Many times, when people go out, they will encounter the situation that the mobile phone is out of power and forget to bring the power bank and charger, which brings certain inconvenience to life. If there is such a piece of clothing, it looks no different from ordinary clothes, but it can wirelessly charge mobile phones and other electronic devices. Isn’t it exciting?
Recently,
researchers from Fudan University have developed a wearable battery
fabric that can not only wirelessly charge mobile phones, but also
provide sufficient energy for smart fibers that monitor human health
data. Moreover, after repeated washing and folding, it can still
maintain stable electrochemical and mechanical properties.
The
classic plane coating method is difficult to apply to high-curvature
fibers, because when the fiber surface is coated, uneven coating such as
beads is easily generated on the surface, which seriously affects the
continuity and electrochemical performance of the fiber electrode
preparation. Battery performance.
However,
the team further obtained high-performance and high-safety large-area
battery fabrics through weaving methods. They used a 1.5-square-meter
"cloth" to demonstrate that the preparation of display devices can be
effectively integrated with the fabric weaving process, and
multifunctional micro-light emitting devices are integrated at the
interweaving points of polymer composite fibers to realize large-area
flexible display fabrics and intelligent integrated systems.
In addition, the preparation of fiber lithium ion batteries
mainly faces two difficulties. First, the internal resistance of fiber
lithium batteries has an important influence on its electrochemical
performance, but the relationship between its internal resistance and
fiber length is still not very clear; Second, because of the completely
different device structure, the electrode preparation and device
construction methods for bulk lithium-ion batteries are difficult to
apply to fiber lithium batteries.
After
repeated experiments, when the device is 1 meter in length, the fiber
lithium-ion battery has a capacity of 25mAh, which can provide more than
2 days of power for commercial wearable devices such as heart rate
monitors and oximeters. The energy density based on the overall mass
exceeds 85 Wh/kg.
At the same time, fiber lithium-ion batteries
have good cycle stability. After 500 cycles, the battery capacity
retention rate still reached 90.5%, and the coulombic efficiency was
99.8%. Even in the case of a radius of curvature of 1cm, the capacity
retention rate of the fiber lithium ion battery after bending 100,000
times is still greater than 80%.
In
general, this fully flexible fabric can not only wirelessly charge
mobile phones and other electronic devices, but also has the advantages
of wear-resistant, foldable, and machine-washable repeatedly. Moreover,
its price is US$0.05 per meter, laying a good foundation for mass
production.
BENZO Energy Technology Co.,Ltd
UFine Technology Co., Ltd
Site: www.bz-battery.com / www.benzoenergy.com
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