Porous Rods of Different Metal Cobalt Oxide for Lithium-Air Battery
Date Issued
2014
Date
2014
Author(s)
Tsai, Yuan-Quei
Abstract
Because fossil fuels are consumed rapidly by human, it not only causes the energy crisis but also releases greenhouse gases which will damage to the global environment. Therefore, it is gradually being attention to develop green energy. In recent years, many countries continue to promote electric vehicles. Clean storage batteries have potential to replace gasoline to reach the goal of environmental protection in the future. Lithium-air battery has a high energy density that is higher than ten times compared with lithium-ion battery. It is possible to significantly enhance the traveling distance to help promote electric vehicles.
The study synthesized porous rods of different cobalt oxide (MCo2O4) by simple hydrothermal method for cathode of lithium-air battery.
The study explored what is the influence as catalytic process if Co is replaced by Mn, Fe, Ni and Zn. We identified the phase and crystallinity by XRD, observed the morphology by SEM and measured the valence of metals by XPS. We found the surface of FeCo2O4 existed highest ratio of Co3+. So, oxygen can be adsorbed onto active sites easier. In the other hand, Fe2+ maybe can release electron easily to reduced oxygen because d orbital of Fe3+ is half filled. So, it can get highest discharging plateau and lowest charging plateau from charge-discharge profile. The porous structure can also help to get high capacity (2350 mAh gc-1) and good cycling performance (40 cycles).
Subjects
鋰空氣電池
金屬氧化物
SDGs
Type
thesis
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