Synthesis of Garnet LLZO by Aliovalent Co-Doping, and Electrochemical Behavior of Composite Solid Electrolyte for All-Solid Lithium Batteries
| Autor: | Min-Young Kim, Byeong-Su Kang, Young-Woong Song, Sang-Jun Park, Jinsub Lim, Hyungchan Kim, YoungSun Hong, Ho-Sung Kim, Jong-Hun Han |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of The Electrochemical Society. 169:120506 |
| ISSN: | 1945-7111 0013-4651 |
| Popis: | Garnet-like Ga-M (M = Ta, Rb, Y) co-doped Li7La3Zr2O12 powders are prepared by the Taylor reaction, including Ga-LLZO, Ga-Ta LLZO, Ga-Rb LLZO, and Ga-Y LLZO. The lattice constant (12.97 Å) and large crystallite size (866 Å) of Ga-Rb LLZO powder enabled the highest ionic conductivity (2.03 × 10–3 S cm−1 at 25 °C) in the pellet form. Moreover, Ga-Rb LLZO powders are calcined in various temperature range and are utilized in composite solid electrolyte sheets consisting of Ga-Rb LLZO, polyethylene oxide, and salts. The ionic conductivity of the CSE sheets is increased in proportion to the calcination temperature in the range of 2.43 × 10−4 to 8.60 × 10−4 S cm−1 at 70 °C. The LLZO particle-size and crystallite-size requirements are differ for the cathode and CSE sheet. Three types of all-solid-state lithium batteries are designed, among which all-solid lithium batteries-3 employing Ga-Rb LLZO powder calcined at 900 °C and 1100 °C for the cathode and CSE sheet, respectively, exhibits an initial capacity of ∼139 mAh g−1 at 0.1C and 70 °C, with a capacity retention of ∼92% after 100 cycles. In particular, in terms of rate characteristics, 1C compared to 0.1C capacity shows excellent value, maintaining about 85%. |
| Databáze: | OpenAIRE |
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