sorry, thought the powerpoint was self-explanatory… charts were mostly voltage or current vs. time.
Greg
p.s., I don’t think this is any easier to understand especially if current vs. time does not make sense:
"
Safety
One important advantage over other lithium-ion chemistries is thermal and chemical stability, which improves battery safety.[7] LiFePO
4 is an intrinsically safer cathode material than LiCoO2 and manganese spinel. The Fe-P-O bond is stronger than the Co-O bond, so that when abused, (short-circuited, overheated, etc.) the oxygen atoms are much harder to remove. This stabilization of the redox energies also helps fast ion migration.[citation needed]
As lithium migrates out of the cathode in a LiCoO2 cell, the CoO2 undergoes non-linear expansion that affects the structural integrity of the cell. The fully lithiated and unlithiated states of LiFePO
4 are structurally similar which means that LiFePO
4 cells are more structurally stable than LiCoO2 cells.[citation needed]
No lithium remains in the cathode of a fully charged LiFePO
4 cell—in a LiCoO2 cell, approximately 50% remains in the cathode. LiFePO
4 is highly resilient during oxygen loss, which typically results in an exothermic reaction in other lithium cells.[5]"
oh well… for those of you interested, you can buy them now. Greg