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Which is better, polymer battery or liquid lithium battery?

by:dcfpower     2021-03-23

Due to the differences in the production process and battery raw material formulations of various lithium battery manufacturers, polymer batteries on the market are divided into two different structures: winding type and laminated type (represented by TCL and ATL).

Liquid lithium batteries are just the opposite. The thicker the battery, the better the production. It is difficult to produce batteries with a thickness of less than 4mm. Even if it is produced, the capacity is obviously not as good as polymer lithium batteries, and the cost is not advantageous. Therefore, the thinner the battery, the lower the polymer production cost and the higher the liquid production cost.

In the thicker specifications, the liquid lithium battery pack supply chain is mature, the technology is mature, the production efficiency is high, the yield is high, and it has a strong manufacturing cost advantage. Judging from the current market, although the 5mm and 6mm thickness series liquid lithium batteries have much higher capacity than the 3mm and 4mm thickness series batteries, the price is much lower. Theoretically speaking, the material cost of polymer in 5mm and 6mm thickness specifications is close to that of liquid. However, the current process cost of 5mm and 6mm series batteries is much higher than that of liquid. Therefore, it is necessary to truly compete with liquid in this specification. , There is still a lot of distance.

The specifications adapted to the needs of mobile phones are mostly below 4mm thickness. Compared with liquid, because the outer packaging of polymer battery uses thinner aluminum film, which is thinner than steel shell and aluminum shell, and the production method is different from that of liquid lithium battery pack, the thinner the polymer battery, the better the production. Theoretically, it can produce 0.5 The thickness of the battery below mm.

The main structure of a general battery includes three elements: positive electrode, negative electrode and electrolyte.

The so-called polymer lithium battery pack means that at least one or more of these three main structures use polymer materials as the main battery system. In the polymer lithium-ion battery system currently being developed, polymer materials are mainly used in positive electrodes and electrolytes. The positive electrode material includes conductive polymer or inorganic compounds commonly used in lithium ion batteries, the electrolyte can use solid or colloidal polymer electrolytes, or organic electrolytes, and the negative electrode usually uses lithium metal or lithium-carbon intercalation compounds. Generally, lithium-ion technology uses liquid or colloidal electrolyte, so strong secondary packaging is required to contain combustible active ingredients, which increases weight and cost, and also limits size flexibility. There is no excess electrolyte in the polymer lithium ion process, so it is more stable, and it is not easy to cause dangerous situations due to excessive charging, needle sticks, collisions or other damages, and excessive use of the battery.

The new generation of polymer lithium-ion batteries can be thinner (the thinnest 0.5 mm), any area and any shape in shape, which greatly improves the flexibility of battery shape design, thus It can be made into batteries of any shape and capacity according to product requirements, providing application equipment developers with a high degree of design flexibility and adaptability in power solutions to maximize their product performance. At the same time, the unit energy of polymer lithium-ion batteries is 50% higher than that of current general lithium-ion batteries, and its capacity, charge and discharge characteristics, safety, operating temperature range, cycle life and environmental performance are greater than lithium-ion batteries. The increase in range.

The difference between polymer lithium ion batteries and normal batteries lies in the electrolyte. In the original design in the 1970s, solid polymer electrolytes were used. This type of electrolyte is similar to a plastic film, which cannot conduct electrons but allows ion exchange (atoms or groups of atoms that can be charged). The polymer electrolyte replaces the traditional porous membrane impregnated with electrolyte. The design of the dry polymer electrolyte allows simplified assembly, improved battery mechanical strength, safety, and can be manufactured into an ultra-thin geometric shape. The thickness of a single battery can be as thin as 1mm. Equipment designers can freely design the shape and size of the battery according to their imagination.

As a compromise, some gel electrolytes are introduced. Most of the mobile phone polymer lithium-ion batteries currently on the market are hybrid batteries containing gel electrolyte. Use lithium-ion polymer to modify this system, making it the only polymer power source currently used in portable devices.

After adding gel electrolyte to lithium-ion polymer batteries and general lithium-ion batteries, what is the difference between lithium-ion polymer batteries and general lithium-ion batteries? Although the performance of the two batteries is very similar, the lithium ion polymer as the only solid electrolyte to replace the porous diaphragm gel electrolyte only increases the ionic conductivity. Polymer lithium-ion batteries have not added ionic conductance as some analysts have predicted. Polymer lithium-ion batteries are not as popular as some analysts predicted. Its superiority and low manufacturing cost have not yet been recognized. Because its capacity has not been improved, in fact, the capacity is slightly reduced compared to standard lithium-ion batteries. The market for polymer lithium-ion batteries is in the application of ultra-thin geometric shapes and diverse power supplies, such as credit card power supplies and similar applications.

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