XPS study on the STOBA coverage on Li(Ni0.4Co0.2Mn0.4)O2 oxide in pristine electrodes

The additive of self‐terminated oligomers with hyper‐branched architecture (STOBA) in Li(Ni0.4Co0.2Mn0.4)O2 (LNCM) cathodes of lithium ion batteries improves the battery stability and capacity. In this study, the surface chemistry of pristine LNCM electrodes with and without the STOBA additive was a...

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Bibliographic Details
Published inSurface and interface analysis Vol. 49; no. 10; pp. 1017 - 1022
Main Authors Chang, Li‐Shin, Wu, Hung‐Chun, Lin, Yi‐Chun, Su, Ching‐Yi, Pan, Jing‐Pin
Format Journal Article
LanguageEnglish
Published Bognor Regis Wiley Subscription Services, Inc 01.10.2017
Subjects
cathode
Cathodes
Chemical bonds
Electrodes
Li(Ni0.4Co0.2Mn0.4)O2
Lithium
Lithium-ion batteries
Nitrogen atoms
Oligomers
Particle physics
STOBA
Vinylidene fluoride
X ray photoelectron spectroscopy
XPS
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Summary:The additive of self‐terminated oligomers with hyper‐branched architecture (STOBA) in Li(Ni0.4Co0.2Mn0.4)O2 (LNCM) cathodes of lithium ion batteries improves the battery stability and capacity. In this study, the surface chemistry of pristine LNCM electrodes with and without the STOBA additive was analyzed by means of X‐ray photoelectron spectroscopy and the surface morphology was observed by scanning electron microscopy. It was found that STOBA covers LNCM particles uniformly and the formation of chemical bonding between nitrogen atoms in STOBA and metallic atoms in LNCM was discovered. This bonding may cause the uniform coverage of STOBA on LNCM. The formation of STOBA layer on LNCM improves the coverage of the binder poly(vinylidene fluoride) and inhibits the formation of LiF.
ISSN:0142-2421
1096-9918
DOI:10.1002/sia.6267