论文部分内容阅读
以Ni(NO_3)_2·6H_2O、Co(NO_3)_2·6H_2O、Mn(NO_3)_2和LiNO_3为金属原料,以柠檬酸为螯合剂和燃料制备出均一的前驱体。前驱体经干燥后在氧弹中快速爆燃制备出纳米LiNi_(1/3)Co_(1/3)3Mn_(1/3)O_2粉体,并生成了高结晶度的LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2材料,其平均粒径约为200nm。将其分别在2.8～4.6V和2.8～4.3V电压范围内以0.05C速率恒流充放电,首次放电比容量分别为208.0mAh·g~(-1)和173.6mAh·g~(-1);以0.1C速率分别在2.8～4.6V和2.8～4.3V电压范围内循环20周后,容量保持率分别为89.3%和93.4%。
Ni (NO_3) _2 · 6H_2O, Co (NO_3) _2 · 6H_2O, Mn (NO_3) _2 and LiNO_3 were used as metal raw materials and citric acid as chelating agent and fuel to prepare homogeneous precursors. The precursors were rapidly deflagrated in oxygen bomb to prepare LiNi 1/3 Co 1/3 (1/3) 3Mn 1/3 O 2 powders, and the high crystallinity LiNi 1/3 Co_ (1/3) Mn_ (1/3) O_2 material with an average particle size of about 200 nm. The charge and discharge were performed at a constant current of 0.05 C in the voltage range of 2.8 ~ 4.6V and 2.8 ~ 4.3V respectively. The first discharge capacities were 208.0mAh · g -1 and 173.6mAh · g -1, respectively. ; The capacity retention rates were 89.3% and 93.4%, respectively, at 0.1C rate for 20 weeks at 2.8 ~ 4.6V and 2.8 ~ 4.3V respectively.