In our daily life, lithium-ion batteries are very common, for example, we use the phone, notebook, tablet and other equipment are relying on it to work, but you understand its principle? Do not understand the words quickly Xiao Bian together to learn about the working principle of Lithium Ion Power Bank it
1. Lithium Ion Power Bank works - Introduction
The Lithium Ion Power Bank refers to a secondary battery in which two compounds which are reversibly intercalated with deintercalated lithium ions are used as positive and negative electrodes, respectively. When the battery is charged, the lithium ions in the cathode are ionized into lithium ions and electrons, and lithium ions move toward the anode with electrons to synthesize lithium atoms. At the time of discharge, the lithium atoms are ionized from the anode surface of the graphite crystal into lithium ions and electrons, and lithium atoms are synthesized at the cathode. Therefore, in the battery lithium lithium in the form of lithium, will not appear in the form of lithium metal, so this battery is called Lithium Ion Power Bank.
2. Lithium Ion Power Bank works - structure
Lithium Ion Power Bank is a few years ago the emergence of lithium metal battery replacement products, the main components of the battery is positive and negative, electrolyte, diaphragm and shell.
Positive electrode --- can be used to absorb lithium-ion carbon, discharge, lithium into lithium ions, from the battery anode, to reach the Lithium Ion Power Bank cathode.
The negative materials are selected as potentials close to the lithium potential of the intercalable lithium compounds, such as various carbon materials including natural graphite, synthetic graphite, carbon fibers, mesophase carbon beads, and metal oxides.
Electrolyte --- mixed with LiPF6 ethylene carbonate, propylene carbonate and low viscosity diethylene carbonate and other alkyl carbonate with a mixed solvent system.
Diaphragms - Polyethylene microporous films such as PE, PP or their composite film, especially PP / PE / PP three-layer diaphragm not only low melting point, but also has a high anti-puncture strength, played a thermal insurance role.
Shell --- the use of steel or aluminum materials, cover components with explosion-proof power function.
3. Lithium Ion Power Bank works
Lithium Ion Power Bank works is the principle of its charge and discharge.
When the battery is charged, the battery has a positive lithium ion generation, the generated lithium ions through the electrolyte movement to the negative. And the negative carbon as a layered structure, it has a lot of holes, to reach the negative lithium ions embedded in the carbon layer of the pores, the more lithium ions embedded, the higher the charge capacity. At this time the positive reaction occurred:
The same token, when the battery discharge (that is, we use the battery process), embedded in the negative carbon layer of lithium ions out, and movement back to the positive. The more lithium ions returned to the cathode, the higher the discharge capacity. What we usually call the battery capacity is the discharge capacity. At this time the negative reaction occurred:
It is easy to see that in the Lithium Ion Power Bank charge and discharge process, the lithium ions from the positive → negative → positive movement of the state. If we likened the Lithium Ion Power Bank to a rocking chair, both ends of the rocking chair were the poles of the battery, and the lithium ion was like an excellent athlete, running back and forth at both ends of the rocking chair. So, the experts gave a Lithium Ion Power Bank a lovely name rocking chair battery.