【摘要】 兼具锂离子电池高能量密度和双电层电容器高功率特性的锂离子电容器成为了现今超级电容器性能提升的重点发展方向。本工作以高富锂金属氧化物Li₂NiO₂为锂离子电容器用负极锂源,将其与活性物复合组成正极电极,并制备出"无金属锂片"预嵌锂过程的300 F锂离子电容器,考察了金属氧化物Li₂NiO₂的理化性能与电化学特性、不同Li₂NiO₂添加量对锂离子电容器样品的电化学性能影响。结果表明,Li₂NiO₂材料具有398m A·h/g的首次不可逆容量,首次放电不可逆率为94.8%。添加15%²0%Li₂NiO₂的样品在10 A电流下具有大于75%倍率特性以及91%的容量保持率。当Li₂NiO₂添加量为20%时,样品在1 A条件下具有400 F的容量,15.5W·h/kg的能量密度以及11.3 k W/kg的功率密度,是一种制备工艺简单、性能优异的新型锂离子电容器。更多还原

【Abstract】 Combining the advantages of Lithium ion battery’s high energy density and electric double layer capacitor’s excellent power performance, Lithium ion capacitor has been regarded as one of the most important research area for supercapacitors. Using high capacitance Li₂NiO₂ as the Li⁺ resources for negative electrode, composited activated carbon as the positive electrode, a 300 F lithium ion capacitor has been prepared without "lithium foil" during the pre-doping process. The physical and electrochemical performance of Li₂NiO₂ and the adding amount of Li₂NiO₂ have been investigated. The results shows that: Li₂NiO₂ exhibits a distinctively high irreversible capacity of 398 m A·h·g^-1 with an irreversible capacity ratio of 94.8% during the first cycle. After adding 15%²0% Li₂NiO₂ for the lithium ion capacitors, it shows more than 75% rate performance at 10 A and nearly 91% capacitance retention during the cycle life time. When adding 20% Li₂NiO₂ at the composite electrode, the cell has nearly 400 F capacitance, 15.5 W·h·kg^-1 energy density and 1.3 k W·kg^-1 power density. Meantime, the simply making process will prompt this kind of lithium ion capacitor to embracing a bright future.更多还原