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Author ：Iflowpower – Portable Power Station Supplier
I. The cause of lithium-ion battery drums is the reason for the reason for the reason for the cause of the lithium ion battery. The first type: manufacturer production process Problem is due to many manufacturers, many manufacturers are cost-effective, so that the production environment is bad, use will be eliminated equipment machine Wait, so that the coating of the battery is uneven, and dust particles are mixed in the electrolyte.
These are likely to make lithium-ion battery packs in the user's use, even more dangerous. Second: The second type of user daily usage habits is that the user itself, if the user uses improper use when using lithium-ion battery products, such as over charge over discharge, or continuous use in an extremely harsh environment, it is possible to make it possible to make Lithium-ion battery presence drum bag. Third: Long-term useless and inappropriate product leave, the original performance will basically fall, the battery is not used for a long time, and then there is no better preservation process.
When it is not used in the air long exposure, and the power is full. Since the air is electrically conductive, the time is too long, it is equivalent to direct contact with the positive and negative electrode of the battery, and the chronic short circuit is performed. Once the short circuit will heat, some electrolyte decomposition is even gasified, resulting in a drum bag.
The positive electrode material has a large proportion (generally at 70% to 80%), because the performance of the positive electrode material directly affects the performance of the lithium ion battery, and the cost is directly low. The positive electrode material accounted for 30% to 40% of the lithium ion battery, and also directly affects the energy density and performance of the lithium ion battery pack. The negative electrode material is composed of a material associated with a lower positive electrode potential, and has a high specific capacity and better charge and discharge, thereby maintaining good size and mechanical stability during an in-cell lithium (no severe deformation).
The negative electrode material is important to affect the efficiency of the lithium-ion battery, and the performance of the negative electrode material also directly affects the performance of the lithium-ion battery. The negative electrode material accounts for about 10 to 20% of the total cost of the lithium ion battery. On the category of the negative electrode, including carbon system, non-carbon-based negative electrode.
The electrolytic liquid electrolyte acts in transporting charge between the positive electrode and the negative electrode (similar to the carrier in radio), has a high ionic conductivity, generally should reach 1x10-3 ~ 2x10-2s / cm. It affects the energy density, wide temperature application, cycle life, power density, safety performance and other factors of lithium-ion battery packs. The diaphragm diaphragm has a certain pore diameter and porosity, ensuring the low resistance and high ion conductivity, has good permeability to the lithium ion, good infiltration of the electrolyte and has sufficient absorbent moisturizing ability, and hold ions.
Conductivity, while having electron insulation, ensuring the mechanical isolation of the positive and negative poles, in addition, there should be sufficient puncture strength, mechanical properties such as tensile strength and the corrosive resistance and sufficient electrochemical stability. Dynamic lithium battery has higher requirements for diaphragm, usually used in composite film. Lithium ion battery Working principle: Lithium ion battery is a rechargeable battery, which is important to rely on round-ejection embedding and deinterlating between lithium ions between the positive electrode and the negative electrode to achieve energy storage and release.
There are two phenomena in the process of charge and discharge: one. Excessive charging caused by overcharge can result in all the lithium atoms in the positive electrode material to the negative electrode material, resulting in a transition of the positive absorbed grid, which is also an important reason for the decline in lithium-ion battery. During this process, the lithium ions of the negative electrode are increasing, and the over-accumulation allows the lithium atom to be crystallized, so that the battery is bulging.
two. In the first charge and discharge process of the liquid lithium ion battery, the electrode material is reacted on the solid-liquid phase interface in the liquid lithium ion battery, forming a passivation layer covering the surface of the electrode material. The formed passivation layer film can effectively prevent the passage of the electrolyte molecule, but Li + can be freely embedded and disengaged by the passivation layer, and has the characteristics of the solid electrolyte, so this layer of passivation film is referred to as a solid electrolyte interface mask.
(SolideElectrolyteinterface), referred to as SEI. The SEI film will protect the negative electrode material, so that the material structure is not easy to collapse, and the cycle life of the electrode material can be added. The SEI film is not a constant, there will be a little change during the charge and discharge process, it is important that some organic matter will reversible changes.
After the battery is excessively discharged, the SEI film occurs reversible to break the ring, and the SEI destruction of the negative electrode material makes the negative electrode material collapse, thereby forming a bulk phenomenon.
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