Di Zhao1, Yiwen Yang1, Chenglin Zhang2,*, Genxiang Zhu3,*
1Institute of Advanced Technology, University of Science and Technology of China, Hefei, Anhui, China.
2Anhui Top Additive Manufacturing Technology Co., LTD, Fanchang, Wuhu, Anhui, China.
3Hefei Kejing Material Technology Co., LTD, Hefei, Anhui, China.
*Corresponding author: Chenglin Zhang, Genxiang Zhu
Abstract
Li7La3Zr2O12 (LLZO) solid electrolyte with garnet structure is expected to become an important development direction of lithium-ion batteries in the future due to its large electrochemical window, good heat resistance and high safety. Since the lithium ions in c-LLZO are easier to diffuse than those in t-LLZO, the ionic conductivity of c-LLZO is two orders of magnitude higher than that of t-LLZO. Element doping is an important way to improve its ionic conductivity. Nb doping in LLZO stabilizes the cubic phase structure of LLZO by Zr doping, which will improve the ionic conductivity of LLZO at room temperature. Therefore, in this study, we studied the phase composition, microstructure and room temperature ionic conductivity of LLZO electrolyte doped with different contents of Nb by solid state reaction. Through comparative analysis, the electrolyte prepared by doping Y = 0.4 niobium element content has the best relative density (89.1 %) and room temperature ionic conductivity (2.05×10-4S cm-1).
References
[1] Cao, Shiyu, et al. "Modeling, preparation, and elemental doping of Li7La3 Zr2O12 garnet-type solid electrolytes: A review." Journal of the Korean Ceramic Society, 56.2 (2019): 111-129.
[2] Zhou, Dong, et al. "Polymer electrolytes for lithium-based batteries: advances and prospects." Chem, 5.9 (2019): 2326-2352.
[3] Hu, Yunhuan, et al. "Hybrid Ionogel Electrolytes for Advanced Lithium Secondary Batteries: Developments and Challenges." Chemistry—An Asian Journal, (2022): e202200794.
[4] Zheng, Yun, et al. "A review of composite solid-state electrolytes for lithium batteries: fundamentals, key materials and advanced structures." Chemical Society Reviews, 49.23, (2020): 8790-8839.
[5] Murugan R, Thangadurai V, Weppner W. Fast lithium ion conduction in garnet‐type Li7La3Zr2O12 [J]. Angewandte Chemie International Edition, 2007, 46(41): 7778-7781.
[6] Geiger C A, Alekseev E, Lazic B, et al. Crystal chemistry and stability of “Li7La3Zr2O12” garnet: a fast lithium-ion conductor [J]. Inorganic chemistry, 2011, 50(3): 1089-1097.
[7] Awaka J, Kijima N, Hayakawa H, et al. Synthesis and structure analysis of tetragonal Li7La3Zr2O12 with the garnet-related type structure [J]. Journal of solid state chemistry, 2009, 182(8): 2046-2052.
[8] Zhuang, Libin, et al. "Phase transformation and grain-boundary segregation in Al-Doped Li7La3Zr2O12 ceramics." Ceramics International, 47.16 (2021): 22768-22775.
[9] Guo, Sijie, Yonggang Sun, and Anmin Cao. "Garnet-type solid-state electrolyte Li7La3Zr2O12: crystal structure, element doping and interface strategies for solid-state Lithium batteries." Chemical Research in Chinese Universities, 36.3 (2020): 329-342.
How to cite this paper
Effect of Nb Doping on Phase, Microstructure and Lithium-ion Conductivity of Li7La3Zr2O12 Solid Electrolyte
How to cite this paper: Di Zhao, Yiwen Yang, Chenglin Zhang, Genxiang Zhu. (2023). Effect of Nb Doping on Phase, Microstructure and Lithium-ion Conductivity of Li7La3Zr2O12 Solid Electrolyte. Engineering Advances, 3(2), 84-88.
DOI: http://dx.doi.org/10.26855/ea.2023.04.001