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In this study, a beneficial role of Li\n                    <jats:sub>2<\/jats:sub>\n                    CO\n                    <jats:sub>3<\/jats:sub>\n                    in ASSBs featuring an oxyhalide\u2010based AlOCl\u20102LiCl (LAOC) solid\u2010state electrolyte (SSE) is revealed. ASSBs containing NCM with residual Li\n                    <jats:sub>2<\/jats:sub>\n                    CO\n                    <jats:sub>3<\/jats:sub>\n                    demonstrate superior electrochemical performance compared to those treated with a washing pretreatment to remove Li\n                    <jats:sub>2<\/jats:sub>\n                    CO\n                    <jats:sub>3<\/jats:sub>\n                    . Solid\u2010state nuclear magnetic resonance (ssNMR) spectroscopy shows that Li\n                    <jats:sub>2<\/jats:sub>\n                    CO\n                    <jats:sub>3<\/jats:sub>\n                    facilitates spontaneous Li\n                    <jats:sup>+<\/jats:sup>\n                    exchange at multiple sites within the LAOC SSE. This leads to faster ion mobility and shorter relaxation times at various lithium sites, indicating enhanced ion transport and improved interface dynamics. Moreover, the beneficial effects of Li\n                    <jats:sub>2<\/jats:sub>\n                    CO\n                    <jats:sub>3<\/jats:sub>\n                    are confirmed in other halide\u2010based ASSBs. This study uncovers an unexpected role for Li\n                    <jats:sub>2<\/jats:sub>\n                    CO\n                    <jats:sub>3<\/jats:sub>\n                    in halide\u2010based ASSBs, offering insights that may inspire further exploration of RLCs with functional properties for improving ASSBs performance.\n                  <\/jats:p>","DOI":"10.1002\/adma.202502067","type":"journal-article","created":{"date-parts":[[2025,6,2]],"date-time":"2025-06-02T09:26:20Z","timestamp":1748856380000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Revealing the Underlying Role of Li\n                    <sub>2<\/sub>\n                    CO\n                    <sub>3<\/sub>\n                    in Enhancing Performance of Oxyhalide\u2010Based Solid\u2010State Batteries"],"prefix":"10.1002","volume":"37","author":[{"given":"Han","family":"Wu","sequence":"first","affiliation":[{"name":"Shanghai jiao Tong University  800 Dongchuan Road Shanghai 200240 P. 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