Lithium-ion transfer at LiMn2O4 thin film electrode prepared by pulsed laser deposition
書誌事項
- 公開日
- 2003-06
- 権利情報
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- https://www.elsevier.com/tdm/userlicense/1.0/
- https://www.elsevier.com/legal/tdmrep-license
- DOI
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- 10.1016/s1388-2481(03)00113-9
- 公開者
- Elsevier BV
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説明
Abstract LiMn 2 O 4 thin film electrode was prepared by pulsed laser deposition for fabrication of structurally ordered electrode/electrolyte interface. Li-ion transfer at the LiMn 2 O 4 electrode was studied by AC impedance spectroscopy. At potentials below 3.70 V (vs. Li/Li + ), no semi-circle was observed on Nyquist plot. No oxidation and reduction currents were observed in cyclic voltammogram of LiMn 2 O 4 thin film electrode at the potential range of 3.50–3.70 V, showing blocking electrode behaviors. Nyquist plots gave one semi-circle in the higher frequency region and a linear Warburg impedance in the lower frequency region at potential region above 3.80 V. The resistance of semi-circle was dependent on electrode potential and practical electrical resistance of LiMn 2 O 4 along the thickness was negligible because of its small thickness. Hence, the semi-circle was identified as resistance for interfacial lithium-ion transfer. The resistance decreased with increasing electrode potentials up to 4.0 V and then increased with increasing electrode potentials. Temperature dependency of the resistance gave activation energy of 50 ± 2.4 kJ mol −1 , indicating that high activation barrier exists at electrode/electrolyte interface for lithium-ion transfer.
収録刊行物
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- Electrochemistry Communications
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Electrochemistry Communications 5 (6), 502-505, 2003-06
Elsevier BV