I am studying the electrochemical behaviour of  the LiCuPO4 material as cathode for Li-ion battery.  I have performed CV analysis for my experiments in the potential window 1.0 to 4.5 V.

Electrolyte :  1M LiPF6 in (EC:DEC)

Scan rates : 0.5 mV/s

Could someone please tell me why the peaks disappeared on the 5th cycle? Can I say that this material is not stable and decomposed?

Many thanks,

Vinsensia

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