretical investigations. LiCl–4Li2TiF6 shields high-voltage spinel oxide cathodes, achieving excellent performance (e.g., 106 mAh g-1 at 2C and 30 °C with 75.2% retention after 500 cycles for LiNi0.5Mn1.5O4), sharply contrasting with the conventional LiNbO3 counterpart, which decomposes and fails to prevent detrimental interfacial degradation. The efficacy of LiCl–4Li2TiF6 is validated across various systems, including higher-voltage LiCoMnO4, cost-effective LiFe0.5Mn1.5O4, pouch-type LiNi0.5Mn1.5O4//Li ASSBs, operability down to 2.3 V with 258 mAh g-1, and 1.8 mm ultrathick electrodes. 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