高压实富镍正极材料LiNi_(0.85)Co_(0.06)Mn_(0.06)Al_(0.03)O_2的制备  

Synthesis of Ni-Rich Layered LiNi_(0.85)Co_(0.06)Mn_(0.06)Al_(0.03)O_2 Cathode Material with High Compacted Density

作　　者：胡国荣[1] 谭潮溥[1] 杜柯[1] 彭忠东[1] 曹雁冰[1] 梁龙伟[1] 王伟刚[1] 

机构地区：[1]中南大学冶金与环境学院,长沙410083

出　　处：《无机化学学报》2017年第8期1450-1456,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.51602352)资助项目

摘　　要：通过控制结晶法制备高密度类球形Ni_(0.85)Co_(0.06)Mn_(0.06)Al_(0.03)(OH)_2前驱体,与LiOH·H_2O均匀混合后,在820℃于氧气气氛下进行高温煅烧,最终合成高压实富镍正极材料Li Ni_(0.85)Co_(0.06)Mn_(0.06)Al_(0.03)O_2。通过扫描电子显微镜(SEM)表征前驱体、正极材料及正极片的形貌;X射线衍射(XRD)表明材料具有良好的六方单相层状α-NaFeO_2结构,能谱仪(EDS)分析表明材料颗粒中各组分含量呈均匀分布。制备的LiNi_(0.85)Co_(0.06)Mn_(0.06)Al_(0.03)O_2正极材料具有良好的加工性能和很高的压实密度,极片压实密度达到了3.82 g·cm^(-3)。以该极片组装的模拟电池具有良好的电化学性能,尤其具有优异的倍率性能,在电压区间2.8~4.3 V和0.2C电流密度充放电条件下,首次放电比容量为211.7 mAh·g^(-1),首次充放电效率88.9%,5C大倍率充放电条件下容量仍达到180.2 mAh·g^(-1),循环200周容量保持率为80.4%。High density spherical precursor Ni0.85Co0.06Mn0.06Al0.03（OH）2 was obtained by controlled crystallization method. A uniform mixture of Ni0.85Co0.06Mn0.06Al0.03（OH）2 and LiOHH2O was sintered under 820℃ in O2 atmosphere to synthesize Ni-rich layered LiNi0.85Co0.06Mn0.06Al0.03O2 cathode material with high compacted density. SEM was used to characterize the morphology of the precursor, cathode material and positive electrode disk. XRD showed that the product possessed a well-layered α-NaFeO2 structure. EDS spectra show the elements in the material are distributed evenly. The material prepared by high temperature sintering shows good processing performance and high compacted density of 3.82 gcm-3. The cells with the material as cathode display excellent electro-chemical performance, especially rate capability：an initial discharge capacity of 211.7 mAhg-1 at 0.2C between 2.8 and 4.3 V with an initial coulombic efficiency of 88.9%, a discharge capacity of 180.2 mAhg-1 at 5C and a capacity retention rate of 80.4% after 200 cycles.

关 键 词：正极材料 共沉淀 高压实密度 高能量密度 大倍率充放电 

分 类 号：O646[理学—物理化学]