What is a polymer lithium battery

What is a polymer lithium battery
The so-called polymer lithium battery refers to a lithium-ion battery that uses a polymer as an electrolyte. Specifically, it is divided into two types: "semi-polymer" and "full polymer".
"Semi-polymer" refers to coating a layer of polymer (usually PVDF) on the separator, so that the adhesion of the battery cell is stronger, the battery can be made harder, and the electrolyte is still a liquid electrolyte. And "full polymer" refers to the use of polymers to form a gel network inside the cell, and then inject electrolyte to form an electrolyte. Although "full polymer" batteries still use liquid electrolyte, the amount is much smaller, which is harmful to lithium batteries. The safety performance of ion batteries has been greatly improved. As far as the author knows, only SONY is mass-producing "all polymer" lithium-ion batteries.
On the other hand, polymer batteries refer to lithium-ion batteries that use aluminum-plastic packaging film as the outer packaging, which is commonly known as soft-pack batteries. This packaging film is composed of three layers, which are PP layer, AI layer and nylon layer. Since PP and nylon are polymers, this battery cell is called a polymer battery.