Subject Index for Volume 38

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• 关键词：Asymmetric electrochemical capacitor ; Lithium transition metal oxide ; Pore size distribution ; Leakage current ; Voltage maintenance
• 刊名：Pediatric Neurology
• 出版年：2008
• 期刊代码：218_08878994
• 类别：med
• 出版时间：June 2008
• 卷：38
• 期：6
• 页码：e3-e5
• 文件大小：36 K

摘要

Layered Li[Ni_1/3Co_1/3Mn_1/3]O₂ cathode materials were synthesized by different synthesis routes using carbonate and hydroxide co-precipitation methods. Physical properties of the prepared Li[Ni_1/3Co_1/3Mn_1/3]O₂ varied depending on the synthesis method employed. These materials were applied as a positive electrode to an asymmetric electrochemical capacitor with activated carbon as the negative electrode and the electrochemical properties of the capacitor were studied. Li[Ni_1/3Co_1/3Mn_1/3]O₂ prepared by the carbonate co-precipitation exhibited higher capacitance and better rate capability with stable cycling retention over 500 cycles than Li[Ni_1/3Co_1/3Mn_1/3]O₂ prepared by the hydroxide co-precipitation. The asymmetric electrochemical capacitor (AEC) cell (AC/Li[Ni_1/3Co_1/3Mn_1/3]O₂) had a voltage slope from 0.2 to 2.2 V and delivered a capacity of 60 F g⁻¹ with a capacity retention of 88.4%during 500 cycles based on the overall active materials weight. The leakage current was largely decreased for the asymmetric electrochemical capacitor and the maintained voltage was 84.4%during 3 days.