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Using NCM811 as a model material, the elimination of water impurities from the ambient atmosphere and the NO\n                    <jats:sub>2<\/jats:sub>\n                    BF\n                    <jats:sub>4<\/jats:sub>\n                    strongly improves agreement between targeted and measured lithium contents and lowers proton insertion. The proton content after chemical delithiation is determined via prompt gamma activation analysis (PGAA) and a novel method based on thermogravimetric analysis coupled with mass spectrometry (TGA-MS). The structure of chemically delithiated NCM811 materials is examined with X-ray diffraction (XRD) and high-resolution scanning transmission electron microscopy (HR-STEM), including their structural evolution upon annealing, which induces oxygen release and separation into rock-salt and fully lithiated NCM811 bulk structures. Charge\/discharge cycling and differential capacity analysis of strongly delithiated NCM811 show that extensive chemical delithiation can degrade particle surfaces.\n                  <\/jats:p>","DOI":"10.1149\/1945-7111\/aea9d3","type":"journal-article","created":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T08:37:52Z","timestamp":1792053472000},"page":"200506","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Chemical Delithiation of Ni-Rich NCM Materials: Quantification and Minimization of the Concomitant Proton Intercalation"],"prefix":"10.1149","volume":"173","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-6945-931X","authenticated-orcid":true,"given":"Corbinian","family":"Gr\u00f6n","sequence":"first","affiliation":[{"name":"Chair of Technical Electrochemistry"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3459-9683","authenticated-orcid":true,"given":"Simon","family":"Qian","sequence":"additional","affiliation":[{"name":"Chair of Technical Electrochemistry"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-6042-402X","authenticated-orcid":true,"given":"Maxime","family":"Boniface","sequence":"additional","affiliation":[{"name":"Department of Inorganic Chemistry"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7747-8545","authenticated-orcid":true,"given":"L\u00e1szl\u00f3","family":"Szentmikl\u00f3si","sequence":"additional","affiliation":[{"name":"Institute for Energy Security and Environmental Safety"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9598-2913","authenticated-orcid":true,"given":"Bogl\u00e1rka","family":"Mar\u00f3ti","sequence":"additional","affiliation":[{"name":"Institute for Energy Security and Environmental Safety"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5031-8488","authenticated-orcid":true,"given":"Ildik\u00f3","family":"Hars\u00e1nyi","sequence":"additional","affiliation":[{"name":"Institute for Energy Security and Environmental Safety"},{"name":"HUN-REN Wigner Research Centre for Physics"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8957-4216","authenticated-orcid":true,"given":"Thomas","family":"Lunkenbein","sequence":"additional","affiliation":[{"name":"Department of Inorganic Chemistry"},{"name":"Bavarian Center for Battery Technology (BayBatt) and Chair of Operando Analytics for Electrochemical Energy Storage"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8199-8703","authenticated-orcid":true,"given":"Hubert A.","family":"Gasteiger","sequence":"additional","affiliation":[{"name":"Chair of Technical Electrochemistry"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"77","published-online":{"date-parts":[[2026,10,15]]},"reference":[{"key":"jesaea9d3bib1","doi-asserted-by":"publisher","DOI":"10.1016\/j.est.2023.108875","type":"journal-article","volume":"73","author":"Britala","year":"2023","journal-title":"J. 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