Preparation and characterization of LiNi_0.5Mn_1.5O_4?¦Ä thin films taking advantage of correlations with powder samples behavior

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• 作者：Liping Wang^a ; ^b ; ^d ; Hong Li^a ; Matthieu Courty^b ; ^d ; Xuejie Huang^a ; Emmanuel Baudrin^c ; ^d ; ^{emmanuel.baudrin@u-picardie.fr}
• 关键词：High voltage cathode ; Spinel ; Thin films ; Pulsed laser deposition ; Oxygen defect
• 刊名：Journal of Power Sources
• 出版年：2013
• 出版时间：15 June, 2013
• 年：2013
• 卷：232
• 期：Complete
• 页码：165-172
• 全文大小：1666 K

文摘

The high voltage spinel LiNi_0.5Mn_1.5O_4?¦Ä films were obtained by pulsed laser deposition. The effects of oxygen deficiency, annealing treatment, and film thickness on microstructure, morphology and electrochemical properties were investigated. We showed that tuning the oxygen pressure and annealing treatment allows modifying the oxygen film stoichiometry. Trying to determine the oxygen stoichiometry in thin films, a series of oxygen-deficient spinel ¡°LiNi_0.5Mn_1.5O_4?¦Ä¡± powder samples by quench steps from different temperatures were prepared. It is demonstrated that powders and thin films presenting similar cell parameters, namely related to the oxygen stoichiometry, show similar electrochemical profiles. Meanwhile, the compatibility of electrolyte with substrate and the stability of the target were also investigated.