摘要
可充电的水系电池由于价格低廉、电极材料来源丰富和使用安全等优势而得到研究者们广泛关注.但是其在实用中还存在着能量密度和功率密度不足的问题.该研究以针状NiCo2O4纳米棒为水系电池正极材料,以Fe3O4纳米棒为负极材料组装成了一种NiCo/Fe电池储能器件.该储能器件表现出了优异的可充放电性能,在1.2kW/kg功率密度下(1 A/g),其最高容量可达207.7 Wh/kg(173mAh/g),在24kW/kg(20A/g)的高速率充放电速率下,其容量仍能保持70.8Wh/kg(59mAh/g).此外,得益于正负电极材料均为阵列结构并与基底结合牢固,该储能器件表现出优良的循环性能,即在电流密度为5A/g下经过2 000次循环后容量仍保持近80%.
Rechargeable aqueous battery has attracted so much attention as electrochemical energy storage device for its advantages of low-coat, material abundance and satisfactory safety, etc. Here, we constructed a device of NiCo/Fe aqueous battery, in which the NiCo2O4 nanorods were used as positive electrode and Fe3O4 nanorods as negative one. This device showed a very fascinating performance due to its unique designed nano-structure. The capacity reached 207 Wh/kg at a power density of 1.2 kW/kg and it still retained 70. 8 Wh/kg even at a high power density of 24 kW/kg. Additionally, the device also possessed a long cycle life because of the array nanostructure and the capacity retention was close to 80% even after 2 000 cycles at a current density of 5 A/g.
作者
朱前程
邱收
周建清
ZHU Qiancheng;QIU Shou;ZHOU Jianqing(Institute of Nanoscience and Nanotechnology,College of Physical Science and Technology,Central China Normal University,Wuhan 430079,China;No.1 Middle School Affiliated to Central China Normal University,Wuhan 430223,China)
出处
《华中师范大学学报（自然科学版）》
CAS
北大核心
2018年第4期489-495,共7页
Journal of Central China Normal University：Natural Sciences
基金
华中师范大学拔尖人才计划(华师行字[2015]195号)
华中师范大学优秀博士学位论文培育计划(2017YBZZ077)
华中师范大学研究生教育创新资助项目(2016CXZZ227)
