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Moreover, reports on their long\u2010term cycling performance with high\u2010voltage CAMs are not consistent. In this work, we verified that the penetration of lithium dendrites through the solid polymer electrolyte (SPE) indeed causes such \u201cnoisy voltage cell failure\u201d. This problem can be overcome by a simple modification of the SPE using higher molecular weight PEO, resulting in an improved cycling stability compared to lower molecular weight PEO. Furthermore, X\u2010ray photoelectron spectroscopy analysis confirms the formation of oxidative degradation products after cycling with NCM, for what Fourier transform infrared spectroscopy is not suitable as an analytical technique due to its limited surface sensitivity. Overall, our results help to critically evaluate and improve the stability of PEO\u2010based SSBs.<\/jats:p>","DOI":"10.1002\/anie.202218316","type":"journal-article","created":{"date-parts":[[2023,1,10]],"date-time":"2023-01-10T12:13:46Z","timestamp":1673352826000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":86,"title":["Evaluation and Improvement of the Stability of Poly(ethylene oxide)\u2010based Solid\u2010state Batteries with High\u2010Voltage Cathodes"],"prefix":"10.1002","volume":"62","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7690-0844","authenticated-orcid":false,"given":"Yuriy","family":"Yusim","sequence":"first","affiliation":[{"name":"Institute of Physical Chemistry Justus Liebig University Giessen  Heinrich-Buff-Ring 17 35392 Giessen Germany"},{"name":"Center for Materials Research (ZfM\/LaMa) Justus Liebig University Giessen  Heinrich-Buff-Ring 16 35392 Giessen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7482-9418","authenticated-orcid":false,"given":"Enrico","family":"Trevisanello","sequence":"additional","affiliation":[{"name":"Institute of Physical Chemistry Justus Liebig University Giessen  Heinrich-Buff-Ring 17 35392 Giessen Germany"},{"name":"Center for Materials Research (ZfM\/LaMa) Justus Liebig University Giessen  Heinrich-Buff-Ring 16 35392 Giessen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9274-4714","authenticated-orcid":false,"given":"Raffael","family":"Ruess","sequence":"additional","affiliation":[{"name":"Institute of Physical Chemistry Justus Liebig University Giessen  Heinrich-Buff-Ring 17 35392 Giessen Germany"},{"name":"Center for Materials Research (ZfM\/LaMa) Justus Liebig University Giessen  Heinrich-Buff-Ring 16 35392 Giessen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6587-7757","authenticated-orcid":false,"given":"Felix H.","family":"Richter","sequence":"additional","affiliation":[{"name":"Institute of Physical Chemistry Justus Liebig University Giessen  Heinrich-Buff-Ring 17 35392 Giessen Germany"},{"name":"Center for Materials Research (ZfM\/LaMa) Justus Liebig University Giessen  Heinrich-Buff-Ring 16 35392 Giessen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9670-5053","authenticated-orcid":false,"given":"Alexander","family":"Mayer","sequence":"additional","affiliation":[{"name":"Helmholtz Institute Ulm (HIU)  Helmholtzstra\u00dfe 11 89081 Ulm Germany"},{"name":"Karlsruhe Institute of Technology (KIT)  P.O. 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