A query was raised regarding the lithium content in an ICR18650 2.6AH battery.
The inquiry was as follows: "If lithium is utilized, what is the proportion of lithium in grams per cell?"
Firstly, let's revisit fundamental chemistry concepts:
Moles:
A unit representing the amount of substance containing a specific number of particles.
Avogadro's constant (NA):
Approximately 6.02214076×10²³mol/L
Molar mass:
The mass possessed by one mole of a substance M= g/mol
When expressed in grams per mole (g/mol), the numerical value corresponds to the relative atomic or molecular mass.
The molar mass of lithium is M=6.9410g/mol
For LiFePO4 it is 157.756g/mol
Lithium content within LiFePO4 = (6.94g/mol /157.756/mol)*100% = 4.4%
The molar mass for NCM (1:1:1) material stands at 96.461g/mol with a theoretical capacity of 278mAh.
Lithium content within NCM = (6.94g/mol /96.461/mol)*100% =7 .19%
LiCoO2 has a molar mass of97 .8698 g/ mol and theoretical capacityof274mAh/g.
Lithium content within cobalt oxide =(6 .94 g/ mol /97 .8698 g/ mol)*100%=7 .09%
Methods for calculating lithium content in lithium-ion batteries:
For ICR18650 2 .6AH battery weighing47 gwith LiCoO2 constituting48 %of its weight,
the calculatedlithiumcontentis approximately1 .60grams(47*48%*7 .09%).
Additionally,the electrolyte contains certain amounts ofsodium ions; however,due to their relatively small quantity comparedtothe totalbatteryweight(approximately1 .37%), they are not includedinthiscalculation.