Comparative analysis of polymer battery and liquid lithium battery

Due to the different processing techniques of various manufacturers, the current polymer lithium batteries on the market are divided into two different structures: winding type (represented by Sony and Toshiba) and laminated type (represented by TCL and ATL), but the specifications are adapted to the needs of mobile phones. Most of them are below 4mm thickness. Compared with liquid, because the polymer outer packaging uses a thinner aluminum film, which is thinner than steel shells and aluminum shells, and the processing method is different from that of liquid lithium batteries, the thinner the polymer, the better the processing, and theoretically it can be processed to less than 0.5mm Thickness of the battery. Liquid lithium batteries are just the opposite. The thicker the battery, the better it is to process. A battery with a thickness of less than 4mm is difficult to process. Even if it is processed, the capacity is clearly inferior to polymer lithium batteries, and the cost has no advantage. Therefore, the thinner the battery, the lower the polymer processing cost and the higher the liquid processing cost. But for thicker specifications, the liquid lithium battery supply chain is mature, the technology is mature, the processing efficiency is high, the yield is high, and it has strong manufacturing cost advantages. Judging from the current market, although the liquid lithium batteries of the 5mm and 6mm thickness series 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 important structure of a general battery includes three elements: positive electrode, negative electrode and electrolyte. The so-called polymer lithium battery means that at least one or more of these three critical structures use polymer materials as the critical battery system. In the polymer lithium battery system currently developed, polymer materials are mainly used in the positive electrode and the electrolyte. The positive electrode material includes conductive polymer or inorganic compounds commonly used in lithium 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 adds 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 batteries can be thinner (the thinnest 0.8 mm), any area and any shape in shape, which greatly improves the flexibility of battery shape design, so that it can be made into any shape according to product requirements. The shape and capacity of the battery provide equipment developers with a high degree of design flexibility and adaptability in power processing methods to maximize their product performance. At the same time, the unit energy of polymer lithium battery is 50% higher than the current general lithium battery, and its capacity, charge and discharge characteristics, safety, operating temperature range, cycle life (more than 500 times) and environmental protection performance are all compared with lithium batteries. There is a substantial improvement. The difference between polymer lithium battery and normal battery is 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 can exchange ions (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, improves the mechanical strength of the battery, is safe, 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. Unfortunately, solid-state polymer lithium batteries suffer from their poor electrical conductivity. The internal resistance is too high to supply the high pulse current required by the former communication device, and cannot drive the hard disk of the notebook computer. Heating the battery to 60 degrees Celsius will quickly increase the conductivity, but this requirement is not suitable for use on portable devices. As a compromise, some gel electrolytes were introduced. Most of the lithium polymer batteries for mobile phones 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, what is the difference between lithium ion polymer battery and general lithium battery? Although the performance of these two batteries is very similar, the lithium ion polymer is the only solid electrolyte to replace the porous separator. Gel electrolyte only adds ionic conductivity. Polymer lithium batteries are not as popular as some disintegrators 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 batteries. The market for polymer lithium batteries is in the use of ultra-thin geometry power supplies, such as credit card power supplies. Advantages: Ultra-thin, the battery can be assembled into a credit card. Flexible appearance: Manufacturers are not limited to a standard appearance, and can be economically made into a suitable size. Lightweight: The battery using polymer electrolyte does not require a metal shell as a protective outer packaging. Improved safety: overcharge is more stable, and the probability of electrolyte leakage is lower. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.