On the calendar degradation

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Fra
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11 Jul 2023 15:28 - 11 Jul 2023 21:08 #12311 by Fra

On the calendar degradation was created by Fra

Hello Paul,

I'd like to calculate the calendar degradation occurring in a battery that is not cycling at all. From SAM I'm getting values of calendar degradation greater than 100%.
In the following graph you can see the "battery relative capacity to nameplate (calendar) (%)" and the "battery relative to nameplate (%)" I'm getting:

Both "battery relative capacity to nameplate" don't look right because at the end of the lifetime I would expect some calendar degradation.

Please can you review why that is happening?

Many thanks in advance

Best regards
Fran

Last edit: 11 Jul 2023 21:08 by pgilman. Reason: For some reasons my post was not entirely published

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pgilman

12 Jul 2023 23:25 #12323 by pgilman

Replied by pgilman on topic On the calendar degradation

Hi Francesco,

SAM's model for Lithium-ion NMC/Graphite assumes that the battery experiences some initial capacity fade at the beginning of its life. The initial capacity is slightly over 100% so that it levels out to 100% within the first few months of use.

Best regards,
Paul.

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Fra
Topic Author

13 Jul 2023 11:31 #12324 by Fra

Replied by Fra on topic On the calendar degradation

Hi Paul,

many thank for your reply.
The system I was modelling is a li.ion LFP not NMC.
My question then is: how should I model a battery that at day 0 has 100% capacity and starts degrading according to li-ion lfp calendar degradation?
Many thanks
Best
Fran

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