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However, intrinsic lithium and oxygen vacancies formed during high\u2010temperature sintering can lead to interfacial metal reduction and phase transitions, ultimately causing short circuits. In this study, we quantified these intrinsic vacancies in Li\n                    <jats:sub>6.5<\/jats:sub>\n                    La\n                    <jats:sub>3<\/jats:sub>\n                    Zr\n                    <jats:sub>1.5<\/jats:sub>\n                    Ta\n                    <jats:sub>0.5<\/jats:sub>\n                    O\n                    <jats:sub>12<\/jats:sub>\n                    (LLZTO) and proposed a strategy to achieve vacancy\u2010suppressed, lithium\u2010stuffed garnet SEs by simply tuning the lithium content in both the green pellet and bedding powder during sintering. The optimized Li\u2010stuffed LLZTO exhibited lithium occupancy exceeding 6.5 per formula unit (pfu) and oxygen\u2010vacancy concentrations below 0.02 pfu, resulting in improved chemical stability at the electrolyte\u2013electrode interface and enhanced air stability. The garnet electrolyte demonstrated a critical current density of 1.00\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    at 30\u00b0C and 1.75\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    at 60\u00b0C, along with stable cycling performance over 3000\u00a0h in lithium symmetric cells and 2000 cycles in hybrid full\u2010cells, demonstrating 90% capacity retention. These findings highlight the pivotal role of intrinsic vacancy control in enhancing the structural and electrochemical integrity of garnet electrolytes, thereby promoting their practical application in ASSBs.\n                  <\/jats:p>","DOI":"10.1002\/advs.202522562","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T10:54:30Z","timestamp":1772967270000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Vacancy\u2010Suppressed Garnet Electrolytes for Durable Solid\u2010State Batteries"],"prefix":"10.1002","volume":"13","author":[{"given":"Seokjae","family":"Hong","sequence":"first","affiliation":[{"name":"Neutron Science Division Korea Atomic Energy Research Institute (KAERI)  Yuseong\u2010gu Daejeon Republic of Korea"},{"name":"Department of Chemical and Biological Engineering Korea University  Seongbuk\u2010gu Seoul Republic of Korea"},{"name":"Division of Chemical and 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