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National Chung Hsing University Institutional Repository - NCHUIR > 工學院 > 材料科學與工程學系 > 依資料類型分類 > 碩博士論文 >  5V 高電位鋰鎳錳氧化物薄膜鋰離子電池正極材料之特性研究

Please use this identifier to cite or link to this item: http://nchuir.lib.nchu.edu.tw/handle/309270000/103223

標題: 5V 高電位鋰鎳錳氧化物薄膜鋰離子電池正極材料之特性研究
Characterization of 5V High Voltage LiNixMn2-xO4 for Cathode Materials in Thin Film Lithium-Ion Batteries
作者: 方康瑋
Fang, Kang-Wei
Contributors: 何文賢;李青霏
顏秀崗
中興大學
關鍵字: 5V high voltage cathode materials;LiNixMn2-XO4;spinel structure;thin film lithium-ion batteries
5V 高電位正極材料;LiNixMn2-XO4;尖晶石結構;薄膜鋰電池
日期: 2012
Issue Date: 2012-09-04 12:02:25 (UTC+8)
Publisher: 材料科學與工程學系所
摘要: 為了滿足未來對高電位大電流電池之需求,本研究成功在不鏽鋼基材上以創新方法合成5V 高電位正極材料LiNixMn2-XO4應用於薄膜鋰電池。經由陰極極化,FE-SEM,XRD,循環伏安,充放電測試,發現此片狀正極材料具尖晶石結構之氧化電位分別為4.02 V,4.7 V和4.78 V (vs. Li/Li+),還原電位分別為4.72 V,4.65 V和4.39 V (vs. Li/Li+)。退火溫度和溶液中錳離子與鎳離子之比例,均會影響LiNixMn2-XO4之純度與結晶性,最後導致其充放電性能之優劣,本研究建議溶液中錳跟鎳的比例為四比一且在退火溫度500◦C時具有較好的性能。在此沉積條件下,LiNixMn2-XO4薄膜半電池在3.4至4.9 V之間以50 μA/cm2電流密度充放電20圈,第一圈放電電容量達120 mAh/g,第二十圈放電電容量達105 mAh/g。
In order to satisfy the need of batteries with the high voltage and the high current, the coating of 5V high voltage LiNixMn2-XO4 on stainless steel has been successfully prepared by a novel method for cathodes in thin film lithium batteries in this study. Through cathodic polarization tests, field emission scanning electron microscopy (FE-SEM), cyclic voltammetry (CV), x-ray diffraction (XRD) analysis and charge/discharge tests, it was found that the oxidation peaks at 4.02, 4.7 and 4.78 V and reduction peaks at 4.72, 4.65 and 3.97 V resulted from the overall cell reaction for the Li extraction/insertion reaction from/in the flake-like LiNixMn2-XO4 with spinel structure. The LiNixMn2-XO4 film deposited in solution with the ion ratio of Mn to Ni 4:1 and annealed at 500◦C, revealed the greater capacity 188 and 120 mAh/g for the first charge and discharge, respectively and 105 for the 20th cycle discharge at 50 μA/cm2 between 3.4 and 4.9 V, compared with other conditions. It was concluded that the capacity was related to the crystallinity and phase purity of LiNixMn2-XO4.
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