A polymer battery is a kind of lithium ion battery, but has many advantages such as high energy density, smaller size, ultra-thinness, light weight, high safety and low cost compared with a liquid lithium battery. New battery. Polymer batteries are being used in more and more mobile phones and mobile DVDs. Today, Xiaobian will talk about the classification, advantages and principles of polymer lithium-ion batteries.
　　 Classification of polymer lithium ion batteries
(1) Solid polymer electrolyte Lithium ion battery: The electrolyte is a mixture of a polymer and a salt, and the battery has low ionic conductivity at normal temperature and is suitable for high temperature use.
(2) Gel polymer electrolyte Lithium ion battery: an additive such as a plasticizer is added to the solid polymer electrolyte to increase the ionic conductivity, so that the battery can be used at normal temperature.
(3) Lithium-ion battery of polymer cathode material: The conductive polymer is used as the cathode material, and its specific energy is three times that of the existing lithium ion battery, and it is the latest generation of lithium ion battery.
　　 Advantages of polymer lithium-ion batteries
　　 1, good safety performance
The outer packaging is aluminum-plastic packaging, which is different from the metal casing of liquid lithium battery. Due to the flexible packaging technology, the internal quality hazard can be immediately displayed through the deformation of the outer packaging. Once a safety hazard occurs, it will not explode and only bulge;
　　 2, ultra-thin design
Suitable for all kinds of ultra-thin appliances, and liquid lithium-ion batteries have technical bottlenecks when the thickness is below 3.6mm.
　　 3, light weight
The polymer lithium battery is 40% lighter than the equivalent specification of the steel shell liquid lithium, and 20% lighter than the aluminum shell liquid lithium;
　　 4, large capacity
The polymer has a capacity of 10-15% higher than that of the same specification of the steel shell liquid lithium, and 5-10% higher than the aluminum shell liquid lithium capacity;
　　 5, the internal resistance is small
At present, the internal resistance of our products can be made below 35mΩ, so that the battery capacity can be more exerted, the same capacity, in some designs, due to different internal resistance, the use time is 20-50%;
　　 6, the shape can be customized
The thickness and shape of the battery can be flexibly customized according to the requirements of the customer, and special shapes such as curved shapes can be made;
　 7, good discharge characteristics
The polymer lithium battery uses a colloidal electrolyte with smoother discharge characteristics and a higher discharge platform.
　　 Principle of polymer lithium ion battery
Lithium-ion batteries currently have two types of liquid lithium-ion batteries (LIB) and polymer lithium-ion batteries (PLIB). 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: LiCoO2=Li1-xCoO2+xLi++xe-
Negative reaction: 6C+xLi++xe-=LixC6
Total battery reaction: LiCoO2+6C=Li1-xCoO2+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. The polymer lithium ion process does not have excess electrolyte, so it is more stable, and it is not easy to cause dangerous situations due to overcharging, collision or other damage of the battery, and excessive use.
The above is the whole content of the classification, advantages and principles of polymer lithium-ion batteries introduced by Xiaobian. The polymer lithium-ion battery theoretically does not have a flowing electrolyte, but in case of electrolyte leakage, it comes into contact with the skin. Eyes or other parts of the body should immediately rinse the electrolyte with water and seek medical attention, so you should pay special attention when using it to avoid injury.
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