Lithium battery self-discharge
Lithium battery
self-discharge is a battery voltage drop in the circuit can be replaced, in
ternary lithium, lithium cobalt oxide, manganese oxide material electrode, lithium
battery self-discharge phenomenon was inevitable.
Lithium-ion
battery self-discharge capacity loss according to whether or not reversible is
divided into two: the capacity loss reversible refers to the second battery
capacity can be restored; irreversible capacity loss, capacity cannot be
recovered. The factors affecting the level of self-discharge: cathode and cell
preparation process, nature and concentration of the electrolyte, the battery
storage temperature and storage time, among them, the temperature dependence is
relatively large.
Lithium-ion batteries
self-discharge, loss of capacity and much of it can be recovered, following a
case of lithium manganese oxide to analyze the reasons behind this phenomenon.
Speaking from the
mechanism, fully charged lithium ion battery self-discharge is due to
the decomposition of the electrolyte response and caused the initial
interrelation reaction of lithium, it is not reversible, which is reversible.
Furthermore,
lithium in the anode and cathode of the embed and removal of block was able to
recover, because the electrode at the same rate of self-discharge, which
implies a capacity balancing mechanism, but long after discharge, two
electrodes of capacity balance will be broken, and then charge deposition of carbon
anode for lithium in danger, causing volume cannot be recovered.
Self-discharge can
be represented by lithium-ion batteries self-discharge rate, however, the
self-discharge rate is uncertain. In mechanism, main is by electrolytic quality
solvent of oxidation rate control of, solvent oxidation main occurred in carbon
black surface, low surface area of carbon black can control since discharge
rate, for manganese acid lithium battery,, reduced activity material of surface
area, and delay solvent in set fluid of oxidation is important of, above is in
lithium battery preparation process in the caused different since discharge
rate of roots.
Lithium battery
self-discharges as well as the influence of external factors. One is the effect
of storage time, as mentioned above, the longer, the capacity of the li ion
battery between anode and cathode balance will be gradually
broken and deepening, and decomposition of the electrolyte will also accumulate
some irreversible capacity loss. Thus, longer storage time, self-discharge rate
will increase.
Lithium-ion
battery's self-discharge rate is negligible relative to other types of
batteries, which is determined by the structure of lithium-ion batteries.
Therefore, for the lithium-ion battery self-discharge capacity loss of
expression is generally one month calculated. Typically, lithium-ion batteries
at room temperature of the month self discharge rate of 3%, but if you do not
pay attention to the environment is likely to accelerate, as in 55℃ high temperature self discharge rate of
10%, it was room temperature 3 times, Although discharge caused part capacity
can be restored, but the self-discharge rate is staggering under high
temperature, long-term in inappropriate temperatures, will have much impact on
ultimate lithium battery life.
Contact:
Person: Tim.lee
Company: Dongguan
Large Electronics Co., Ltd
Add: Block A,
Gaosheng Technology Zone, Nancheng District, Dongguan City, Guangdong Province,
CN
Tel:
86-769-23182621
Email:
Tim.lee@largepower.cn
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