Improving the Li-ion conductivity and air stability of cubic Li7La3Zr2O12 by the co-doping of Nb,Y on the Zr site |
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| Authors: | Jianli Gai Erqing Zhao Furui Ma Deye Sun Xiaodi Ma Yongcheng Jin Qingliu Wu Yongjie Cui |
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| Affiliation: | 1. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese of Academy of Sciences, 189 Songling Road, Qindao, 266101, China;2. School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Eastern Hualan Avenue, Xinxiang 453003, China;3. Department of Chemical and Paper Engineering, Western Michigan University, 1903 W. Michigan Ave., Kalamazoo, MI, USA;4. College of Mechanical and Electronic Engineering, Northwest A&F University, 22 Xinong Road, Yangling 712100, Shaanxi, China |
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| Abstract: | The elements Nb and Y were simultaneously substituted to the Zr sites of an Li7La3Zr2O12 (LLZO) electrolyte to improve its Li-ion conductivity and air stability. Samples of Li7La3Zr2-2xNbxYxO12 were fabricated using a solid-state reaction method. The results show that the introduction of Nb and Y can stabilise cubic-phase LLZO. The total conductivity of Li7La3ZrNb0.5Y0.5O12 electrolyte can reach 8.29 × 10?4 S cm?1 at 30 °C when sintered at 1230 °C for only 15 h. Surprisingly, the conductivity of Li7La3ZrNb0.5Y0.5O12 can be maintained at 6.91 × 10?4 S cm?1 after exposure to air for 1.5 months, indicating excellent air stability. Furthermore, a LiFePO4/Li7La3ZrNb0.5Y0.5O12/Li cell displayed stable charge/discharge and cycling performance at ambient temperature, suggesting there is potential to use Li7La3ZrNb0.5Y0.5O12 electrolyte in Li-ion batteries. Additionally, the effects of varying the co-doping amount and dwelling time on the Li-ion conductivity of Li7La3Zr2-2xNbxYxO12 were investigated. |
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| Keywords: | Solid state electrolyte Ionic conductivity Garnet Lithium ion battery |
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