Which is better, polymer battery or lithium battery? What is the difference between the two?

The concept of lithium battery is used very frequently. With a little attention, we will find that there are three distinctions between broad sense, narrow sense, and narrow sense when using this concept. Lithium batteries in a broad sense include lithium primary batteries and lithium-ion batteries; more new energy vehicle expertise lies in "super energy engineers", from easy to difficult, from shallow to deep, all-round learning, Weixin shuts down.

Since lithium-ion batteries are more widely used than lithium primary batteries, lithium batteries usually refer to lithium-ion batteries in a narrower sense; there are two types of lithium-ion batteries: polymer lithium-ion batteries and liquid lithium-ion batteries, because of the quality Larger and more applications are liquid lithium-ion batteries, so the narrow understanding of lithium batteries refers to liquid lithium-ion batteries, and polymer lithium-ion batteries are also called lithium polymer batteries, and people are accustomed to abbreviating as polymer batteries.

If you compare the difference between lithium polymer batteries and lithium batteries in a broad and narrow sense, then the only thing is the relationship between species and genus concepts. Lithium polymer batteries are included in lithium batteries. Therefore, what is of more significance is the comparison on the narrow level: that is, the comparison between polymer batteries and liquid lithium-ion batteries. Based on this, the following uses lithium batteries to refer to liquid lithium-ion batteries.

1. The fundamental difference is the raw material

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

2. The difference in shaping

The polymer battery can be thinner, any area, and any shape, because its electrolyte can be solid or colloidal rather than liquid. Lithium batteries use electrolyte, which requires a solid shell as a secondary package to contain the electrolyte. . Therefore, this also makes the lithium battery add a part of the weight.

3. In terms of safety

The current polymer batteries are mostly soft pack batteries, using aluminum plastic film as the outer shell. When the organic electrolyte is used inside, it will not explode even if the liquid is hot. Because the aluminum-plastic film polymer battery adopts a solid or colloidal state without leakage, Naturally rupture. But nothing is absolute. If the instantaneous current is large enough and a short circuit occurs, it is not impossible for the battery to spontaneously ignite or burst. The safety accidents of mobile phones and tablet computers are mostly caused by this situation.

4. Battery voltage

Because the polymer battery uses polymer materials, it can be made into a multi-layer combination in the battery cell to achieve high voltage, and the nominal capacity of the lithium battery cell is 3.6V. If you want to achieve high voltage in actual use, you need to The batteries are connected in series to form an ideal high-voltage working platform.

If you compare polymer batteries and lithium batteries with the above characteristics, the conclusion is certain. However, the application of lithium batteries still dominates the market, which shows that lithium batteries also have relative advantages. We will continue to compare.

5. Conductivity

The ionic conductivity of the solid electrolyte of polymer batteries is low. At present, some additives are mainly added to make it a gel electrolyte to improve the conductivity. This also only increases the ionic conductivity, unlike the conductivity of the lithium battery to maintain a stable value, and will not be affected by the quality of the auxiliary materials.

6. Capacity

The capacity of polymer batteries has not been effectively improved and has been reduced compared with standard-capacity lithium batteries.

7. Manufacturing process

The thinner the polymer battery, the better the production, and the thicker the lithium battery, the better the production, which makes the application of lithium batteries more expandable.

8. Price

This is the key factor that determines the market capacity of the two. At present, the price of polymer batteries on 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 is difficult to say absolutely which is better between polymer batteries and lithium batteries. They have their own merits. If you have to make a conclusion, polymer batteries are more in small applications, while lithium batteries are more promising in large applications. If polymer batteries are The ability to break through the limitations of price and design may represent the development trend of batteries, because its environmental protection and safety are more in line with the trend.