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Self-discharge factor of lithium battery

Self-discharge factor of lithium batteryThe secondary battery has a self-discharge phenomenon, and the voltage is relatively high and the self-discharge rate is relatively low, and is a selling point of the lithium battery. What is self-discharge? The battery initially has a certain amount of electricity, which is turned on for a period of time in the predetermined environment. The battery has as much power as much as possible, is the chargeable capacity of the battery, and the ratio of the remaining power and the original power is the self-discharge rate.

The self-discharge rate of the lithium-ion battery is determined in the type and structure of the electrode material, the interface properties of the electrode / electrolyte, the composition of the electrolyte, and the production process of the battery, etc., the self-discharge ratio is typically reduced by the capacity of the unit time to reduce the percentage:
X = (before -C -C) / (¡Á XT) x) ¡Á 100%
In the formula, before, the C is the capacity of the battery before and after storage; T is the storage time, the usual month or year representation. The self-discharge ratio of the commercial lithium-ion battery is usually about 10% per month, although it is not high compared to the Ni-CD battery (30%), but is not low compared to the front lead acid battery ((5%). There is mainly aspects of the following mains due to the self-discharge of lithium ion batteries.

A, self-discharge of the negative electrode. The self-discharge of the negative electrode is primarily derived from the lithium of the negative electrode or into the form of Li +, and the rate of electrolyte depends on the surface condition and surface catalytic activity of the negative electrode, and the surface condition of the negative electrode is very obvious, so that the composition of the electrolyte can be optimized. Reduce the self-discharge rate of the battery.

B. Self-discharge of the positive electrode means that the lithium ion in the electrolyte is embedded in the lattice of the positive electrode material, thereby causing the positive electrode from discharge. The rate depends on the dynamic factor in the positive electrode of Li + embedded, mainly the boundaries of the positive / electrolyte.

In addition, the emergence of impurities in the electrolyte is also an important reason for the battery self-discharge, because the oxidation potential of the impurities is generally lower than the positive potential of the lithium ion battery, which is easy to oxidize the surface of the positive electrode, and its oxide will be reduced in the negative electrode, thereby constantly The active substance consumes the positive and negative electrode material. Causes self-discharge. Therefore, the composition and purity requirements of the lithium ion battery on the electrolyte are hig  Recommend: LiFePO4 Battery Manufacturer Energy storage battery Manufacturer Integrated machine energy storage battery series Manufacturer Lead lithium battery Manufacturer Outdoor Backup Battery Manufacturer Portable outdoor power supply Manufacturer Power battery Manufacturer Powerwall LiFePO4 Battery Manufacturer Battery rack Manufacturers Telecom LiFePO4 Battery Manufacturer Wall mounted battery storage Manufacturer China Lifepo4 Battery