| Autor: |
Takashi Iwatani, Hideki Maekawa, Junichi Kawamura, Hangyan Shen, Tsutomu Yamamura |
| Rok vydání: |
2008 |
| Předmět: |
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| Zdroj: |
Solid State Ionics. 178:1637-1641 |
| ISSN: |
0167-2738 |
| DOI: |
10.1016/j.ssi.2007.10.018 |
| Popis: |
The enhancement of lithium ion conductivity was observed for the composite type electrolyte based on Li 2 ZnI 4 and sol–gel synthesized mesoporous-Al 2 O 3 with controlled pore size (2–10 nm). Compositional and pore size dependence of the electrical conductivity was investigated. More than fifty times enhancement of the electrical conductivity was observed for the composite with mesopore size greater than 5.0 nm. 6 Li MAS-NMR measurement was performed for the composite electrolytes based on LiI and Li 2 ZnI 4 . Both LiI and Li 2 ZnI 4 gave an identical 6 Li NMR peak position at − 4.9 ppm. Two additional lithium ion environments, at − 0.8 ppm and − 2.8 ppm, respectively, were observed for the composite. Comparison with a 6 Li cross polarization MAS-NMR measurement clarified the origin of − 0.8 ppm peak as a surface lithium ion adjacent to OH − groups. The high conductivity of the composite was suggested to originate from new interfacial phase that have 6 Li NMR peak position at − 2.8 ppm. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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