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Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .
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Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc
Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.
Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc
Guizhou STD Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production & sale of lithium polymer batteries, drone battery, airplane batteries & battery pack etc.
release time:2023-11-28 Hits: Popular:AG11 battery
Lithium iron phosphate battery is a lithium-ion battery that uses lithium iron phosphate (LiFePO4) as the positive electrode material and carbon as the negative electrode material. The rated voltage of the monomer is 3.2V, and the charging cut-off voltage is 3.6V-3.65V.
During the charging process, some lithium ions in lithium iron phosphate are removed and transferred to the negative electrode through the electrolyte, which is embedded in the negative electrode carbon material; At the same time, electrons are released from the positive electrode and reach the negative electrode from the external circuit, maintaining the balance of chemical reactions. During the discharge process, lithium ions detach from the negative electrode and reach the positive electrode through the electrolyte. At the same time, the negative electrode releases electrons, which reach the positive electrode from the external circuit and provide energy to the outside world.
Lithium iron phosphate batteries have the advantages of high working voltage, high energy density, long cycle life, good safety performance, low self discharge rate, and no memory effect.
In the crystal structure of LiFePO4, oxygen atoms are tightly packed in a hexagonal arrangement. The PO43 tetrahedron and FeO6 octahedron form the spatial skeleton of the crystal, with Li and Fe occupying the octahedral voids, while P occupying the tetrahedral voids, where Fe occupies the co angular position of the octahedron and Li occupies the co edge position of the octahedron. The FeO6 octahedra are interconnected on the bc plane of the crystal, while the LiO6 octahedra structure in the b-axis direction is interconnected into a chain like structure. 1 FeO6 octahedron coexists with 2 LiO6 octahedrons and 1 PO43 tetrahedron.
Due to the discontinuity of the FeO6 co octahedral network, electronic conductivity cannot be formed; At the same time, the PO43 tetrahedron restricts the volume change of the lattice, affecting the de embedding and electron diffusion of Li+, resulting in extremely low electronic conductivity and ion diffusion efficiency of LiFePO4 cathode material.
The theoretical specific capacity of LiFePO4 batteries is relatively high (about 170mAh/g), and the discharge platform is 3.4V. Li+undergoes a charge discharge process by removing and embedding it back and forth between the positive and negative electrodes. During charging, an oxidation reaction occurs, where Li+migrates from the positive electrode and is embedded into the negative electrode through the electrolyte. Iron changes from Fe2+to Fe3+, leading to an oxidation reaction.
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