What is the difference between polymer lithium batteries and liquid lithium batteries?

Lithium batteries can be divided into two types: polymer lithium batteries and liquid lithium batteries. What is the difference between the two? Today I will answer you:

It can be directly identified from the appearance that the polymer lithium battery is not protected by an iron shell and has a certain degree of softness. Liquid lithium batteries usually have a hard case protection, such as 18650 lithium batteries on the market.

Both work the same way. The charging and discharging of lithium ions are achieved through the intercalation and deintercalation processes of lithium ions. During this process, lithium ions are inserted into the negative electrode for charging, and deintercalated from the negative electrode for discharge.

The main differences between liquid lithium-ion batteries and polymer lithium-ion batteries are as follows:

1. Material differences: In polymer lithium batteries, at least one of the positive electrode, negative electrode and electrolyte is made of polymer materials, such as polyacrylic acid and polymethacrylic acid in the electrolyte.

2. Different electrolyte forms: liquid lithium-ion batteries mostly use liquid organic solvents + conductive salts, while polymer lithium batteries use colloid/solid.

A brief comparison of polymer lithium batteries and liquid lithium batteries:

1. Energy density: The greater the energy density, the greater the capacity per unit volume. By improving the material/thickness of the anode (anode) and diaphragm, the energy density of polymer lithium batteries can reach 600Wh/L+.

2. The degree of customization: the shape of the polymer lithium battery is easier to thin, and it is easier to make various shapes without using a metal protective case.

3. Weight: Liquid lithium batteries are heavier, while polymer lithium batteries are lighter and have the same volume.

4. Safety: In extreme cases (such as overcharge/high temperature), a serious chemical reaction will occur inside the lithium battery, resulting in a large amount of gas. At this time, the liquid lithium battery will explode and rupture when the internal pressure is quite large due to the wrapped metal shell. , and the polymer lithium battery will expand or burst as long as the internal pressure is slightly higher due to the use of aluminum film packaging (or plastic casing), and will not cause an explosion. But be warned, both of them can burn in extreme conditions.

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