Causes of lithium battery capacity

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

Battery capacity is one of the important performance indicators of lithium battery performance. Capacity reduction has a large part of the principle of lithium batteries, and the capacity of lithium battery pack is reduced, and there is more common, recession. , More important factors, the self-discharge rate is different, resulting in the unbalanced battery capacity of the series core, which ultimately causes lithium battery capacity to be non-durable.

What is the low level of lithium battery capacity? A high oxidation state, here is accompanied by the transformation of components. The transformation of components can easily lead to changes in phase transfer and physical phase structure. The electrode material phase transition can cause changes in lattice parameters and lattice mismatch, thereby generating induced stress causes crushing of grains, and initiates crack propagation, resulting in mechanical damage to the structure of the material, thereby causing electrochemical properties of lithium battery attenuation.

2, the negative electrode material structure commercialized negative electrode material commonly used in lithium batteries has carbon materials, lithium titanate, etc., this paper analyzes the typical negative graphite. The attenuation of lithium battery capacity occurs for the first time, in this stage, SEI is formed on the surface of the negative electrode, consuming part of lithium ions.

As the lithium battery is used, the change in graphite structure can also cause a decrease in battery capacity. The study found that the carbon material after the circulation maintained the morphosography of graphite, but the half of the crystal surface of the crystal surface became large, resulting in a small grain size in the C-axis direction, and the change in the crystal structure caused cracks. Further, the SEI film of the negative electrode surface and promotes the repair of the SEI film, and the excessive growth of the SEI film is consumed, thus causing the irreversible capacity attenuation of lithium batteries.

3. The electrolyte mainly includes three parts of solvent, electrolyte and additives. The decomposition of the solvent, the decomposition of electrolytes can cause loss of battery capacity.

The decomposition and side reaction of the electrolyte is the main factor of lithium battery capacity attenuation. Regardless of the positive and negative electrode material, which process, with the lithium battery circulation, the decomposition of the electrolyte and the interface between the normal and negative electrode material The reaction can cause the capacity attenuation. 4.

The battery spontaneous wrap is limited by the fixed space. The copper foil cannot be freely stretched to generate pressure. Under the action of pressure, the original crack diffuses growth, due to the uneven space, the copper foil is broken.

5, long-term depth charge and discharge discharge discharge to transfer from internal structures, one is to cause excessive volatilization of electrolytes, and the second is that the negative electrode of lithium batteries causes changes in the dielectric membrane to decrease, form capacity permanent Loss; charging mainly from voltage stability and high-voltage voltage pressure, the charger that has stopped charging, the voltage increases, resulting in charging, resulting in battery overcharge, causing the varying capacity loss of the positive electrode material structure, discharge oxygen The electrolytic solution is strenuously oxidized and the combustion explosion; the electrolyte organic solvent / electrolyte lithium salt decomposition; the negative electrode analysis can cause the negative electrode copper concentrator to dissolve, positive to form copper graphics. 6. Temperature factor temperature is definitely one of the key factors affecting lithium battery life.

Excessive temperatures or excessive temperatures can cause reduction in active lithium ion content, thereby reducing lithium battery life. Causes of battery capacity decline: 1. Electrical core aging, decline.

2. Different self-discharge rate, resulting in unbalanced series core electricity, ultimately leading to lithium battery capacity reduced non-durable. 3.

In the battery and charge and discharge process, "vulcanization" phenomenon affects battery capacity. Lithium battery power is unbalanced, how to return to normal? 1, first charge the entire lithium battery pack, floating after the light is 2 to 3 hours. If the battery pack is long-term loss, it has not been allowed to charge the electricity, and can directly charge the protector for 10 minutes (charge the discharge port), then charge it.

2, unplug the cable, before unplugging, please do a good marker, 2 cables, the cable cannot be inserted. Measuring the voltage of adjacent pins on the cable, if it is 48V, there are 16 voltages, 60V is 20 voltages. The first string voltage starting at the negative electrode is a voltage from the battery pack to the first root cable, and other push.

Find a single string of voltage below 3.50V, determine the positive and negative poles, and tag. 3.

Use a 3.6V charger to charge a single string of the voltage below 3.50V to 3.

60 to 3.70V. However, there is a need to be worthwhile, and it is strictly prevented that the charging causes lithium batteries.

4, insert the cable according to the original order, pay attention to not reverse, install the battery, can be put into use. The capacity of the lithium battery has been used continuously, and its capacity will naturally attenuate. It is manifested in the voltage reduction, and the capacity is insufficient.

This is related to the material characteristics of the lithium battery. Simple understanding is that the activity of lithium ions will continue to decrease, until final The capacity is all attenuated. In order to extend the life of the lithium battery, it is generally recommended to use a lithium battery in a shallow and shallow manner, do not use lithium batteries, or to charge when it is fast, it is unfavorable for lithium battery life.

The essence of the decrease in lithium battery capacity is decreased by the decrease in the decrease in lithium ion, and its factors are mainly the structural destruction or inactivation of the positive and negative electrode materials, the decomposition of the electrolyte, the abuse of the lithium battery, etc. It is usually necessary to use a lithium battery correctly to extend the life of the lithium battery.

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