What is the charging and discharging principle of ternary lithium-ion battery? Posted by benzoenergy.com
The full name of the ternary lithium-ion battery is the ternary polymer lithium battery. The ternary polymer lithium battery refers to the lithium battery whose positive electrode material uses nickel-cobalt lithium manganate (Li(NiCoMn)O2) ternary positive electrode material. The ternary composite positive electrode material Precursor products are made of nickel salt, cobalt salt, and manganese salt. The ratio of nickel, cobalt, and manganese can be adjusted according to actual needs. The battery with ternary materials as the positive electrode is safer than lithium cobalt oxide batteries.
1. Charging of ternary lithium-ion battery
The
highest end-of-charge voltage of a single lithium-ion battery is 4.2V,
and it 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. First charge with constant
current until the voltage at both ends of the lithium-ion battery is
4.2V, then switch to constant-voltage charging mode; when the
constant-voltage charging current drops to 100mA , stop charging.
The
charging current (mA) can be 0.1-1.5 times the battery capacity, for
example: for a 1350mAh lithium-ion battery, the charging current can be
controlled between 135mA-2025mA. The conventional charging current can
be selected at about 0.5 times the battery capacity, and the charging
time is about 2 to 3 hours.
2. Discharge of ternary lithium-ion battery
Due to the internal structure of lithium-ion batteries,
all lithium ions cannot move to the positive electrode during
discharge, and a part of lithium ions must be kept at the negative
electrode to ensure that lithium ions can be inserted into the channel
smoothly during the next charge. Otherwise, battery life will be
shortened. In order to ensure that some lithium ions remain in the
graphite layer after discharge, it is necessary to strictly limit the
minimum discharge termination voltage, that is to say, the lithium-ion
battery cannot be over-discharged.
The
end-of-discharge voltage of a single-cell lithium-ion battery is
usually 3.0V, and the minimum cannot be lower than 2.5V. The length of
battery discharge time is related to battery capacity and discharge current.
Battery discharge time (hours) = battery capacity/discharge current,
and the discharge current (mA) of the lithium-ion battery should not
exceed 3 times the battery capacity, for example: for a 1000mAh
lithium-ion battery, the discharge current should be strictly controlled
within 3A, otherwise will damage the battery.
BENZO Energy Technology Co.,Ltd
UFine Technology Co., Ltd
Site: www.bz-battery.com / www.benzoenergy.com
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