加压氧化法制备LiNi0.8Co0.15Al0.05O2正极材料
来源期刊：中国有色金属学报2013年第1期
论文作者：刘万民 胡国荣 彭忠东 杜柯 曹雁冰 刘强 黄金龙
文章页码：133 - 141
关键词：锂离子电池；正极材料；LiNi0.8Co0.15Al0.05O2；加压氧化
Key words：lithium ion battery; cathode material; LiNi0.8Co0.15Al0.05O2; oxidation under elevated pressure
摘 要：以控制结晶法合成的球形Ni0.8Co0.15Al0.05(OH)2.05为前驱体，采用加压氧化法制备锂离子电池正极材料LiNi0.8Co0.15Al0.05O2。利用X射线衍射(XRD)、扫描电镜(SEM)和恒电流充放电测试等方法对该材料的结构、形貌及电化学性能进行表征。考察氢氧化锂与前驱体物质的量之比(锂配比)、在煅烧过程中的压力、温度和时间等因素对LiNi0.8Co0.15Al0.05O2材料结构及性能的影响。结果表明：锂配比为1.02时，在0.4 MPa氧气压力下，于700 ℃煅烧10 h制备的材料具有最完善的结构和最好的电化学性能；在2.8~4.3 V电压范围内，以0.2 C进行充放电，首次放电比容量达到190.1 mA?h/g，50次循环后容量保持率为90.2%，同时显示出良好的倍率性能和高温性能。
Abstract: The cathode materials LiNi0.8Co0.15Al0.05O2 were synthesized under elevated oxygen pressure from spheric Ni0.8Co0.15Al0.05(OH)2.05 prepared by controlled crystallization method. The materials were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and galvanostatic charge-discharge tests. The effects of molar ratio of Li to Ni+Co+Al, oxygen pressure, temperature and time during calcining on the material structure and electrochemical properties of LiNi0.8Co0.15Al0.05O2 were examined. The results show that, under the conditions of the molar ratio of Li to Ni+Co+Al of 1.02, oxygen pressure of 0.4 MPa, temperature of 700 ℃ and time of 10 h, the obtained material exhibits the most ordered structure and the best electrochemical performance. The initial discharge specific capacity of the material is 190.1 mA·h/g at 0.2 C in the voltage range of 2.8?4.3 V, and after 50 cycles, 90.2% of the initial discharge capacity of the material is maintained. Besides, the material also exhibits excellent rate capability and high-temperature performance.
刘万民1, 2，胡国荣1，彭忠东1，杜 柯1，曹雁冰1，刘 强1，黄金龙1
(1. 中南大学 冶金科学与工程学院，长沙 410083；
2. 湖南工程学院 化学化工学院，湘潭 411104)
摘 要：以控制结晶法合成的球形Ni0.8Co0.15Al0.05(OH)2.05为前驱体，采用加压氧化法制备锂离子电池正极材料LiNi0.8Co0.15Al0.05O2。利用X射线衍射(XRD)、扫描电镜(SEM)和恒电流充放电测试等方法对该材料的结构、形貌及电化学性能进行表征。考察氢氧化锂与前驱体物质的量之比(锂配比)、在煅烧过程中的压力、温度和时间等因素对LiNi0.8Co0.15Al0.05O2材料结构及性能的影响。结果表明：锂配比为1.02时，在0.4 MPa氧气压力下，于700 ℃煅烧10 h制备的材料具有最完善的结构和最好的电化学性能；在2.8~4.3 V电压范围内，以0.2 C进行充放电，首次放电比容量达到190.1 mA?h/g，50次循环后容量保持率为90.2%，同时显示出良好的倍率性能和高温性能。
关键词：锂离子电池；正极材料；LiNi0.8Co0.15Al0.05O2；加压氧化
LIU Wan-min1,2, HU Guo-rong1, PENG Zhong-dong 1, DU Ke1, CAO Yan-bing1, LIU Qiang1, HUANG Jin-long1
(1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. School of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411)
Abstract:The cathode materials LiNi0.8Co0.15Al0.05O2 were synthesized under elevated oxygen pressure from spheric Ni0.8Co0.15Al0.05(OH)2.05 prepared by controlled crystallization method. The materials were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and galvanostatic charge-discharge tests. The effects of molar ratio of Li to Ni+Co+Al, oxygen pressure, temperature and time during calcining on the material structure and electrochemical properties of LiNi0.8Co0.15Al0.05O2 were examined. The results show that, under the conditions of the molar ratio of Li to Ni+Co+Al of 1.02, oxygen pressure of 0.4 MPa, temperature of 700 ℃ and time of 10 h, the obtained material exhibits the most ordered structure and the best electrochemical performance. The initial discharge specific capacity of the material is 190.1 mA·h/g at 0.2 C in the voltage range of 2.8?4.3 V, and after 50 cycles, 90.2% of the initial discharge capacity of the material is maintained. Besides, the material also exhibits excellent rate capability and high-temperature performance.
Key words:lithium ion battery; cathode material; LiNi0.8Co0.15Al0.05O2; oxidation under elevated pressure
