Type, Principle and Advantages of Polymer Lithium-ion Battery

Polymer batteries are a type of lithium ion batteries, but compared with liquid lithium batteries, they have many obvious advantages such as high energy density, smaller size, ultra-thinning, lightweight, and high safety and low cost. It is a new type of battery. Polymer batteries are being used in more and more mobile phones and DVDs. Today, the small editor will tell you about the classification, advantages, and principles of polymer lithium-ion batteries.

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Classification of Polymer Lithium-ion Batteries

(1) Solid polymer electrolyte lithium ion battery: The electrolyte is a mixture of polymer and salt. The ion conductivity of this battery at room temperature is low and suitable for high temperature use.

(2) Gel-polymer electrolyte lithium-ion batteries: that is, additives such as plasticizers are added to solid polymer electrolytes to increase ion conductivity and enable batteries to be used at room temperature.

(3) Lithium-ion batteries for polymer cathode materials: The use of conductive polymers as cathode materials has a specific energy of three times that of existing lithium-ion batteries and is the latest generation of lithium-ion batteries.

Advantages of Polymer Lithium-ion Battery

1, good safety performance

The outer packaging is an aluminum plastic packaging, which is different from the metal shell of liquid lithium. Due to the use of soft packaging technology, the internal quality hidden danger can be immediately displayed through the outer packaging deformation. Once there is a safety hazard, it will not explode and will only swell;

2, ultra-thin design

Suitable for a variety of ultra-thin appliances, and liquid lithium-ion batteries have a technical bottleneck when the thickness is less than 3.6 mm.

3, light weight

Polymer lithium is 40 inches lighter than steel shell liquid lithium of the same specification, and 20 inches lighter than aluminum shell liquid lithium;

4, large capacity

Polymers have a lithium capacity of 10-15 inches higher than equivalent steel shells and a lithium capacity of 5-10 inches higher than aluminum shells;

5, small internal resistance

At present, the internal resistance of our products can be made below 35mΩ, so that the battery capacity can be played out more, the same capacity, in some designs, depending on the size of the internal resistance, the use time varies by 20-50 %;

6, shape can be customized

According to the customer's requirements, the thickness and shape of the battery can be flexibly customized, and special shapes such as arcs can be made;

7, good discharge characteristics

Polymer lithium electric uses colloidal electrolyte, with more stable discharge characteristics and higher discharge platform.

Principle of Polymer Lithium-ion Battery

Lithium-ion batteries currently have liquid lithium-ion batteries(LIB) and polymer lithium-ion batteries(PLIB). Among them, liquid lithium-ion batteries refer to secondary batteries where Li + embedded compounds are positive and negative. The positive electrode uses the lithium compound LiCoO2, LiNiO2 or LiMn2O4, and the negative electrode uses the lithium-carbon interlayer compound LixC6. The typical battery system is:

(-) C | LiPF6-EC+DEC | LiCoO2(+)

Positive reaction: LiCoO2 = Li1-xCoO2 + xLi + XE-

Negative reaction: 6C + xLi + XE-= LixC6

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

Polymer lithium-ion batteries have the same principle as liquid lithium, the main difference being that electrolytes are different from liquid lithium. The main structure of the battery includes three elements: positive, negative, and electrolyte. The so-called polymer lithium-ion battery means that at least one or more of these three major structures use polymer materials as the main battery system. In the polymer lithium-ion battery system currently developed, polymer materials are mainly applied to positive poles and electrolytes. Positive materials include conductive polymer polymers or inorganic compounds used in general lithium-ion batteries. Electrolytes can use solid or colloidal polymer electrolytes, or organic electrolytes. Lithium-ion technologies generally use liquids or colloidal electrolytes. Therefore, strong secondary packaging is required to accommodate flammable active ingredients, which increases weight and also limits size flexibility. Polymer lithium-ion processes do not have excess electrolytes, so they are more stable and are not likely to be hazardous due to excessive battery charging, collisions or other damage, as well as excessive use.

The above is the entire content of the classification, advantages, and principles of polymer lithium-ion batteries introduced by the small editor. Polymer lithium-ion batteries theoretically do not have flowing electrolytes, but in the event that an electrolyte leaks and touches the skin, eyes, or other parts of the body, The electrolyte should be washed immediately with water and treated, so everyone should pay special attention when using it so as not to cause harm.

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