摘要
采用改进共沉淀法制备LiC01／3Nil／3Mnl／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N（Nrl3H20）和分散N（PEO）。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NIl／3Co1／3Mnl／3（OH）2前躯体呈球形二次颗粒，粒径为2μm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LiC01／3Nil，3Mnl，302，振实密度达到2．78g／cm3，在0．2C倍率和2．80～4．25V的电压范围内，首次充、放电比容量分别为185．2和158．3mA-h／g，30次循环后放电比容量为142．8mA-h／g，容量保持率高达90．2％，电化学性能得到很大的改善。
LiCol/3Nil/3Mnl/302 cathode material was synthesized by improved coprecipitation method, which was compared with conventional coprecipitation method, NH3＂H20 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 Nil/3Cox/3Mnl/3（OH）2 precursor synthesized by improved coprecipitation method has spherical secondary particle with the diameter of about 2 ~rn assembled by the spherical and flaky primary particle, and the tap density of as-prepared LiCol/3Niu3Mna/302 calcinatedby 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.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第10期3780-3784,共5页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(21276286)
作者简介
通信作者:唐新村(1972-),男,湖南郴州人,博士,教授,从事锂电池正极材料研究,电话:13469431444,E-mail:tangxincun@163.com
