Electrochemical stability of Li6.5La3Zr2M0.5O12 (M = Nb or Ta) against metallic lithium
The electrochemical stability of Li6.5La3Zr1.5Nb0.5O12 (LLZNO) and Li6.5La3Zr1.5Ta0.5O12 (LLZTO) against metallic Li was studied using direct current (DC) and electrochemical impedance spectroscopy (EIS). Dense polycrystalline LLZNO (ρ=97 %) and LLZTO (ρ=92 %) were made using sol-gel synthesis and...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2016-05-01
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| Series: | Frontiers in Energy Research |
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| Online Access: | http://journal.frontiersin.org/Journal/10.3389/fenrg.2016.00020/full |
| _version_ | 1818063423712264192 |
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| author | Yunsung eKim Aeri eYoo Robert eSchmidt Asma eSharafi Heechul eLee Jeff eWolfenstine Jeff eSakamoto |
| author_facet | Yunsung eKim Aeri eYoo Robert eSchmidt Asma eSharafi Heechul eLee Jeff eWolfenstine Jeff eSakamoto |
| author_sort | Yunsung eKim |
| collection | DOAJ |
| description | The electrochemical stability of Li6.5La3Zr1.5Nb0.5O12 (LLZNO) and Li6.5La3Zr1.5Ta0.5O12 (LLZTO) against metallic Li was studied using direct current (DC) and electrochemical impedance spectroscopy (EIS). Dense polycrystalline LLZNO (ρ=97 %) and LLZTO (ρ=92 %) were made using sol-gel synthesis and rapid induction hot-pressing at 1100 °C and 15.8 MPa. During DC cycling tests at room temperature (±0.01 mA/cm2 for 36 cycles), LLZNO exhibited an increase in Li-LLZNO interface resistance and eventually short-circuiting while the LLZTO was stable. After DC cycling, LLZNO appeared severely discolored while the LLZTO did not change in appearance. We believe the increase in Li-LLZNO interfacial resistance and discoloration are due to reduction of Nb5+ to Nb4+. The negligible change in interfacial resistance and no color change in LLZTO suggest that Ta5+ may be more stable against reduction than Nb5+ in cubic garnet versus Li during cycling. |
| first_indexed | 2024-12-10T14:19:52Z |
| format | Article |
| id | doaj.art-28d425c19f524ed4b82007a5502ae3d9 |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-12-10T14:19:52Z |
| publishDate | 2016-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj.art-28d425c19f524ed4b82007a5502ae3d92022-12-22T01:45:13ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2016-05-01410.3389/fenrg.2016.00020195037Electrochemical stability of Li6.5La3Zr2M0.5O12 (M = Nb or Ta) against metallic lithiumYunsung eKim0Aeri eYoo1Robert eSchmidt2Asma eSharafi3Heechul eLee4Jeff eWolfenstine5Jeff eSakamoto6University of MichiganKorea Polytechnic UniversityUniversity of MichiganUniversity of MichiganKorea Polytechnic UniversityArmy research LaboratoryUniversity of MichiganThe electrochemical stability of Li6.5La3Zr1.5Nb0.5O12 (LLZNO) and Li6.5La3Zr1.5Ta0.5O12 (LLZTO) against metallic Li was studied using direct current (DC) and electrochemical impedance spectroscopy (EIS). Dense polycrystalline LLZNO (ρ=97 %) and LLZTO (ρ=92 %) were made using sol-gel synthesis and rapid induction hot-pressing at 1100 °C and 15.8 MPa. During DC cycling tests at room temperature (±0.01 mA/cm2 for 36 cycles), LLZNO exhibited an increase in Li-LLZNO interface resistance and eventually short-circuiting while the LLZTO was stable. After DC cycling, LLZNO appeared severely discolored while the LLZTO did not change in appearance. We believe the increase in Li-LLZNO interfacial resistance and discoloration are due to reduction of Nb5+ to Nb4+. The negligible change in interfacial resistance and no color change in LLZTO suggest that Ta5+ may be more stable against reduction than Nb5+ in cubic garnet versus Li during cycling.http://journal.frontiersin.org/Journal/10.3389/fenrg.2016.00020/fullElectrochemical stabilityCeramic electrolyteInterfacial resistanceGarnet stabilityLLZO |
| spellingShingle | Yunsung eKim Aeri eYoo Robert eSchmidt Asma eSharafi Heechul eLee Jeff eWolfenstine Jeff eSakamoto Electrochemical stability of Li6.5La3Zr2M0.5O12 (M = Nb or Ta) against metallic lithium Frontiers in Energy Research Electrochemical stability Ceramic electrolyte Interfacial resistance Garnet stability LLZO |
| title | Electrochemical stability of Li6.5La3Zr2M0.5O12 (M = Nb or Ta) against metallic lithium |
| title_full | Electrochemical stability of Li6.5La3Zr2M0.5O12 (M = Nb or Ta) against metallic lithium |
| title_fullStr | Electrochemical stability of Li6.5La3Zr2M0.5O12 (M = Nb or Ta) against metallic lithium |
| title_full_unstemmed | Electrochemical stability of Li6.5La3Zr2M0.5O12 (M = Nb or Ta) against metallic lithium |
| title_short | Electrochemical stability of Li6.5La3Zr2M0.5O12 (M = Nb or Ta) against metallic lithium |
| title_sort | electrochemical stability of li6 5la3zr2m0 5o12 m nb or ta against metallic lithium |
| topic | Electrochemical stability Ceramic electrolyte Interfacial resistance Garnet stability LLZO |
| url | http://journal.frontiersin.org/Journal/10.3389/fenrg.2016.00020/full |
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