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What is the charge and discharge principle of ternary lithium ion battery?

What is the charge and discharge principle of ternary lithium ion battery?

The full name of ternary lithium-ion battery is ternary polymer lithium battery. Ternary polymer lithium battery refers to the lithium battery which uses ternary positive electrode material lithium nickel-cobalt-manganate (Li(NiCoMn)O2). The precursor product of ternary composite positive electrode material takes nickel salt, cobalt salt and manganese salt as raw materials, and the proportion of nickel, cobalt and manganese in it can be adjusted according to actual needs. Compared with lithium cobalt acid battery, the battery with ternary material as positive electrode has higher safety.

1.Charging of ternary lithium ion batteries
The maximum charge termination voltage of a single lithium-ion battery is 4.2V, which cannot be overcharged, otherwise the battery will be scrapped due to the loss of too much lithium ions in the positive electrode. When charging lithium-ion batteries, special constant-current and constant-voltage chargers should be used. After constant-current charging until the voltage at both ends of lithium-ion batteries is 4.2V, the charging mode will be switched to constant-voltage charging mode. Stop charging when the constant voltage charging current drops to 100mA.
Charging current (mA) can be 0.1 ~ 1.5 times the battery capacity, such as: 1350mAh lithium ion battery, its charging current can be controlled between 135mA ~ 2025mA. Conventional charging current can be selected at about 0.5 times the battery capacity, charging time is about 2 ~ 3 hours.

2. Discharge of ternary lithium ion batteries
Due to the internal structure of lithium-ion batteries, all lithium ions cannot move to the positive electrode when discharging, so a part of lithium ions must be kept in the negative electrode to ensure that lithium ions can be smoothly embedded into the channel during the next charge. Otherwise, battery life will be shortened. In order to ensure that some lithium ions remain after discharge in the graphite layer, the minimum voltage of discharge termination must be strictly limited, that is to say, the lithium-ion battery can not overdischarge.

The discharge termination voltage of a single lithium-ion battery is usually 3.0V, with a minimum of 2.5V. Battery discharge duration is related to battery capacity and discharge current. Battery discharge time (hour)= battery capacity/discharge current, and lithium ion battery discharge current (mA) should not exceed 3 times the capacity of the battery, for example: 1000mAh lithium ion battery, the discharge current should be strictly controlled within 3A, otherwise it will cause battery damage.

It is not difficult to see that in the charging and discharging process of lithium ion battery, lithium ion is in a state of motion from positive to negative to positive.

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