# Half-cell model with SEI growth

**URL:** <https://pybamm.discourse.group/t/half-cell-model-with-sei-growth/432>\
**Category:** General\
**Created:** [8 January 2026 14:43 UTC](https://pybamm.discourse.group/t/half-cell-model-with-sei-growth/432 "2026-01-08T14:43:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![oarcelus](https://avatars.discourse-cdn.com/v4/letter/o/46a35a/32.png) [@oarcelus](https://pybamm.discourse.group/u/oarcelus)\
**Post date:** [8 January 2026 14:43 UTC](https://pybamm.discourse.group/t/half-cell-model-with-sei-growth/432/1 "2026-01-08T14:43:22Z")

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Hi, I am wondering how could I implement a SEI growth model in the Li-metal side in a PyBAMM half-cell model. I am not finding a direct way of doing it. Maybe I need to resort to building a custom model?