we fabricated LiFePO4 from glass form and performed cathode. firstly the stokiometric ratio of Li2O2, Fe2O3 and P2O5 were mixed and melted 1100 C and quenched. after obtain the material in the glass form which seen in the XRD graph, we added %10 sacarose as a carbon source and it was annealed at 700 C under H2/Ar atmosphere . the xrd pattern prove that the phase belongs to LiFePO4.
The CV graph of the cr2032 cell was attached as below which is as expected. but the capacity value is below 40 mAh/g. does anybody has a suggestion ?
and the cv graph was attached as seen but the capacity value is below 40 mAh/g. does anybody have suggestion ?
Dear Serdar Altin ,
1) What is the (composite ?) active material's configuration[1] on the (Al ?) current collector ?
2) What is the V-rate in this[2] CV ?
3) Could you try a lower V-rate ?
1. A SEM (or even a common optical) photo of the WE might be helpful.
2. Your initial CV - graph: 360459F3-786D-4C36-8A69-5CEBA2 806ACC.jpeg
Hi,
Did u check the particle size of LiFePO4? And was it phase pure material? CV curves doesn't look sharp as well.
Dear Serdar Altin
It is important to know the scan rate you have used for the CV measurement. Because the capacity and scan rate are closely related in the opposite manner such as high scan rate leads to low capacity.
It should be noted that the mass loading of active material (LiFePO4) has to be considered if you are calculating the specific capacity.
As asked by Prof. Ioannis Samaras
If you furnish the details, it would be easy to find the problem.
i found that there are two problem about LifePO4, one is particle size which should be lower than 1 micrometer, since the electrical conductivity is very low, second is the pressure that the electrode should be pressed before the collect battery cell
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