The concept of lithium battery is used very frequently, a little attention, we will find with this concept is actually a broad, narrower and narrower sense of the three distinctions. Lithium batteries in the broad sense include lithium primary batteries and; as lithium-ion batteries are more widely used than lithium primary batteries, so lithium batteries in the narrower sense usually refers to lithium-ion batteries; within the lithium-ion batteries and two classifications: and liquid lithium-ion batteries, because the quality is greater and more applications are liquid lithium-ion batteries, so the narrower understanding of lithium batteries means liquid lithium-ion batteries, and polymer lithium-ion batteries are also called. People are customarily referred to as. If you compare the difference between lithium polymer batteries and lithium batteries in the broad and narrower sense of the meaning, the only thing is the relationship between the species concept and the genus concept, lithium polymer batteries are included in lithium batteries. Therefore, with comparative significance is the comparison on the narrower level: that is, the comparison of polymer batteries and liquid lithium-ion batteries, based on this, the following lithium batteries are used to refer to liquid lithium-ion batteries.
1, the fundamental difference is the raw material
This is the total root of the various different performance 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. Polymer means large molecular weight, and its corresponding concept is small molecules, polymer has high strength, high toughness and high elasticity. Currently developed polymer materials for polymer batteries are mainly used for cathode and electrolyte. ① polymer battery cathode materials in addition to the use of inorganic compounds for lithium batteries, but also conductive polymer polymers; ②, polymer battery electrolytes are polymer electrolyte (solid or gel) and organic electrolyte, lithium batteries use electrolyte (liquid or colloid)
2, shaping differences
Polymer batteries can be thin-shaped, any area and any shape, the reason is that its electrolyte can be solid or colloidal rather than liquid, lithium batteries use electrolyte, which requires a strong shell as a secondary packaging to accommodate the electrolyte. Therefore, this also makes the lithium battery increases part of the weight.
3, safety aspects
The current polymer is mostly soft pack batteries, using aluminum-plastic film as a shell, when the internal use of organic electrolyte, even if the liquid is very hot, it does not explode, because the aluminum-plastic film polymer battery using solid or gel state and no leakage, only natural rupture. But nothing is absolute, if the instantaneous current is large enough to short-circuit, it is not impossible for the battery to spontaneously combust or burst, cell phones and tablet PCs safety accidents caused by this situation.
4、Cell voltage
As polymer batteries use polymer materials, can be made in the cell multi-layer combination to achieve high voltage, while the nominal capacity of lithium battery cells is 3.6V, in order to achieve high voltage in practice, it is necessary to connect multiple cells in series to form the ideal high-voltage working platform.
If you use the above features to compare polymer batteries and lithium batteries which is better, then the conclusion is certain, however, in the market or lithium battery applications dominate, which shows that lithium batteries also have relative advantages, we continue to compare.
5, conductivity
Polymer battery solid electrolyte ionic conductivity is low, at present, mainly by adding some additives to make it a gel electrolyte to improve the conductivity. This also only increases the ionic conductivity, unlike lithium batteries, which maintain a stable value of conductivity without being affected by the quality of auxiliary materials.
6、Capacity
The capacity of polymer battery is not effectively improved, and is reduced compared with the standard capacity of lithium battery.
7、Manufacturing process
The thinner the polymer battery, the better the production, the thicker the lithium battery, which makes the lithium battery in the application of more expandable areas.
8、Price
This is a key factor in determining the market capacity of the two, at present, the market price of polymer batteries are generally higher than lithium batteries, which affects the market capacity of the two, the former to the latter ratio is 1:9.
It is difficult to say absolutely which is better polymer batteries and lithium batteries, they have their own merits, if I have to say a conclusion, the polymer battery in small applications more, and lithium batteries in large applications more promising, if the polymer battery can break through the price and design limitations, perhaps representing the development trend of the battery, because of its environmental protection and safety more in line with the trend.
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