Part of Cell capacity.

When cell is rested after non-stop cycling, its capacity can recover for multiple reasons:

• Anode overhang effects can increase measured cell capacity after rest at 100% SoC
• Change in the homogeneity of Lithium distribution in the anode (and cathode?) [2]
• Reversible Lithium plating: see Cell capacity fade accelerates when Lithium deposition becomes irreversible.

The authors of [1] suggest that Frequent rest recovers capacity and prolongs a cell's life because Lithium plating is a self-reinforcing process, therefore, preventing it early leads to compounding benefits.

The reverse process is Cell capacity fade.

References

[1] Investigation of capacity recovery effects due to rest periods during high current cyclic ageing tests in Li-ion cells and their influence on lifetime

[2] Evaluation of cyclic aging tests of prismatic automotive LiNiMnCoO2-Graphite cells considering influence of homogeneity and anode overhang