文章信息/Info

Title:

The Influence of LiNi0.8Co0.2O2 Synthetic Conditions on
 Its Electrochemical Performance

作者:

 劉 伶; 魏奇業

 (吉林化工學院石油化工學院，吉林 吉林 132022)

Author(s):

 LIU Ling; WEI Qiye

 (Institute of Petrochemical Technology, Jilin Institute of Chemical Technology, Jilin 132022, China)

關鍵詞:

LiNi0.8Co0.2O2; 共沉淀; 正極材料; 鋰離子電池

DOI:

10.7502/j.issn.1674-3962.2016.09.11

文獻標志碼:

A

摘要:

采用液相共沉淀法合成前驅體Ni0.8Co0.2(OH)2，再通過高溫焙燒合成LiNi0.8Co0.2O2。研究了前驅體反應時間、反應溫度、高溫焙燒溫度及焙燒時間對材料電化學性能的影響。對所制備材料進行恒流充放電測試，結果表明，在55℃下，共沉淀反應時間為3h時，制備的材料具有較好的電化學性能，其首次放電比容量為164.5mAh?g-1 ，50次容量保持率為92.6%。不同焙燒溫度和焙燒時間制備材料的電化學性能的測試結果表明，隨著焙燒溫度的升高和焙燒時間的增加，產物的電化學性能逐漸提高。焙燒溫度為800℃ ，焙燒時間為 20h得到材料的電化學性能最優，其首次放電比容量為162 mAh?g-1。因此，所制備的LiNi0.8Co0.2O2最佳合成工藝條件為：共沉淀反應溫度55℃，反應時間3h，焙燒溫度為800℃，焙燒時間為20h。

Abstract:

LiNi0.8Co0.2O2 powder was prepared by co-precipitation method and solid state reaction method，the precursor prepared by the co-prcipitation was Ni0.8Co0.2(OH)2. The effects of the synthesis temperature, synthesis time, the high temperature calcination temperature and the calcination time on the electrochemical properties of the cathode material were investigated in detail. The electrochemical properties of the prepared LiNi0.8Co0.2O2 were characterized by galvanostatic charge–discharge test. The results indicated that the LiNi0.8Co0.2O2 prepared at 55℃ for 3h had the best electrochemical performance, its first discharge capacity was 164.5mAh?g-1 and capacity retention after 50 cycles was 92.6% . The calcination temperatures and calcination times caused great difference in the electrchemical properties of  LiNi0.8Co0.2O2, its electrochemical properties increased with the increase of calcination temperature and calcination time. The best electrochemical properties were obtained at the calcination temperature of 800℃ for 20h, its first discharge capacity was 162 mAh?g-1 . Therefore, the optimum synthetic conditions were: synthesis temperature was 55℃, synthesis time was 6h, calcination temperature was 800℃ and calcination time was 20h.