As the vehicles most promising of electricity from lithium-ion Laptop battery, lithium iron phosphate power battery has excellent safety, long cycle life, high energy density advantages. But how to improve the performance of its magnification to improve its high temperature characteristics, so as to satisfy the hybrid electric vehicles and pure electric vehicles, the use of demand is the lithium iron phosphate manufacturers are faced with important questions . Improving the performance of the supply of lithium iron phosphate, high performance and low temperature, the first approach is positive and negative materials, nano-technology, doping and carbon coated, followed by selection and the rational use of conductive agent, 3 to choose low electrolyte temperature, of course, a structural design reasonable, a reasonable choice gap, this article introduces the agent driver in the application of lithium iron phosphate describes how a reasonable choice conducting agent, how wise use of the conductive agent, thereby enhancing the lithium iron phosphate for high performance and low temperature performance and a magnification to prolong the life of lithium phosphate iron.
The lithium iron phosphate work
Lithium iron phosphate does the following diagram -1 and -2 shows the following pattern:
1, charge a Li + crystals of iron phosphate lithium surface 010 of crystal migration to the surface under the action of the electric field strength in the electrolyte through the diaphragm, and then migrate through the electrolyte to the surface of graphite crystals, and then incorporated in the crystal lattice of graphite. At the same time, e-flow positive response by the conductor of the collector foil after an ear, the pole of the sony VGP-BPS2 battery and the external circuit, the negative, the flow of anode copper anode set of ear fluid, and flows then through the conductors of graphite anode, so that negative electrical Heda balanced. Lithium iron phosphate lithium-ion elimination of the inlay, iron phosphate lithium iron phosphate, its structural changes in the trellis diagram above -2.
2, the battery discharge, Li + de-embedded crystal graphite in the electrolyte through the diaphragm, and then migrate through the electrolyte to iron phosphate crystals of lithium on the surface, then re-integrated into surface by 010 lithium iron phosphate in the crystal lattice. At the same time, the battery passes through the conductor collector of copper cathodes, after an ear, the battery negative column, outside the circuit, the positive pole, the positive ear flow VGP-BPS10 battery cathode current collector sheet aluminum and circulate through the iron phosphate conductive body lithium anode, so that the positive electric Heda balanced.
Lithium iron phosphate from works that we can see that the lithium iron phosphate loading and unloading process is lithium ion and electron to participate, and lithium-speed migration of ions and the speed migration of electrons to strike a balance. This requires positive and negative electrodes for lithium-ion conductor mixed ionic and electronic and ionic conductivity and electronic conductivity must be consistent. But we all know, the conductivity of iron phosphate lithium poor performance. The conductivity of the graphite anode, while the best, but to achieve significant rates of rejection, we still need to improve cathode conductivity, so that the electronic conductivity of lithium ion-embedded in graphite the ability to find a balance.
To meet the lithium iron phosphate positive and negative conduction problems, it must be added to the battery positive and negative conducting agent, so that the active ingredient in the formation of battery model in Figure -3 and figure 4 SEM photographs shown in the effective conductive network. 2 if the BATCL50L battery capacity of ion conduction that I set, the electronic transmission capacity set to E, then in theory I = E, 3, to ensure the battery charge and discharge process, the burden of maintaining homeostasis: I = I = cathodic electrolyte I = I divide electrolyte cathode = I, E = collector anode-cathode current E = E = ear very CRT-chu E = E = external circuit cathode E-chu anode = E = ear E = E anode from the cathode current collector. (This equation is actually three lithium-ion battery designed for an important principle, but the actual process of design and production process itself, how to achieve these three equations, but also need to develop a series of experiments to verify a mathematical model or an empirical formula, and then these models, or formulas to achieve the design of lithium-ion battery)