纳米结构水系NiCo/Fe电池材料的制备及电化学性能的研究

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1.2 kW/kg功率密度下(1 A/g)，其最高容量可达207.7 Wh/kg(173 mAh/g)，在24 kW/kg(20 A/g)的高速率充放电速率下，其容量仍能保持70.8 Wh/kg(59 mAh/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5 A/g下经过2 000次循环后容量仍保持近80%.

Synthesis and electrochemical performance of nanostructured aqueous NiCo/Fe battery material

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 nanostructure. 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.