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Lithium batteries commonly used parameter calculation formula is what

by:Vglory      2020-12-05
Lithium batteries commonly used parameter calculation formula is what, what is the parameter calculation of lithium-ion batteries, how to calculate the lithium battery parameters? A formula to calculate how much do you know? Our Beijing lithium battery manufacturer on this now to give you a good talk about! ( 1) The theoretical capacity of electrode material and electrode material, theoretical capacity, assuming that material of lithium ion all participate in the capacity of that provided by the electrochemical reaction, its value through the equation: so, the mainstream theory of material capacity computation formula is as follows: LiFePO4 molecular weight 157. 756 g/mol, its theoretical capacity of: material sliding (similarly available: three yuan :) ( LiNi1/3Co1/3Mn1/3O2) Molecular weight is 96. 461 g/mol, and its theoretical capacity of 278 mAh/g, LiCoO2 molar mass, 97. 8698 g/mol, if lithium ion all out, its theoretical capacity of 274 mAh/g. Large amount of graphite anode of lithium embedded, formation of lithium compounds of carbon layers and chemical formula LiC6, namely a Li six carbon atoms. 6 C molar mass is 72. Theoretical capacity of 066 g/mol, graphite is: for silicon anode, from 5 li si + 22 + + e - 22 Li22Si5, five of the silicon molecular weight is 140. 430 g/mol, five of the silicon atoms with 22 Li, capacity of silicon anode theory: the theory of the calculated value is g capacity, in order to ensure the material structure is reversible, actual lithium ion embedded coefficient is less than 1, g capacity is: the actual material real = g capacity lithium ion embedded off coefficient x theory capacity ( 2) Battery design capacity of the battery capacity = tu level density * live material g capacity * live material proportion sheet coating area, surface density is one of the key design parameters, mainly in the coating and rolling process control. Compaction density unchanged, besmear level density means the sheet thickness increases, the electronic transmission distance increases, electronic resistance increases, but the increase is limited. Thick film, lithium ion electrolyte in the transfer impedance increase is the main reason for the effect on the characteristic ratio, considering the twists and turns, together with the porosity and pore, ions in pore migration distance out many times more than the thickness of the sheet. ( 3) N/P ratio is the cathode active material g capacity * cathode active matter content of the cathode surface density than the present, The positive active material * the anode surface density * g capacity than the positive active matter content) Graphite anode class battery N/P is greater than 1. 0, 1. 04 ~ 1. 20, which is mainly for security design, mainly in order to prevent the negative analysis of lithium, should consider when designing process capability, such as deviation. But, when the N/P is too large, battery irreversible capacity loss, cause the battery capacity is low, the battery energy density also reduces. For the lithium titanate cathode, adopt the positive excess design, battery capacity determined by the capacity of lithium titanate cathode. The positive excess design to improve the high temperature performance of the battery: high temperature gas mainly comes from the cathode, the anode excessive design, the cathode potential reduction, more easily in the formation of the SEI film lithium titanate surface. ( 4) Coating the compaction density and porosity in the process of production, the battery pole piece coating compaction density formula: while considering the plate rolling, the metal foil is extended, roller under pressure after coating the surface density of computing: coating consists of living substance phase, carbon rubber phase and the pore, porosity calculation formula, the average density of coating are as follows: on the parameter calculation formula of lithium-ion batteries we introduce here oh, if there are other want to know can be more focus on our lithium battery manufacturer
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