Which is better between Lithium battery and polymer battery？

Lithium batteries classify into liquid lithium batteries and polymer lithium batteries. Lithium polymer batteries are upgraded products of lithium ion batteries. Compared with current popular lithium-ion battery, it has advantages of large capacity, small size (thin), and safety (no explosion).

Of course, the polymer battery is better! It is also a kind of lithium ion battery, but it has high energy density and high safety compared with liquid lithium battery (Li-ion).

Accurate: Lithium polymer battery; Lithium ion battery can divided into liquid lithium ion battery and polymer lithium ion battery according to the different electrolyte materials used in lithium ion batteries. Therefore, the "lithium ion battery" written in the manual is also correct.

Lithium polymer battery is an upgraded product of lithium ion battery. Compared with the current popular lithium ion battery, it has the advantages of large capacity, small size (thin), safety (no explosion), etc. However, due to the entire industrial chain it takes a certain amount of time to replace it. Its cost (cost) is still relatively high, and it only used in high-end digital products (ultra-thin notebook computers, etc.).

It is foreseeable that in the next 5-10 years, lithium polymer batteries will replace the existing lithium-ion batteries! In fact, the popularity of lithium polymer batteries in countries such as Japan and South Korea, which are more developed in the electronics industry, has reached A certain level, but China is still relatively backward in this respect, let us wait and see! Waiting for future, use of lithium polymer battery mobile phones is cheap; I must replace this more secure mobile phone (battery)!

Lithium polymer battery (Li-polymer, also known as polymer lithium battery): It has a variety of obvious advantages such as high energy density, smaller size, ultra-thinness, light weight, high safety and low cost. Battery. In shape, lithium polymer battery has ultra-thin characteristics, which made into batteries of any shape and capacity according to the needs of various products. The minimum thickness of this type of battery can reach 0.5mm. Compared with lithium ion. The characteristics of the battery, lithium polymer battery are as follows:

1. No battery leakage problem, the battery does not contain liquid electrolyte inside, use colloidal solid.

2. Can make into a thin battery: with a capacity of 3.6V400mAh, its thickness can be as thin as 0.5mm.

3. The battery can design in a variety of shapes.

4. The battery can bent: the polymer battery can bent up to about 90°.

5. A single high-voltage: liquid electrolyte battery can only connect in series with several batteries to obtain a high voltage, and the polymer battery can made into a multi-layer combination in a single piece to achieve a high voltage because it has no liquid.

6. The capacity will be twice as high as the same size lithium-ion battery.

Lithium-ion batteries classified into Lithified Lithium-Ion Battery (LIB) and Polymer Lithium-Ion Battery (PLB) or plastic lithium according to the electrolyte materials used in lithium-ion batteries. Plasma lithium ion batteries (PLB for short). The positive and negative materials used in polymer lithium-ion battery are the same as the liquid lithium ions. The positive electrode material divided into lithium cobaltite, lithium manganite, ternary material and lithium-iron phosphate material, and the negative electrode is graphite. The working principle of the battery is also 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.

Solid

The solid polymer electrolyte lithium-ion battery electrolyte is a mixture of a polymer and a salt, and the battery has high ionic conductivity at normal temperature and can use at normal temperature.

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 use at normal temperature.

Polymer

Since solid electrolyte instead of liquid electrolyte, polymer lithium ion battery has advantages of being thinner, arbitrarily area, and arbitrarily shaped compared with the liquid lithium ion battery. So that battery casing can 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 it is very specific energy will be increased by more than 20% compared with the current liquid lithium ion battery. The polymer lithium ion (Polymer Lithium-Ion Battery) battery characterized by miniaturization, thinning, and weight reduction. Therefore, the market share of polymer batteries will gradually increase.

Polymer lithium-ion batteries have the following characteristics [1]:

1. Shaping flexibility;

2. Higher mass specific energy (3 times the 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.

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 intercalation 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, the polymer material mainly applied to 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 may 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.

A new generation of polymer lithium-ion batteries can thin in shape (ATL batteries can be as thin as 0.5 mm, compared to thickness of a card). Flexible on sharp and shaped could greatly improving battery design. This flexibility could match product requirements and make battery in any shape and capacity. It provides device developers with some design flexibility and adaptability in power solutions to maximize their product performance. At the same time, unit energy of polymer lithium-ion battery is 20% higher than current general lithium ion battery, its capacity and environmental performance are better than those of lithium ion battery are.

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