4.4 Article

Anisotropy in lithium ion conduction in laminated thin films of montmorillonite nanosheets

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IOP PUBLISHING LTD
DOI: 10.1088/0268-1242/29/6/064011

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laminated thin film; nanosheet; anisotropy; ionic conduction; montmorillonite

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Laminated thin films of lithium-ion-exchanged montmorillonite nanosheets were prepared, and their anisotropy in lithium ion conduction was investigated. For the films with 0.70 mu m thickness, the lithium ion conductivities at 30 degrees C in the directions parallel and perpendicular to the film plane (sigma(//), sigma(perpendicular to)) were determined by alternative current impedance measurements and found to be 4.3 x 10(-2) and 5.7 x 10(-6) S cm(-1), respectively. The dependence of sigma(perpendicular to) on the nanosheet size for the films composed of nanosheets with different lateral sizes was also investigated. sigma(perpendicular to) decreased as the lateral size of the nanosheets increased. A model for the lithium ion conduction path in the nanosheet-laminated films is proposed, and the dependence of conduction on the nanosheet size is discussed.

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