Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 39, Issue 11, Pages 3332-3337Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.04.045
Keywords
Microstructure engineering; Ordered structure; Grain boundary conductivity; Solid state battery
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Funding
- National Natural Science Foundation of China [51571182, 51001091]
- Fundamental Research Program from the Ministry of Science and Technology of China [2014CB931704]
- Program for Science & Technology Innovation Talents in the universities of Henan Province [18HASTIT009]
- Henan province [2017GGJS001, 182102310815]
- International Joint Program of Henan [172102410023]
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In this study, Li0.35La0.55TiO3 (LLTO) was coupled with Al-doped lithium lanthanum zirconate (LLZO) to improve the grain boundary and total conductivity. The obtained ceramic pellets (LLTZO) demonstrated a recordable grain boundary and total conductivity of 3.41 x 10(-4) and 3.03 x 10(-4) S/cm, respectively. The obtained results establish that the heteroatoms can perturb the cation ordered structure and improve the 3D conductivity in grain bulk. In addition, the residual Al-doped LLZO on the grain boundary led to a decline in the boundary resistance. An LiFeCoPO4 vertical bar Li cell was adopted to demonstrate the enhanced conductivity of LLTO. The solid state battery rendered a specific capacity of over 101.2 mAhg(-1) after 300 cycles at a relatively high rate of 0.5C. It is established from the experiments that manufacturing a solid battery using the all-coating technique provides a promising approach to achieve a practical application.
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