High-Voltage Resistance of PCL/PEO Blending Polymer-Based Solid Electrolyte for High-Temperature Lithium Metal Batteries

High-Voltage Resistance of PCL/PEO Blending Polymer-Based Solid Electrolyte for High-Temperature Lithium Metal 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 Research Article High-Voltage Resistance of PCL/PEO Blending Polymer-Based Solid Electrolyte for High-Temperature Lithium Metal Batteries Zhen-Yu Xiong, Guan-Hua Wang, Hong-Yu Wang, Peng-Yuan Li, Yang Sun, and 4 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7035741/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 13 You are reading this latest preprint version Abstract Polyethylene oxide (PEO) is regarded as the most promising candidate for the next generation solid polymer lithium metal batteries (LMBs). However, it suffers from low mechanical strength and limited electrochemical stability window (ESW), which restricts its application in high energy density LMBs. In this work, polycaprolactone (PCL) is chosen as the main matrix to fabricate a blending polymer-based electrolyte with PEO, which shows an improved electrochemical performance with a high lithium ion transference number of 0.65. The improvement can be attributed to the competition between ester and ether groups of different polymer chains, which can both interact with lithium ions to release more free cations. Moreover, the high-voltage resistance of PCL can broaden the electrochemical stability window to 4.8 V of PCL/PEO solid electrolyte to match LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode, and its high-temperature resistance ensure a satisfying dimensional stability for the assembled NCM811||Li cell to operate at 55 ℃, with a high initial specific capacity of 210 mAh/g and a retention of 95% within 100 cycles. This work provides a practical solution for the commercialization of high-voltage, high safety and high energy density solid lithium metal batteries for high temperature. Solid polymer electrolyte Polycaprolactone Polyethylene oxide High-voltage resistance High-temperature stability Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Editorial decision: Revision requested 26 Aug, 2025 Reviews received at journal 24 Aug, 2025 Reviews received at journal 23 Aug, 2025 Reviewers agreed at journal 10 Aug, 2025 Reviews received at journal 10 Aug, 2025 Reviewers agreed at journal 10 Aug, 2025 Reviewers agreed at journal 07 Aug, 2025 Reviewers agreed at journal 07 Aug, 2025 Reviewers agreed at journal 07 Aug, 2025 Reviewers invited by journal 07 Aug, 2025 Editor assigned by journal 07 Jul, 2025 Submission checks completed at journal 07 Jul, 2025 First submitted to journal 03 Jul, 2025 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. 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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-7035741","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":498460488,"identity":"439fb915-1762-4ee6-8e0f-31238e59c313","order_by":0,"name":"Zhen-Yu Xiong","email":"","orcid":"","institution":"Shenyang University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Zhen-Yu","middleName":"","lastName":"Xiong","suffix":""},{"id":498460489,"identity":"c5fd3b00-f51f-47a4-839d-332c79fbf0f6","order_by":1,"name":"Guan-Hua Wang","email":"","orcid":"","institution":"Ansteel Group Corporation 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However, it suffers from low mechanical strength and limited electrochemical stability window (ESW), which restricts its application in high energy density LMBs. In this work, polycaprolactone (PCL) is chosen as the main matrix to fabricate a blending polymer-based electrolyte with PEO, which shows an improved electrochemical performance with a high lithium ion transference number of 0.65. The improvement can be attributed to the competition between ester and ether groups of different polymer chains, which can both interact with lithium ions to release more free cations. Moreover, the high-voltage resistance of PCL can broaden the electrochemical stability window to 4.8 V of PCL/PEO solid electrolyte to match LiNi\u003csub\u003e0.8\u003c/sub\u003eCo\u003csub\u003e0.1\u003c/sub\u003eMn\u003csub\u003e0.1\u003c/sub\u003eO\u003csub\u003e2\u003c/sub\u003e (NCM811) cathode, and its high-temperature resistance ensure a satisfying dimensional stability for the assembled NCM811||Li cell to operate at 55 ℃, with a high initial specific capacity of 210 mAh/g and a retention of 95% within 100 cycles. This work provides a practical solution for the commercialization of high-voltage, high safety and high energy density solid lithium metal batteries for high temperature.\u003c/p\u003e","manuscriptTitle":"High-Voltage Resistance of PCL/PEO Blending Polymer-Based Solid Electrolyte for High-Temperature Lithium Metal Batteries","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-08-13 20:42:29","doi":"10.21203/rs.3.rs-7035741/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Revision requested","date":"2025-08-26T16:43:05+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2025-08-24T09:21:57+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2025-08-23T12:47:03+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"272846359819016846581510914201179024501","date":"2025-08-11T02:55:45+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2025-08-10T08:05:46+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"212984068978242887744472251957277722562","date":"2025-08-10T07:28:53+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"285331727871924599850029922937259690229","date":"2025-08-08T03:08:14+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"20123891035964084792628774034929316361","date":"2025-08-08T03:06:08+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"165346534668752651132938827171621587695","date":"2025-08-08T00:55:50+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2025-08-08T00:53:16+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2025-07-07T13:17:50+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2025-07-07T13:15:44+00:00","index":"","fulltext":""},{"type":"submitted","content":"Ionics","date":"2025-07-03T08:06:55+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"ionics","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"","sideBox":" Learn more about [Ionics](https://www.springer.com/journal/11581) ","snPcode":"11581","submissionUrl":"https://mc.manuscriptcentral.com/ionics","title":"Ionics","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false}}],"origin":"","ownerIdentity":"e9b72fc8-61fa-4643-949e-3501864f75b2","owner":[],"postedDate":"August 13th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"under-review","subjectAreas":[],"tags":[],"updatedAt":"2025-10-16T11:53:39+00:00","versionOfRecord":[],"versionCreatedAt":"2025-08-13 20:42:29","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-7035741","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-7035741","identity":"rs-7035741","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}