Introduction to the Principle of 12V Lithium Battery

12 Lithium-ion batteries(also known as rocking chair batteries) refer to two different secondary battery systems that can reversibly insert and remove lithium ions from the lithium ion embedded lithium compounds as positive and negative batteries. So what is the principle of lithium-ion batteries? The following small editor to introduce the principle of lithium-ion batteries.

What is the Principle of Lithium-ion Battery

Positive structure

LiCoO2(lithium cobalt acid) + conductive agent(acetylene black) + binder(PVDF) + set fluid(aluminum foil) positive pole

Negative structure

Graphite + electroconductive(acetylene black) + thickener(CMC) + binder(SBR) + set fluid(copper foil) negative electrode

Construction of the core

The positive electrode of the core is LiCoO2 conductive agent and adhesive. It is coated on aluminum foil to form a positive plate. The negative electrode is a layered graphite conductive agent and adhesive coated on a copper foil substrate. Now the more advanced negative layer graphite particle has been selected. Nanocarbon.

According to the above mechanism of repercussions, the positive poles are LiCoO2, LiNiO2, and LiMn2O2, where LiCoO2 is a crystal with a very stable layer structure, but when the XLi is removed from LiCoO2, its structure may change, but it does not change depending on the size of X. Discover by discussion when X & GT; At 0.5, the structure of Li1-XCoO2 is extremely unstable, and crystalline collapse occurs. Its external performance is the overwhelming end of the core. Therefore, during the operation of the core, the X value in Li1-XCoO2 should be controlled by limiting the charging voltage. In general, the charging voltage is not more than 4.2 V then X is less than 0.5, and the crystal shape of Li1-XCoO2 is still stable. The negative pole C6 has its own characteristics. When it is first converted, Li in the positive pole LiCoO2 is filled to the negative pole C6. When the discharge occurs, Li returns to the positive pole LiCoO2, but after the transformation, some Li must remain in the negative pole C6. The heart ensures that the next charge and discharge Li is normally embedded, otherwise the core is overwhelmed by a short time. In order to ensure that part of Li remains in the negative pole C6, it is generally done by binding the discharge lower voltage. Therefore, the safety charging upper voltage of the lithium core ≤ 4.2 V, and the discharge lower voltage ≥ 2.5 V.

The inner structure of the lithium ion battery is spiral-shaped, and the positive and negative poles are separated by a layer of thin film paper with many slender holes. Lithium-ion core is a new type of battery power. It does not contain metallic lithium. In the process of charging and discharging, only lithium ions move between positive and negative poles. Electrodes and electrolytes do not participate in the response. The energy capacity density of the lithium ion core can reach 300 W/L, and the component capacity density can reach 125 Wh/L. The response mechanism of the lithium ion core is to follow the process of charging and discharging. Lithium ions are embedded in and out of the positive and negative poles, and there is no presence of metallic lithium inside the core, so the lithium ion core is safer and more stable. Lithium cobalt acid is used as the positive electrode of lithium ion batteries, and aluminum foil is the positive collector fluid; The negative electrode uses carbon, the negative set fluid is copper foil, and the electrolyte of the lithium ion battery is an organism that dissolves the LiPF6.

The positive electrode data for lithium ion batteries is lithium cobalt oxide and the negative electrode is carbon. When the battery is charged, lithium ions are generated on the positive electrode of the battery, and lithium ions of raw tea pods move to the negative electrode through the electrolyte. As a negative carbon, it has a layered structure. It has many micropores. Lithium ions that reach the negative pole are embedded in the micropores of the carbon layer. The more lithium ions embedded, the higher the charging capacity. In the same way, when the party discharges the battery(that is, when we use the battery), the lithium ions embedded in the negative carbon layer are released and there is movement back to the positive pole. The more lithium ions that return to the positive pole, the higher the discharge capacity. What we generally refer to as battery capacity is discharge capacity.

There are explosion holes on the lithium-ion battery cap. In the case of excessive internal pressure, the explosion hole will actively open the pressure to avoid blasting.

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