摘要
采用改良的共沉淀法制备球形Li Ni_(0.8)Co_(0.15)Al_(0.05)O_2正极材料。以异丙醇铝作为铝源制备Ni_(0.8)Co_(0.15)Al_(0.05)(OH)_2前驱体,将前驱体预烧产物与Li OH·H2O混合,进行高温固相反应。研究焙烧温度及时间对产物晶体结构和电化学性能的影响。在735℃下焙烧16 h制备的产物的层状结构最完善,倍率性能最好,在3. 0～4. 3 V充放电,在5. 0 C倍率下的放电比容量为150 m Ah/g;在735℃下焙烧13 h制备的产物循环性能最好,以0. 5 C倍率循环100次,容量保持率为98. 00%。
A modified co-precipitation method was employed to synthesize spherical LiNi0.8Co0.15Al0.05O2 cathode material.TheLiNi0.8Co0.15Al0.05(OH)2 precursor was prepared using aluminium isopropoxide as aluminium source,then the solid-state-reaction was conducted using the mixture of the pre-sintering products of precursor and LiOH·H2O.The effects of calcination temperature and time on the crystal structure and electrochemical performance of LiNi0.8Co0.15Al0.05O2 material were studied.The products prepared by calcined at 735℃ for 16 h had the most complete layered structure,exhibited the best rate capability,when charged-discharged in 3.0 -4.3 V,the specific discharge capacity at the rate of 5.0 C was 150 mAh/g;the products prepared by calcined at 735℃ for 13 h had the best cycle performance,the capacity retention at the rate of 0.5 C after 100 cycles was 98.00%.
作者
贺晓书
杜春雨
尹鸽平
HE Xiao-shu;DU Chun-yu;YIN Ge-ping(School of Chemical Engineering and Technology,Harbin Institute of Technology,Harbin,Heilongfiang 150001,China)
出处
《电池》
CAS
CSCD
北大核心
2018年第6期384-387,共4页
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