What are the factors that affect the capacity of lithium-ion batteries ?
2024-11-26
Usually when we use the battery, we will find that the battery is more and more insufficient, as if the capacity is getting smaller and smaller. So I will take you to understand what factors will affect the capacity of lithium-ion batteries in the process of use?
Structural changes of positive and negative electrode materials
When lithium ion is removed from the cathode material, the metal element will be oxidized to a high oxidation state, resulting in phase transfer and the change of bulk phase structure, which will lead to the change of lattice parameters and lattice mismatch, and ultimately lead to mechanical damage to the material structure, thus affecting the electrochemical performance of the battery . Negative electrode materials such as graphite will undergo structural changes during charging and discharging, resulting in a decrease in grain size and a change in crystal structure, which will affect the battery capacity .
Oxidative decomposition of electrolyte
The solvent and electrolyte of the electrolyte will decompose during the charging and discharging process, resulting in the loss of battery capacity. The decomposition and side reaction of the electrolyte is one of the main factors of the capacity attenuation of lithium batteries .
Fast charge and discharge
During fast charging, the current density is too large, and the negative electrode is seriously polarized, resulting in more obvious deposition of the lithium battery, thus affecting the capacity of the battery .
Long-term deep charge and discharge
Deep charge and discharge will lead to electrolyte volatilization and negative overreaction, affecting the delamination ability and capacity of the battery
Temperature
Temperature has a significant effect on battery capacity. At low temperatures, the discharge capacity of the battery will be significantly attenuated, especially at large discharge ratios.
Termination voltage
When the battery is discharged to a certain voltage value, there is a sharp drop in voltage, in fact, the energy obtained is very small, if long-term deep discharge, the damage to the battery is considerable.
Discharge rate
The capacity of the battery decreases with the increase of the discharge rate, that is, the greater the discharge current, the smaller the calculated capacity of the battery.
Energy density
Energy density is a key factor affecting the capacity of lithium batteries. The higher the energy density, the more charge stored per unit volume or weight, the greater the capacity of the battery
What are the factors that affect the capacity of lithium-ion batteries ?
2024-11-26
Usually when we use the battery, we will find that the battery is more and more insufficient, as if the capacity is getting smaller and smaller. So I will take you to understand what factors will affect the capacity of lithium-ion batteries in the process of use?
Structural changes of positive and negative electrode materials
When lithium ion is removed from the cathode material, the metal element will be oxidized to a high oxidation state, resulting in phase transfer and the change of bulk phase structure, which will lead to the change of lattice parameters and lattice mismatch, and ultimately lead to mechanical damage to the material structure, thus affecting the electrochemical performance of the battery . Negative electrode materials such as graphite will undergo structural changes during charging and discharging, resulting in a decrease in grain size and a change in crystal structure, which will affect the battery capacity .
Oxidative decomposition of electrolyte
The solvent and electrolyte of the electrolyte will decompose during the charging and discharging process, resulting in the loss of battery capacity. The decomposition and side reaction of the electrolyte is one of the main factors of the capacity attenuation of lithium batteries .
Fast charge and discharge
During fast charging, the current density is too large, and the negative electrode is seriously polarized, resulting in more obvious deposition of the lithium battery, thus affecting the capacity of the battery .
Long-term deep charge and discharge
Deep charge and discharge will lead to electrolyte volatilization and negative overreaction, affecting the delamination ability and capacity of the battery
Temperature
Temperature has a significant effect on battery capacity. At low temperatures, the discharge capacity of the battery will be significantly attenuated, especially at large discharge ratios.
Termination voltage
When the battery is discharged to a certain voltage value, there is a sharp drop in voltage, in fact, the energy obtained is very small, if long-term deep discharge, the damage to the battery is considerable.
Discharge rate
The capacity of the battery decreases with the increase of the discharge rate, that is, the greater the discharge current, the smaller the calculated capacity of the battery.
Energy density
Energy density is a key factor affecting the capacity of lithium batteries. The higher the energy density, the more charge stored per unit volume or weight, the greater the capacity of the battery
