改进共沉淀法制备LiCo1/3Ni1/3Mn1/3O2正极材料
来源期刊：中南大学学报(自然科学版)2012年第10期
论文作者：谌谷春 唐新村 王志敏
文章页码：3780 - 3784
关键词：改进共沉淀法；LiCo1/3Ni1/3Mn1/3O2；球形二次颗粒
Key words：improved coprecipitation method; LiCo1/3Ni1/3Mn1/3O2; spherical secondary particle
摘 要：采用改进共沉淀法制备LiCo1/3Ni1/3Mn1/3O2正极材料，该法与传统共沉淀法相比，在共沉淀的过程中增加络合剂(NH3·H2O)和分散剂(PEG)。对比研究2种方法制得的产品的形貌和性能。研究结果表明：采用改进共沉淀法制备得到的Ni1/3Co1/3Mn1/3(OH)2前躯体呈球形二次颗粒，粒径为2 μm左右，是由球形和片状的一次颗粒组装而成；其与LiOH充分研磨煅烧制得的正极材料LiCo1/3Ni1/3Mn1/3O2，振实密度达到2.78 g/cm3，在0.2C倍率和2.80~4.25 V的电压范围内，首次充、放电比容量分别为185.2和158.3 mA·h/g，30次循环后放电比容量为142.8 mA·h/g，容量保持率高达90.2%，电化学性能得到很大的改善。
Abstract: LiCo1/3Ni1/3Mn1/3O2 cathode material was synthesized by improved coprecipitation method, which was compared with conventional coprecipitation method, NH3·H2O for chelator and PEG for dispersant were added into the solution during the process of preparing the precursor. The appearance and property of products prepared by improved and conventional coprecipitation method were studied. The result reveals that Ni1/3Co1/3Mn1/3(OH)2 precursor synthesized by improved coprecipitation method has spherical secondary particle with the diameter of about 2 μm assembled by the spherical and flaky primary particle, and the tap density of as-prepared LiCo1/3Ni1/3Mn1/3O2 calcinated by precursor and LiOH is 2.78 g/cm3. Besides, its the initial charge/discharge capacity is 185.2/158.3 mA·h/g at 0.2C rate in voltage range of 2.80-4.25 V, respectively, and 90.6% of the initial discharge capacity is retained after 30 charge-discharge cycling, electrochemical performance is greatly improved.
谌谷春1，唐新村1,2，王志敏1
(1. 中南大学 化学化工学院，有色金属资源化学教育部重点实验室，湖南 长沙，410083；
2. 中南大学 粉末冶金国家重点实验室，湖南 长沙，410083)
摘 要：采用改进共沉淀法制备LiCo1/3Ni1/3Mn1/3O2正极材料，该法与传统共沉淀法相比，在共沉淀的过程中增加络合剂(NH3·H2O)和分散剂(PEG)。对比研究2种方法制得的产品的形貌和性能。研究结果表明：采用改进共沉淀法制备得到的Ni1/3Co1/3Mn1/3(OH)2前躯体呈球形二次颗粒，粒径为2 μm左右，是由球形和片状的一次颗粒组装而成；其与LiOH充分研磨煅烧制得的正极材料LiCo1/3Ni1/3Mn1/3O2，振实密度达到2.78 g/cm3，在0.2C倍率和2.80~4.25 V的电压范围内，首次充、放电比容量分别为185.2和158.3 mA·h/g，30次循环后放电比容量为142.8 mA·h/g，容量保持率高达90.2%，电化学性能得到很大的改善。
关键词：改进共沉淀法；LiCo1/3Ni1/3Mn1/3O2；球形二次颗粒
CHEN Gu-chun1, TANG Xin-cun1,2, WANG Zhi-min1
(1. Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education,
School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)
Abstract:LiCo1/3Ni1/3Mn1/3O2 cathode material was synthesized by improved coprecipitation method, which was compared with conventional coprecipitation method, NH3·H2O for chelator and PEG for dispersant were added into the solution during the process of preparing the precursor. The appearance and property of products prepared by improved and conventional coprecipitation method were studied. The result reveals that Ni1/3Co1/3Mn1/3(OH)2 precursor synthesized by improved coprecipitation method has spherical secondary particle with the diameter of about 2 μm assembled by the spherical and flaky primary particle, and the tap density of as-prepared LiCo1/3Ni1/3Mn1/3O2 calcinated by precursor and LiOH is 2.78 g/cm3. Besides, its the initial charge/discharge capacity is 185.2/158.3 mA·h/g at 0.2C rate in voltage range of 2.80-4.25 V, respectively, and 90.6% of the initial discharge capacity is retained after 30 charge-discharge cycling, electrochemical performance is greatly improved.
Key words:improved coprecipitation method; LiCo1/3Ni1/3Mn1/3O2; spherical secondary particle
