A novel low-temperature solid-state route for nanostructured cubic garnet Li 7 La 3 Zr 2 O 12 and its application to Li-ion battery

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dc.identifier.uri http://dx.doi.org/10.15488/795
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/819
dc.contributor.author Kumar, P. Jeevan
dc.contributor.author Nishimura, K.
dc.contributor.author Senna, M.
dc.contributor.author Düvel, A.
dc.contributor.author Heitjans, Paul
dc.contributor.author Kawaguchi, T.
dc.contributor.author Sakamoto, N.
dc.contributor.author Wakiya, N.
dc.contributor.author Suzuki, H.
dc.date.accessioned 2016-12-06T07:33:01Z
dc.date.available 2016-12-06T07:33:01Z
dc.date.issued 2016
dc.identifier.citation Kumar, P. Jeevan; Nishimura, K.; Senna, M.; Düvel, A.; Heitjans, P. et al.: A novel low-temperature solid-state route for nanostructured cubic garnet Li 7 La 3 Zr 2 O 12 and its application to Li-ion battery. In: RSC Advances 6 (2016), Nr. 67, S. 62656-62667. DOI: http://dx.doi.org/10.1039/C6RA09695F
dc.description.abstract We present a novel approach to the solid-state synthesis of garnet-type cubic Li7La3Zr2O12 (c-LLZO) nanostructured particles with 1.0 mass% Al at 750 °C within 3 h. In contrast to conventional solid-state processes, a highly reactive precursor was prepared in two steps: (i) by homogenizing the stoichiometric mixture without Li, and (ii) subsequent addition of Li in the form of an ethanolic solution of lithium acetate. The actual composition determined by ICP analysis was Li6.61La3Zr2Al0.13O11.98. Sintering these nanoparticles at 1100 °C for 3 h in air after cold isostatic pressing brought a dense ceramic pellet with a relative density of 90.5%. The corresponding ionic conductivity with Au electrodes was 1.6 × 10−4 S cm−1 at room temperature. To study its electrochemical behavior as an electrolyte, a model cell of Li//(1 M LiPF6 + c-LLZO)//LiCoO2 configuration was constructed. Cyclic voltammetry of the cell delivered one set of redox couple with narrow voltage separation (15 mV) with a Li+ diffusion coefficient at room temperature of about 2 × 10−11 cm2 s−1 at the interface between LiCoO2 and 1 M LiPF6 + c-LLZO. The cell received an average discharge capacity of 64.4, 60.3, 56.1, 51.9 and 46.9 μA h cm−2 μm−1 at discharge rates 0.5C, 1C, 2C, 4C and 6C, respectively. The cell exhibited complete oxidation and reduction reactions with an average initial discharge capacity of about 64 μA h cm−2 μm−1, which is 92.7% of LiCoO2 theoretical value. These observations indicate the applicability of the present c-LLZO as an electrolyte for a solid-state Li-ion battery. eng
dc.description.sponsorship Japan Science and Technology Agency
dc.description.sponsorship DFG/molife
dc.description.sponsorship Ministry for Science and Culture (MWK) of the Federal State of Lower Saxony, Germany
dc.language.iso eng
dc.publisher Cambridge : Royal Society of Chemistry
dc.relation.ispartofseries RSC Advances 6 (2016), Nr. 67
dc.rights CC BY 3.0
dc.rights.uri https://creativecommons.org/licenses/by/3.0/
dc.subject c-LLZO eng
dc.subject Li-ion battery eng
dc.subject electrochemistry eng
dc.subject nanomaterials eng
dc.subject.ddc 540 | Chemie ger
dc.title A novel low-temperature solid-state route for nanostructured cubic garnet Li 7 La 3 Zr 2 O 12 and its application to Li-ion battery
dc.type article
dc.type Text
dc.relation.essn 2046-2069
dc.relation.doi http://dx.doi.org/10.1039/C6RA09695F
dc.bibliographicCitation.issue 67
dc.bibliographicCitation.volume 6
dc.bibliographicCitation.firstPage 62656
dc.bibliographicCitation.lastPage 62667
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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