What is the difference between a liquid lithium battery and a lithium polymer battery?

Guide: Mobile phone lithium battery everyone listens a lot, but how is this thing classified? (The following lithium-ion battery is abbreviated as lithium battery) In fact, in the field of electronic products, lithium batteries are commonly used in liquid lithium-ion batteries and polymer lithium ions.

Mobile phone lithium battery everyone listens a lot, but how is this thing classified? (The following lithium-ion battery is abbreviated as lithium battery) In fact, in the field of electronic products, lithium batteries are commonly used in liquid lithium-ion batteries and polymer lithium ions.

*(18650 is a battery with a diameter of 18mm and a length of 65mm, a cylindrical battery. Although most of the 18650 on the market is liquid lithium battery, any statement that "polymer lithium battery is safer than 18650" is wrong. )

What are the different?

First of all, it should be noted that the working principle of the two is the same. The charging and discharging are realized by the process of lithium ion intercalation and deintercalation. Lithium ions are embedded in the negative electrode for charging, and lithium ions are deintercalated from the negative electrode to discharge.

Mobile phone lithium battery knowledge: first look at the bombing

As can be seen from the above figure, the lithium battery contains three basic elements: the positive electrode, the negative electrode, and the electrolyte (the substance filled between the two stages). Of course, there is a diaphragm that prevents direct contact between the positive and negative electrodes (of course, lithium ion). It can pass smoothly, the diaphragm is not good, it will cause a short circuit and cause an explosion~~)

The main difference between a liquid lithium-ion battery and a polymer lithium-ion battery is

1. Differences in materials: In the polymer lithium battery, at least one of the above three basic elements must be made of a polymer material, such as an electrolyte solution, which is replaced with polystyrene, polymethacrylic acid, and the like.

2. Differences in electrolyte morphology: Liquid lithium-ion batteries mostly use liquid organic solvents + conductive salts, while polymer lithium batteries replace these electrolytes with colloids/solids (see the battery type for specific components).

Are they each arrogant?

Simple comparison of polymer lithium battery / liquid lithium battery

Polymer lithium battery liquid lithium energy density (Wh / L) > 300200 ~ 280 can be customized (shape) flexible and difficult to light weight (no need for metal protective shell) heavier (requires metal protective shell) safety and safety is safer than costly

1. Energy density: The greater the energy density, the more capacity a unit volume can have. The polymer lithium battery has improved the material/thickness of the negative electrode (anode), separator, etc., and the energy density has now reached 600 Wh/L+.

2. Customizable degree: Polymer lithium battery is easier to be thinner and lighter in shape, and it is easier to customize into various shapes without wrapping with a metal protective case.

3. Weight: It has been indicated on the form.

4. Safety: In extreme cases (such as overcharge/high temperature), lithium batteries will undergo intense chemical reactions inside, generating a large amount of gas. At this time, liquid lithium batteries are wrapped by metal shells. When the internal pressure is quite large, the outer casing will be A rupture explosion occurs, and the polymer lithium battery is wrapped (or a plastic case) by using only a packaged aluminum film, and as long as the internal pressure is slightly higher, it will expand or rupture without causing an explosion. However, it should be noted that both liquid lithium and polymer lithium can be burned under extreme conditions.

5. Cost: In addition to higher material lithium battery power than liquid lithium battery, due to the higher degree of customizable polymer lithium battery, more costs will be incurred in the design and manufacturing process, such as various customized Fixtures, test equipment, etc., result in higher cost of polymer lithium battery than shape standard/regular liquid lithium battery.

How do you divide your mobile phone into liquid lithium or polymer lithium?

In order to be thin and light, for the capacity, the current mobile phone uses a polymer lithium-ion battery, whether it is the soft bag of the iPhone or the previous Nokia with a plastic hard shell, are all polymer lithium-ion batteries.

Mobile phone lithium battery knowledge: first look at the bombing

Where can I find a liquid lithium-ion battery?

Take apart your heavy and thick laptop battery, or remove your dad's large toy car (Tesla)

How to use polymer lithium battery (mobile phone) in peacetime?

In fact, how to protect polymer lithium battery is relatively simple, we only need not put the phone in high temperature, high humidity, and avoid using it in the sun exposure environment.

In addition, the lithium battery should not be overcharged, because the polymer lithium battery in the mobile phone has protection board protection, it will automatically power off after being fully charged, so there is no danger of overcharging (the protection board is broken), and the mobile phone is used. It is best not to fully charge the battery before charging, otherwise it will easily damage the active material of the battery poles, resulting in significant attenuation of battery capacity.

Mobile phone lithium battery knowledge: first look at the bombing

How to activate the newly purchased polymer lithium battery (mobile phone)?

The new polymer lithium battery (mobile phone) can be activated as long as it is normally charged and discharged 3 to 5 times. It does not need to be charged for 12 hours. Because there is no memory effect in the polymer lithium battery, the saying that "the new mobile phone is bought back for 12 hours" is only for the former. Nickel-cadmium and nickel-hydrogen batteries are effective. Moreover, there is protection of the protection board. When the battery is fully charged, the charging circuit is disconnected. The charger is plugged in, and the power cannot reach the battery.

Polymer lithium battery is not used for a long time (mobile phone is idle for a long time), how to protect it?

If lithium battery (mobile phone) is not used for a long time, it is best to keep the battery capacity of about 50% to avoid the voltage being too low due to self-discharge of lithium battery, destroying the active material of the two poles, resulting in capacity loss. In addition, it should be placed in a dry, cool place, because the self-discharge rate of lithium battery in the high temperature, high humidity environment will be faster.

Re-activate after 3~5 times of normal charge and discharge.

The page contains the contents of the machine translation.