What's the difference between polymer batteries and lithium batteries?

The concept of lithium batteries is very frequently used. With a little attention, we will find that the concept of using lithium is divided into three broad categories: generalized, narrower and narrower. Lithium batteries in a broad sense include lithium primary batteries and lithium ion batteries ; since lithium ion batteries are more widely used than lithium primary batteries, lithium batteries generally refer to lithium ion batteries in a narrower sense; there are two types of lithium ion batteries inside: Polymer lithium-ion batteries and liquid lithium-ion batteries, because of the larger mass and more liquid lithium-ion batteries, the narrow understanding of lithium batteries refers to liquid lithium-ion batteries, while polymer lithium-ion batteries are also called lithium polymers. people used to be referred to as polymer batteries . If the difference between a lithium polymer battery and a lithium battery is compared in a broad sense and a narrow sense, then the only relationship between the concept and the concept is that the lithium polymer battery is included in the lithium battery. Therefore, what is more meaningful is the comparison on the narrow level: the comparison between the polymer battery and the liquid lithium ion battery. Based on this, the following lithium battery refers to the liquid lithium ion battery.

1. The fundamental difference is raw materials

This is the total source of the different performances of the two. The polymer battery means that at least one of the three components of the positive electrode, the negative electrode or the electrolyte is a polymer material. Polymer means that the molecular weight is large, and the corresponding concept is a small molecule, and the polymer has high strength, high toughness and high elasticity. The polymer battery materials currently developed are mainly used for the positive electrode and the electrolyte. 1 Polymer battery cathode material In addition to the inorganic compound of lithium battery, conductive polymer can also be used; 2. Polymer electrolyte has polymer electrolyte (solid or colloidal) and organic electrolyte, lithium battery uses electrolyte (liquid or colloid)

2, shape difference

Polymer batteries can be thinned, arbitrarily area and arbitrarily shaped because their electrolytes can be solid-state colloidal rather than liquid, lithium batteries use electrolytes, and require a strong outer casing to hold the electrolyte as a secondary package. . Therefore, this also adds a part of the weight of the lithium battery.

3. Security aspects

Most of the current polymers are soft-packed batteries, which are made of aluminum-plastic film. When the organic electrolyte is used inside, even if the liquid is very hot, it will not explode because the aluminum-plastic film polymer battery adopts solid or colloidal state without leakage. It is naturally broken. But nothing is absolute. If the instantaneous current is large enough and a short circuit occurs, it is not impossible for the battery to ignite or burst. The occurrence of safety accidents on mobile phones and tablets is caused by this situation.

4, battery voltage

Since the polymer battery is made of a polymer material, it can be made into a multi-layer combination in the battery cell to achieve a high voltage, and the lithium battery cell has a nominal capacity of 3.6V. To achieve a high voltage in practical use, it is necessary to The cells are connected in series to form the ideal high voltage working platform.

If you compare the polymer battery and the lithium battery with the above characteristics, then the conclusion is certain. However, the application of lithium battery in the market is dominant, which indicates that the lithium battery also has a comparative advantage, and we continue to compare.

5, conductivity

The solid electrolyte of the polymer battery has low ionic conductivity, and currently some additives are added to make it a gel electrolyte to improve the conductivity. This also increases the ionic conductance, which does not maintain a stable value for the conductivity of the lithium battery, and is not affected by the quality of the auxiliary material.

6, capacity

The capacity of polymer batteries has not been effectively improved, and it has been reduced compared to standard capacity lithium batteries.

7, the manufacturing process

The thinner the polymer battery, the better the production is. The thicker the lithium battery, the better the production is, which makes the lithium battery more expandable in the field of application.

8, the price

This is a key factor in determining the market capacity of the two markets. At present, the price of polymer batteries in the market is generally higher than that of lithium batteries, which affects the market capacity of the two. The ratio of the former to the latter is 1:9.

It's hard to say absolutely whether polymer batteries and lithium batteries are good. They have their own merits. If you have to make a conclusion, polymer batteries will be more used in small applications, and lithium batteries are more promising in large-scale applications, if polymer batteries Being able to break through the limitations of price and design may represent a battery development trend, as its environmental protection and safety are more in line with the trend.