摘要
以柠檬酸为螯合剂,采用溶胶-凝胶法通过调节煅烧温度和陈化时间制备了不同粒径的富锂正极材料Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_2。结果表明材料的粒径随煅烧温度增加,逐渐增大;随着陈化时间的增加,呈现先增大后变小的趋势。当煅烧温度为850℃,陈化时间为10 d时,材料具有最优的电化学性能,尤其是倍率性能。在2.0~4.8 V的电压范围内以0.1 C充放电循环60周后放电比容量仍为206.7 m Ah·g-1,2.0 C时的放电比容量为125.6 m Ah·g-1。
To meet the increasing demand for lithium-ion batteries, the electrochemical properties of Li- rich layered oxides （LLOs）, Li1.2Mn0.54Ni0.13Co0.13O2, one of the cathodes with high capacity, are still needed to be improved. Using citric acid as a chelating agent, the LLOs with different particle sizes were prepared by sol-gel method under different calcination temperature and aging times. The samples were characterized by X-ray diffraction and scanning electron microscopy. The results indicate that the particle size grows with the increase of calcination temperature, and firstly increases and then decreases when the aging time is prolonged. When the calcination temperature is 850 ~C and ages for 10 days, the material presents the best electrochemical performance, especially rate performance. When the Li1.2Mn0.54Ni0.13Co0.13O2 electrode is charged and discharged at 0. 1 C between 2.0 - 4.8 V, the discharge capacity is still 206.7 mAh·g^-1 after 60 cycles and the discharge capability is 125.6 mAh·g^-1 at 2, 0 C.
出处
《化学工业与工程》
CAS
CSCD
2018年第1期1-7,共7页
Chemical Industry and Engineering
基金
国家高技术研究发展计划(2013AA050901)资助项目
