{"title":"Origin of O2 Generation in Sulfide-Based All-Solid-State Batteries and its Impact on High Energy Density","authors":"Keisuke Yoshikawa, Takeshi Kato, Yasuhiro Suzuki, Akihiro Shiota, Tsuyoshi Ohnishi, Koji Amezawa, Aiko Nakao, Takeshi Yajima, Yasutoshi Iriyama","doi":"10.1002/advs.202402528","DOIUrl":null,"url":null,"abstract":"<p>The cathode surface of sulfide-based all-solid-state batteries (SBs) is commonly coated with amorphous-LiNbO<sub>3</sub> in order to stabilize charge–discharge reactions. However, high-voltage charging diminishes the advantages, which is caused by problems with the amorphous-LiNbO<sub>3</sub> coating layer. This study has investigated the degradation of amorphous-LiNbO<sub>3</sub> coating layer directly during the high-voltage charging of SBs. O<sub>2</sub> generation via Li extraction from the amorphous-LiNbO<sub>3</sub> coating layer is observed using electrochemical gas analysis and electrochemical X-ray photoelectron spectroscopy. This O<sub>2</sub> leads to the formation of an oxidative solid electrolyte (SE) around the coating layer and degrades the battery performance. On the other hand, elemental substitution (i.e., amorphous-LiNb<i><sub>x</sub></i>P<sub>1-</sub><i><sub>x</sub></i>O<sub>3</sub>) reduces O<sub>2</sub> release, leading to stable high-voltage charge–discharge reactions of SBs. The results have emphasized that the suppression of O<sub>2</sub> generation is a key factor in improving the energy density of SBs.</p>","PeriodicalId":117,"journal":{"name":"Advanced Science","volume":null,"pages":null},"PeriodicalIF":14.3000,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/advs.202402528","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Science","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/advs.202402528","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The cathode surface of sulfide-based all-solid-state batteries (SBs) is commonly coated with amorphous-LiNbO3 in order to stabilize charge–discharge reactions. However, high-voltage charging diminishes the advantages, which is caused by problems with the amorphous-LiNbO3 coating layer. This study has investigated the degradation of amorphous-LiNbO3 coating layer directly during the high-voltage charging of SBs. O2 generation via Li extraction from the amorphous-LiNbO3 coating layer is observed using electrochemical gas analysis and electrochemical X-ray photoelectron spectroscopy. This O2 leads to the formation of an oxidative solid electrolyte (SE) around the coating layer and degrades the battery performance. On the other hand, elemental substitution (i.e., amorphous-LiNbxP1-xO3) reduces O2 release, leading to stable high-voltage charge–discharge reactions of SBs. The results have emphasized that the suppression of O2 generation is a key factor in improving the energy density of SBs.
期刊介绍:
Advanced Science is a prestigious open access journal that focuses on interdisciplinary research in materials science, physics, chemistry, medical and life sciences, and engineering. The journal aims to promote cutting-edge research by employing a rigorous and impartial review process. It is committed to presenting research articles with the highest quality production standards, ensuring maximum accessibility of top scientific findings. With its vibrant and innovative publication platform, Advanced Science seeks to revolutionize the dissemination and organization of scientific knowledge.