【Know Tungsten】Tungsten Trioxide Lithium Ion Battery

1. Lithium Ion Battery in Daily Life
Lithium-ion batteries have become the main power source choice for portable electronic devices due to their large capacity, high voltage, and long life. In order to further satisfy people's demand for higher-performance lithium-ion batteries, it is an effective solution to find alternative electrode materials with better electrochemical characteristics.

2. Tungsten Trioxide Advantages
Tungsten trioxide has theoretical capacity of 690 mAh g-1, larger specific surface area, smaller crystal size. It can provide more reactive potential and shorter lithium ion diffusion length, which is beneficial to improve electrochemical performance.

3. Tungsten Trioxide Morphology
Tungsten Trioxide Nanoflowers
As shown in the figure, the synthesized product presents a flower-like morphology, and the size of the nanoflower is relatively uniform, the diameter of the nanoflower is about 5 microns. The length of the nanowire constituting the nanoflower is about several hundred nanometers.

Tungsten Trioxide Nanowires
The figure below shows the morphology of the nanowire. It can be observed  that the length of the nanowire is as long as ten micrometers, and these nanowire are arranged together in a certain direction. The diameter of the nanowire is relatively uniform, forming a ribbon.

4. Electrochemical Performance Test
Charge and Discharge Curve
The charge and discharge capacity of nanoflowers is  higher than nanowires, as well as the reversible capacity. The reason for this phenomenon may be that the specific surface area of the tungsten trioxide nanoflower is larger than that of the nanowire.

Rate Performance
It can be observed from the figure that both have excellent rate stability performance.

5.Conclusion
The two structures have good cycling ability and stability under constant current.
The capacity of nanoflowers is higher than that of nanowire, which may be attributed to the larger specific surface area of tungsten trioxide nanoflowers than nanowire.
The rate performance tests of the two structures show that both nanowire and nanoflower have good rate stability.
Tungsten trioxide turns out to be the ideal material for lithium ion battery to replace cobalt.

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