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The difference between polymer lithium battery and lithium battery


The difference between polymer lithium battery and lithium battery

The so-called polymer lithium battery refers to a lithium ion battery that uses a polymer as an electrolyte, which is divided into two types: "semi-polymer" and "full polymer".

"Semi-polymer" refers to coating a layer of polymer (usually PVDF) on the barrier film, which makes the adhesion of the cell stronger, the battery can be made harder, and the electrolyte is still a liquid electrolyte. And "all-polymer" refers to the use of polymer to form a gel network inside the cell, and then inject the electrolyte to form the electrolyte. Although "all-polymer" batteries still use liquid electrolyte, the amount is much less, which greatly improves the safety performance of lithium-ion batteries. As far as I know, only SONY is mass-producing "all-polymer" lithium-ion batteries.

On the other hand, polymer batteries refer to lithium-ion batteries that use aluminum-plastic packaging films as outer packaging, which are commonly known as soft-pack batteries. This packaging film consists of three layers, namely PP layer, Al layer and nylon layer. Because PP and nylon are polymers, this kind of battery is called a polymer battery.

The difference between polymer lithium battery and lithium battery

1. The raw materials are different. The raw materials of lithium ion batteries are electrolytes (liquid or colloid); the raw materials of polymer lithium batteries are electrolytes, including polymer electrolytes (solid or colloidal) and organic electrolytes.

2. Different in terms of safety, lithium-ion batteries can be easily blasted in a high temperature and high pressure environment; polymer lithium batteries use aluminum-plastic film as the shell, and when organic electrolytes are used inside, even if the liquid is very hot, it will not explode.

3. Different shapes, polymer batteries can be thin, arbitrary area and arbitrary shape, the reason is that its electrolyte can be solid or colloidal instead of liquid, and lithium batteries use electrolyte, which requires a solid shell as The secondary packaging contains the electrolyte.

4. The cell voltage is different, because the polymer battery is made of polymer materials, it can be made into a multi-layer combination in the cell to achieve high voltage, while the nominal capacity of the lithium battery cell is 3.6V, in order to achieve high voltage in practical application If the voltage is high, multiple cells need to be connected in series to form an ideal high-voltage operating platform.

5. The production process is different. The thinner the polymer battery, the better the production, and the thicker the lithium battery, the better the production. This allows the lithium battery to be applied in more fields.

6. Capacity, the capacity of polymer batteries has not been effectively improved, and it has been reduced compared with lithium batteries with standard capacity.

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