{"title":"Electron transfer in LiMn1.5Ni0.5O4 during charging studied with soft X-ray spectrometry","authors":"Ryosuke Okamoto;Masami Terauchi","doi":"10.1093/jmicro/dfab014","DOIUrl":null,"url":null,"abstract":"This is the first report on analyzing the chemical state of Li-ion battery electrodes at different states of charge by using a wavelength-dispersive spectrometer, which has a two-order improved energy resolution in the soft X-ray energy region compared with that of a conventional energy-dispersive X-ray analyzer. Electrodes containing LiMn\n<inf>1.5</inf>\nNi\n<inf>0.5</inf>\nO\n<inf>4</inf>\n were charged to prepare Li\n<inf>0.5</inf>\nMn\n<inf>1.5</inf>\nNi\n<inf>0.5</inf>\nO\n<inf>4</inf>\n and λ-Mn\n<inf>0.75</inf>\nNi\n<inf>0.25</inf>\nO\n<inf>2</inf>\n. The soft X-ray emission spectra obtained from those materials show that the O-K emission signal was drastically decreased throughout the charging process. This suggests that O-2p electron contributed to the electrochemical oxidation. The density of states and Bader charge evaluated from ab initio calculation support this result.","PeriodicalId":18515,"journal":{"name":"Microscopy","volume":"70 5","pages":"450-460"},"PeriodicalIF":1.8000,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/jmicro/dfab014","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microscopy","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/9623676/","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
This is the first report on analyzing the chemical state of Li-ion battery electrodes at different states of charge by using a wavelength-dispersive spectrometer, which has a two-order improved energy resolution in the soft X-ray energy region compared with that of a conventional energy-dispersive X-ray analyzer. Electrodes containing LiMn
1.5
Ni
0.5
O
4
were charged to prepare Li
0.5
Mn
1.5
Ni
0.5
O
4
and λ-Mn
0.75
Ni
0.25
O
2
. The soft X-ray emission spectra obtained from those materials show that the O-K emission signal was drastically decreased throughout the charging process. This suggests that O-2p electron contributed to the electrochemical oxidation. The density of states and Bader charge evaluated from ab initio calculation support this result.
期刊介绍:
Microscopy, previously Journal of Electron Microscopy, promotes research combined with any type of microscopy techniques, applied in life and material sciences. Microscopy is the official journal of the Japanese Society of Microscopy.