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According to foreign media reports, in modern life, the conversion of kinetic energy such as tides and wind energy into electrical energy has become a common practice. When we walk, drive, and even resonate from environmental sounds, it is a transformation of energy.
Recently, scientists from the Georgia Institute of Technology in the United States have created a brand-new invention that will push energy use to a new level. A team led by Prof. Zhonglin Wang (Materials and Materials Science) has developed a method for compressing Advanced battery that can be automatically charged.
According to reports, although the current battery version is relatively small, only a few hundred millivolts of power can be squeezed out, but if the battery has a slightly larger charge, it can be used as a backup battery in electronic devices. The researchers said that the pressure rechargeable battery also has a positive electrode and a negative electrode, and the negative electrode and the positive electrode are respectively lithium cobalt oxide and titanium dioxide. Among them, the positive electrode is connected to a thin titanium film by a tiny nanometer type catheter. The negative and positive electrodes are separated by a polyvinylidene fluoride film called "PVDF".
"PVDF" is a kind of piezoelectric material. When it is placed under compression, tension and bending, it can generate current. The current of the battery is generated by the lithium ion from the pressure driver from the negative electrode to the positive electrode. Lithium ions form. Lithium titanium oxide, which in turn stores electricity. Although the electric field disappears when the pressure is released, lithium ions are still stored in the positive electrode of the battery. The reason why the positive and negative electrodes of the battery are connected by a circuit is to allow lithium ions to flow back to the negative electrode of the battery when they are cycled again.
It is understood that as long as the battery is pressed more than two times, it will generate 395 millivolts per second in just four seconds, which is similar to the frequency of the foot landing on the human when walking. During the experiment, the researchers discovered that the battery would emit a milliampere of current in two minutes. But if you want to improve the power generation efficiency of the battery, you have to overcome a big obstacle, that is, the metal shell of the battery, because the shell cannot convert all the mechanical energy under pressure. (Shang Li)
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