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Lithium-ion battery structure and principle

Author: Source: Datetime: 2016-10-06 14:28:14

Lithium-ion batteries are mainly composed of positive and negative materials, electrolyte, separator, collector and battery shell composition, positive and negative materials from two different lithium-ion intercalation compounds.


When charged, the lithium ions from the positive electrode de-embedded through the electrolyte through the diaphragm embedded in the negative, the discharge is the opposite, it usually use in solar powered portable generator. In the first lithium-ion battery charge and discharge process, the anode and electrolyte interface can form a layer of passive film. It plays a role as separator between the electrode and the electrolyte. It is an excellent conductor of lithium ion for the electronic insulator.


The lithium ion can be inserted and released freely through the passivation layer, which has the characteristics of solid electrolyte. Known as the "solid electrolyte interface film" (solidel ectrolyte interface), referred to as SEI film. Lithium-ion battery charge and discharge electrode reaction:


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With the development of technology and technology maturity, the application of lithium-ion battery more and more widely. Lithium-ion batteries have the advantages of high monomer voltage, relatively light weight, and environmental friendliness, but after a number of cycle charge-discharge cycle, there will be a decline in battery capacity and other properties.


The same conditions, the faster the battery capacity decay, the battery quality is relatively poor. Lithium-ion battery cycle performance is an important indicator of its quality, many of the standards on lithium-ion batteries have a cycle life of this project.


Lithium-ion battery charge and discharge cycle is a complex physical and chemical reaction process, the cycle life of many factors, such as LiFePo4 battery pack charging and discharging. On the one hand with the characteristics of the battery itself, such as design, manufacturing processes and material performance degradation; the other hand with the use of the battery affected by the outside world, such as the use of the environment and charge and discharge system.

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