Lithium batteries in a broad sense include lithium primary batteries and lithium-ion batteries; because 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 li ion battery types: Polymer lithium-ion batteries and liquid lithium-ion batteries are liquid lithium-ion batteries with greater mass and more applications, so the narrow understanding of lithium batteries refers to liquid lithium-ion batteries, and polymer lithium-ion batteries are also called lithium polymers. Batteries are commonly referred to as polymer batteries for short.
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 lithium polymer batteries and liquid lithium ion batteries. Based on this, the following uses lithium batteries to refer to liquid lithium ion batteries.
This is the total source of the different performances of the two. Lithium 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. Macromolecules mean large molecular weights, and the corresponding concept is small molecules. Macromolecules have 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 cathode material of the lithium polymer battery can also be a conductive polymer;
②The electrolytes of lithium polymer batteries include polymer electrolytes (solid or colloidal) and organic electrolytes, and lithium polymer batteries use electrolytes (liquid or colloidal).
Lithium polymer batteries can be thinner, arbitrarily shaped, and arbitrarily shaped, because the electrolyte can be solid or colloidal rather than liquid. Lithium polymer batteries use electrolyte and require a solid shell as a secondary packaging. Hold the electrolyte. Therefore, this also makes the lithium battery add a part of the weight.
The current lithium 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 very hot, because the aluminum plastic film polymer battery adopts solid or colloidal state without leakage, it just broke naturally. 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.
Because the lithium polymer battery uses polymer materials, it can be made into a multilayer combination in the battery to achieve high voltage, and the nominal voltage of the lithium battery cell is 3.7 V lithium ion battery. If you want to achieve high voltage in actual use, it is necessary to connect multiple cells in series to form an ideal high-voltage working platform.
The ionic conductivity of the solid electrolyte of lithium polymer batteries is low. At present, some additives are mainly added to make it a gel electrolyte to improve the conductivity. This only increases the ionic conductivity, unlike the conductivity of lithium batteries that maintain a stable value, and will not be affected by the quality of the auxiliary materials.