Transport Mechanism of Li-ions in Nano-Sized TiO2 Modified Solid Polymer Electrolytes Investigated by Solid State NMR
碩士 === 國立臺灣科技大學 === 化學工程系 === 92 === The main objective of the present investigation is to explore the transport mechanism of Li-ion in solid polymer electrolytes modified by TiO2 nanoparticles by using Solid-State NMR and to understand the reason of enhanced conductivity in solid polymer electrolyt...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2004
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| Online Access: | http://ndltd.ncl.edu.tw/handle/61144921097066476585 |
| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 92 === The main objective of the present investigation is to explore the transport mechanism of Li-ion in solid polymer electrolytes modified by TiO2 nanoparticles by using Solid-State NMR and to understand the reason of enhanced conductivity in solid polymer electrolytes modified by TiO2 nanoparticles.
The grain size of Hydro-TiO2 prepared by hydrothermal method is about 5.2 nm and the dispersion is better than that of HMDS-TiO2. The decomposition potential of Hydro-CPE-10%LiClO4-5%TiO2 synthesized in aqueous system and HMDS-CPE-10%LiClO4-5%TiO2 synthesized in non-aqueous system is same in both the compounds and have the value about 5.2 V, and resistance of the passivation film is also almost the same in both the compounds. The Li-ion environment in Hydro-CPE-10%LiClO4-5%TiO2 was analyzed via using Solid-State NMR and combined with conductivity at various temperatures. We have observed that the TiO2 nanoparticles can provide a new pathway for Li-ion transport in the electrolyte and help to dissociate the ion-pairs of the electrolyte.
Solid-State NMR results envisaged that the TiO2 nanoparticles will help to dissociate more ion-pairs for Li-salts of weakly coordinating anions. Thorough understanding of the solid-state NMR results of the present investigation allowed us to improve the Li-ion conductivity further in TiO2 nanoparticles modified solid state polymer electrolyte. We have achieved a higher conductivity of 9.5×10-5S/cm for Hydro-CPE-18.5%LiBOB-5%TiO2 and 1.58×10-5S/cm for Hydro-CPE-10%LiClO4-5%TiO2 at 30oC.
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