https://scholars.lib.ntu.edu.tw/handle/123456789/63890
Title: | 鋰離子二次電池鋰錳氧化物陰極材料之結構安定性與乳膠法製備及特性分析 | Other Titles: | Structural Stability, Emulsion Synthesis, and Characterization of Lithium Manganese Oxide Submicron Powder for the Cathode Materials in Lithium-ion Secondary Batteries | Authors: | 呂宗昕 | Keywords: | 鋰離子二次電池;粉體;乳膠;陰極材料;Lithium ion Battery;Powder;Emulsion;Cathode Material | Issue Date: | 1999 | Publisher: | 臺北市:國立臺灣大學化學工程學系暨研究所 | Abstract: | 本研究以新型乳膠法製程,製備陰極材料 鋰錳氧化物並進行特性分析。在陽離子濃度為 1M 時,以磁石進行攪拌下,可以於低溫300 o C 下得到結晶性的鋰錳氧化物粉體,若進一步高 溫煆燒後可得到單相且結晶性良好的Fd3m 結 構之LiMn2 O4 ,其晶體構造符合結構模擬計算的 結果。而當陽離子濃度提升時,使用磁石攪拌 會在高溫煆燒下出現Mn2 O3 ,若改以均質攪拌機 做處理,則可以得到安定的乳液並在高溫煆燒 獲得單相粉體。使用均質攪拌機可得到在結晶 性以及粉體型態上均優於磁石攪拌製備的粉 體。乳膠粉體具有高反應活性,故LiMn2 O4 合成 溫度較固相法大為下降,且製得次微米的粉 體。將乳膠法佐以均質攪拌機處理所製得的粉 體經800 o C 煆燒一小時後,製成極片進行電池 測試,其初始電容值為120.4mAh/g,經過15 次 循環後為106.3mAh/g ,並擁有良好的循環特性與電容表現。 Lithium manganese oxide as the cathode material used in lithium ion-batteries was prepared by a novel emulsion process. By using a magnetic mixer, the single phase of LiMn2 O4 with high crystallinity was obtained at 800 o C. This powder exhibits a Fd3m structure which is consistent with that simulated by a computer program. With increasing the cation concentration, pure LiMn2 O4 could not be obtained, and an impure phase Mn2 O3 existed in speciemens. To overcome this cumbersome problem, a homogenilizer was used. A well-mixed solution was prepared and pure LiMn2 O4 was synthesized. LiMn2 O4 powder prepared by a homognilizer has a higher crystallinity and a smaller particle size than that prepared by a magnetic stirrer. The prepared LiMn2 O4 powder has a high discharge capacity (120.4mAh/g) at the first run, and this powder also exhibits good cyclability. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/9202 | Other Identifiers: | 882218E002026 | Rights: | 國立臺灣大學化學工程學系暨研究所 |
Appears in Collections: | 化學工程學系 |
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882218E002026.pdf | 612.74 kB | Adobe PDF | View/Open |
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