> Like CATL announced a cost of $19 per kwh > I think the actual cost to buy one now it more $40-60.

Plus battery assembly and installation costs (inverter, grid connection).

> If you spread $60 over 15000 cycles

A 30 year lifetime (11k cycles if charged/discharged once a day). Using a 5% discount rate the cost goes up to 0.78c/kWh for the cells. The cost goes up if it can not cycle once a day, for instance intermittent source of energy or excess capacity. And the cost goes up with all the rest of the equipment involved, and round trip efficiency.