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LiFePO4 Battery and Lithium Polymer Battery

The working principle of LiFePO4 battery:

LiFePO4 battery refers to a lithium ion battery using LiFePO4 as a positive electrode material. The cathode materials of lithium-ion batteries mainly include lithium cobalt oxide, lithium manganate, lithium nickel oxide, ternary materials, LiFePO4, etc. Among them, lithium cobalt oxide is the cathode material used in the vast majority of lithium-ion batteries.

LiFePO4 battery refers to a lithium ion battery using LiFePO4 as a positive electrode material. The cycle life of long-life lead-acid batteries is about 300 times, and the maximum is 500 times of LiFePO4 batteries, while the cycle life of LiFePO4 power batteries can reach more than 2500 times, and the standard charging (5-hour rate) can reach 2500 times.

The lead-acid battery of the same quality is “new half year, old half year, and maintenance and maintenance for half a year”, which is 1 to 1.5 years at most, while LiFePO4 battery will reach 7 to 8 years when used under the same conditions. Taken together, the price-performance ratio will be more than 4 times that of lead-acid batteries.

Our products use LiFePO4 batteries. The LiFePO4 solar power station is more stable. The LiFePO4 battery provides our portable power station with 2500+ cycles and a battery life of more than ten years.

LiFePO4 solar power station

The principle of polymer lithium battery:

Lithium-ion batteries currently have two types: 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 the positive and negative electrodes. The positive electrode adopts lithium compound LiCoO2, LiNiO2 or LiMn2O4, and the negative electrode adopts lithium-carbon interlayer compound LixC6. The typical battery system is:

typical battery system
typical battery system

The principle of 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 polymer materials as the main battery system. In the currently developed polymer lithium-ion battery systems, polymer materials are mainly used in positive electrodes and electrolytes.

The positive electrode material includes conductive polymers or inorganic compounds commonly used in lithium-ion batteries. The electrolyte can use solid or colloidal polymer electrolytes, or organic electrolytes. Generally, lithium-ion technology uses liquid or colloidal electrolytes. Therefore, it is necessary to Rugged secondary packaging to contain flammable active ingredients adds weight and additionally limits dimensional flexibility.

The new generation of polymer lithium-ion batteries can be thinned in shape (the thinnest ATL battery can reach 0.5 mm, which is equivalent to the thickness of a card), arbitrary area and arbitrary shape, which greatly improves the battery design. Flexibility, so that it can be made into batteries of any shape and capacity according to product requirements, providing equipment developers with some design flexibility and adaptability in power solutions to maximize the performance of their products. At the same time, the unit energy of the polymer lithium-ion battery is 20% higher than that of the current general lithium-ion battery, and its capacity and environmental performance are improved compared to the lithium-ion battery.

Lithium polymer battery (Li-polymer) is produced by replacing traditional liquid organic electrolyte with polymer electrolyte on the basis of lithium ion battery. This polymer electrolyte can be used as a medium for conducting ions and as a separator. In addition, the reactivity with lithium metal is extremely low, so it can effectively avoid the easy combustion and easy leakage of lithium ion batteries.

And because the lithium-ion polymer battery adsorbs a liquid organic electrolyte on a polymer matrix, called a colloidal electrolyte, this electrolyte is neither a free electrolyte nor a solid electrolyte, so that the lithium-ion polymer battery not only has the advantages of The excellent performance of liquid lithium-ion batteries can also be made into ultra-thin products of any shape and size, making it a wide range of applications and good development prospects. In addition, the safety is better than that of lithium-ion batteries. If it heats up during use, it will only swell or burn rather than explode.

In addition, the polymer lithium battery (3.7v) is light in weight and has a higher voltage than LiFePO4 (3.2v). The high temperature resistance coefficient is lower than that of LiFePO4.

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