What is the reason why the voltage drops rapidly in lithium batteries?

    The voltage of lithium batteries drops rapidly, mainly for the following reasons:

    The micro short circuits inside the battery, side reactions of the electrode materials, and reactions between the electrode materials may lead to a large voltage drop in the battery during storage (especially at high temperatures of 60°C), that is, the battery's self-discharge is greater.

一. Micro short circuit inside the battery

The following reasons may cause micro-short circuits in the battery:

1. The burrs of the current collector pierce the diaphragm;

2. The amount of adhesive is insufficient or the powder material is poorly wetted, resulting in insufficient bonding between the coating and the current collector, and the coating peels off and pierces the diaphragm;

3. There is a large particle powder in the slurry, which causes the diaphragm to rupture after the battery is vacuumed;

4. The width of the diaphragm is improperly designed.

二. Side reaction of battery materials

    Battery materials (including electrolytes) may have side reactions other than normal electrochemical reactions at high temperatures.

三. Chemical reaction between battery materials

At high temperatures and certain voltages, additional chemical reactions may occur between the battery materials.

四. Battery material

    No matter what active materials, conductive agents, electrolytes and adhesives are used, if the above hidden dangers are present, there may be a problem of excessive voltage drop during battery storage.Under normal circumstances, LA-type water-based adhesive will not cause the problem of excessive voltage drop during battery storage, i.e. LA-type water-based adhesive material

The body will not have a large self-discharge.

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