Production Process 2- Coating Uninterruptible Power Supply (UPS) is an...
The influence of coating surface density on battery capacity
The impact of coating surface density on battery capacity is reflected in the following aspects:
Directly affect the battery capacity
The coating surface density refers to the amount of active material coated on the positive and negative collector fluid, usually expressed in mg/cm² or mAh/cm². The coating density determines the mass ratio of the active substance inside the battery, which affects the capacity of the battery. When the coating density increases, the capacity of the battery will also increase accordingly, because more active substances can participate in the chemical reaction of the battery, providing more energy.
Affect the battery internal resistance and cycle performance
The size of the coating surface density will affect the battery internal resistance, and then affect the battery cycle performance. The polar plate with larger surface density makes the migration path of lithium ions longer, and the internal resistance of the battery is also larger, and congestion is easy to occur on the migration path of lithium ions, which will lead to lithium ions can not be completely removed in a short time, and finally lead to the loss of specific capacity.
Affect the safety of the battery
The density of the coating surface will affect the heat and pressure distribution inside the battery. When the coating surface density is too high, the heat and pressure inside the battery will increase, which is easy to cause safety accidents such as thermal runaway and battery explosion.
Affect the rate performance of the battery
the electrode plate with low surface density has a smaller change in the structure of the electrode plate caused by the continuous insertion and removal of lithium ions during charging and discharging. At the same time, the SEI film formed during formation is thin and stable, reducing the migration resistance of lithium ions in the SEI film. When the surface density is large, the interface resistance increases, thereby reducing the diffusion speed of lithium ions in the material, when the high current charging, lithium ions are not easy to come out of the material, easy to cause polarization, reversible lithium ions reduce, and therefore capacity attenuation.
Affect the life of the battery
The change of the internal resistance of the battery with different surface density after a certain number of cycles, which also reflects the influence of different surface density on the internal resistance of the battery. It can be seen from Table 1 that when the surface density is 150 g/m², the initial resistance of the battery is the smallest, and the internal resistance of the battery increases slightly after charging with high current. With the increase of surface density, the internal resistance of the battery increases, and the internal resistance of the battery increases greatly during the charge-discharge cycle.
CONCLUSION
In summary, the coating surface density is an important parameter that affects the battery capacity and battery performance, and it is necessary to reasonably control the coating surface density to achieve the best battery performance under the premise of ensuring battery performance and safety.
UPS BATTERY SERIES
UPS (Uninterruptible Power Supply) batteries are an important component of power supply systems designed to provide stable power support for electronic devices.
Extended reading
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