Many people know the name of polymer lithium battery, but what about this battery? Today, polymer lithium battery suppliers will explain this polymer lithium battery in detail.

Lithium-ion batteries are classified into liquid lithium ion batteries and polymer lithium ion batteries or plastic lithium ion batteries according to the electrolyte materials used in lithium ion batteries. 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.

classification

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.

The gel-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.

Since the polymer replaces the liquid electrolyte with a solid 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 can be made of the aluminum-plastic composite film. Therefore, the specific capacity of the entire battery can be improved; the polymer lithium ion battery can also use a polymer as a positive electrode material, and its mass specific energy will be increased by more than 20% compared with the current liquid lithium ion battery. The polymer lithium ion (PolymerLithium-IonBattery) battery is characterized by being compact, thin, and lightweight. Therefore, the market share of polymer batteries will gradually increase.

Polymer lithium ion batteries have the following characteristics:

1 shape flexibility; 2 higher mass specific energy (3 times MH-Ni battery); 3 electrochemical stability window width, up to 5V; 4 perfect safety and reliability; 5 longer cycle life, less capacity loss ; 6 volume utilization is high;

Principle of polymer lithium battery

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 typical battery system is:

(-)C|LiPF6—EC+DEC|LiCoO2(+)

Positive electrode reaction (reduction reaction): Li1-xCoO2+xLi++xe-=LiCoO2-----------(2.1)

Negative electrode reaction (oxidation reaction): LixC6-xe-=6C+xLi+-----------(2.2)

Total battery reaction: Li1-xCoO2+LixC6=LiCoO2+6C-----------(2.3)

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.