What is the classification and principle of polymer lithium batteries?

Lithium-ion batteries are classified into Lithified Lithium-Ion Battery (LIB) and Polymer Lithium-Ion Battery (PLB) or Plastic lithium ion battery (Plastic lithium ion batteries) , referred to as PLB. The positive and negative materials used in the polymer lithium ion battery are the same as the liquid lithium ions. The positive electrode material is divided into lithium cobaltate, lithium manganate, ternary material and lithium iron phosphate material, and the negative electrode is graphite. The working principle of the battery is also basically consistent. The main difference is that the electrolyte is different. The liquid lithium ion battery uses a liquid electrolyte, and the polymer lithium ion battery is replaced by a solid polymer electrolyte. The polymer can be either "dry" or "colloidal". Most of the current polymer gel electrolytes are used.

Polymer lithium battery classification:

Solid:

The solid polymer electrolyte lithium ion battery electrolyte is a mixture of a polymer and a salt. The battery has high ionic conductivity at normal temperature and can be used at normal temperature.

Gel:

The gel polymer electrolyte lithium ion battery adds an additive such as a plasticizer to the solid polymer electrolyte to increase the ionic conductivity and allow the battery to be used at normal temperature.

Polymer:

Since the solid electrolyte is used instead of the liquid electrolyte, the polymer lithium ion battery has the advantages of being thinner, arbitrarily aread and arbitrarily shaped compared with the liquid lithium ion battery, so that the battery casing can be fabricated from the aluminum-plastic composite film, thereby It can improve the specific capacity of the whole battery; the polymer lithium ion battery can also use the polymer as the positive electrode material, and its mass specific energy will be more than 20% higher than the current liquid lithium ion battery. The polymer lithium ion (Polymer Lithium-Ion Battery) battery is characterized by being compact, thin, and lightweight. Therefore, the market share of polymer batteries will gradually increase.

Principle of polymer lithium battery:

Lithium-ion batteries currently have two types of liquid lithium-ion batteries (LIB) and polymer lithium-ion batteries (PLB). Among them, the liquid lithium ion battery refers to a secondary battery in which the Li+ intercalation compound is a positive electrode or a negative electrode. The positive electrode is made of lithium compound LiCoO2, LiNiO2 or LiMn2O4, and the negative electrode is made of lithium-carbon interlayer compound LixC6.

The principle of a polymer lithium ion battery is the same as that of liquid lithium. The main difference is that the electrolyte is different from liquid lithium. The main structure of the battery includes three elements: positive electrode, negative electrode and electrolyte. The so-called polymer lithium ion battery means that at least one or more of the three main structures use a polymer material as a main battery system. In the polymer lithium ion battery system currently developed, polymer materials are mainly used for the positive electrode and the electrolyte. The positive electrode material includes a conductive high molecular polymer or an inorganic compound used in a general lithium ion battery, and the electrolyte can use a solid or colloidal polymer electrolyte or an organic electrolyte. Generally, a lithium ion technique uses a liquid or a colloidal electrolyte, so it is required the sturdy secondary package accommodates flammable active ingredients, which adds weight and limits size flexibility.

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