Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 40, Issue 8, Pages 3065-3071Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.02.054
Keywords
Li7La3Zr2O12 (LLZO); Li+ conductivity; Crystal structure; Li site
Categories
Funding
- National Key Research and Development Program of China [2018YFB0905600, 2017YFB0310400]
- National Natural Science Foundation of China [51972246]
- Fundamental Research Funds for the Central Universities in China
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology)
- '111' project [B13035]
- Science and Technology Project of Global Energy Interconnection Research Institute Co., Ltd. [SGGR0000WLJS1801080]
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Doping some elements on Li site of LLZO is an effective method to stabilize it as cubic phase and improve Li+ conductivity. The reported possible Li site elements calculated by first principle are Be, B, Al, Fe, Zn, Ga and the Ga-doped LLZO shows the a higher conductivity than other LLZO. However, whether these elements all can stable LLZO as cubic phase are needed to be verified and the reason of Ga exhibits higher conductivity is not clear enough. In this work, all these elements are tried to be doped on Li site and the results show that the Al, or Fe, or Ga can stable LLZO as cubic phase while the others does not. The Ga-doped LLZO exhibits the highest conductivity of 1.31 x 10(-3) S.cm(-1) due to the transform of group space from Ia-3d to I-43d, shorter distances between different Li+, and Ga can improve the grain size.
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