Consolidating the grain boundary of garnet electrolyte LLZTO with Li3BO3 for high performance LiNi0. 8Co0. 1Mn0. 1O2/LiFePO4 hybrid solid batteries

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dc.contributor.authorXie, Hen_AU
dc.contributor.authorLi, Cen_AU
dc.contributor.authorKan, WHen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorZhu, Cen_AU
dc.contributor.authorZhao, Zen_AU
dc.contributor.authorChu, Xen_AU
dc.contributor.authorMu, Den_AU
dc.contributor.authorWu, Fen_AU
dc.date.accessioned2021-03-18T21:04:11Zen_AU
dc.date.available2021-03-18T21:04:11Zen_AU
dc.date.issued2019-07-10en_AU
dc.date.statistics2021-03-18en_AU
dc.description.abstractAll solid-state batteries have received significant attention due to their excellent safety performance. As a key component, the garnet-type electrolyte is one of the best known electrolytes due to its air stability and good compatibility with metallic lithium. However, the total Li+ conductivity of this kind of electrolyte is usually lower than that of the bulk electrolyte primarily due to the grain boundary resistance. In this study, we focused on engineering the electrolyte Li6.4La3Zr1.4Ta0.6O12 (LLZTO) by introducing Li3BO3 (LBO) into it to form the electrolyte LLZTO/LBO with the aim to consolidate the grain boundary. Via characterization by both neutron and X-ray diffraction, the as-prepared LLZTO was indexed as a pure cubic phase, where Ta certainly substituted the Zr sites. LLZTO/LBO still maintained the cubic structure, and the B atoms did not occupy any cation sites in the unit cell. It was demonstrated that an amorphous phase of a boracic substance was trapped inside the cubic LLZTO phase. The amorphous boracic phase sutured the gaps among the LLZTO grains and then lowered the grain boundary resistance without introducing impurities, ultimately consolidating the solid-state electrolyte. Electrochemical impedance spectroscopy revealed that the total Li+ conductivity of LLZTO/LBO reached 5.47 × 10−4 S cm−1, much higher than those of the as-prepared Li7La3Zr2O12 (LLZO) and LLZTO. Using LLZTO/LBO as an electrolyte, the LiNi0.8Co0.1Mn0.1O2/LiFePO4 hybrid solid battery showed an excellent cycling performance with the reversible capacity of 147.8 mA h g−1 at 0.2C for 100 cycles and the capacity retention of 93.8%. These results suggest that the consolidation of the grain boundary with LBO is a promising way to achieve an improved electrolyte, LLZO, with higher total Li+ conductivity. © Royal Society of Chemistry 2019en_AU
dc.identifier.citationXie, H., Li, C., Kan, W. H., Avdeev, M., Zhu, C., Zhao, Z., Chu, X., Mu, D., & Wu, F. (2019). Consolidating the grain boundary of garnet electrolyte LLZTO with Li3BO3 for high performance LiNi0. 8Co0. 1Mn0. 1O2/LiFePO4 hybrid solid batteries. Journal of Materials Chemistry A, 7(36), 20633-20639. doi:10.1039/C9TA03263Ken_AU
dc.identifier.issn2050-7496en_AU
dc.identifier.issue36en_AU
dc.identifier.journaltitleJournal of Materials Chemistry Aen_AU
dc.identifier.pagination20633-20639en_AU
dc.identifier.urihttps://doi.org/10.1039/C9TA03263Ken_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10571en_AU
dc.identifier.volume7en_AU
dc.language.isoenen_AU
dc.publisherRoyal Society of Chemistryen_AU
dc.subjectGrain boundariesen_AU
dc.subjectElectrolytesen_AU
dc.subjectElectric batteriesen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectLithiumen_AU
dc.subjectX-ray diffractionen_AU
dc.titleConsolidating the grain boundary of garnet electrolyte LLZTO with Li3BO3 for high performance LiNi0. 8Co0. 1Mn0. 1O2/LiFePO4 hybrid solid batteriesen_AU
dc.typeJournal Articleen_AU
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