Debit spreads is a leveraged bet and pays out if the lower leg of the spread is crossed and maxes out when the upper leg of the spread is crossed. If the price holds above the price near expiration than OP will make a good amount, if it drops below the lower leg he gets nothing.
For example with OP, for SPCX 135/145 spreads expiring on 9/25, if the price stays above $145 he will max out his gains, if it drops below $135 in a week he is going to lose the whole bet, if it is somewhere in the middle, well he will probably break even or make some money.
Absolutely and all the models point to a deficit of supply between 2028-2030 while consumption is forecast to triple by 2040. Mining companies are still spending billions on acquiring lithium producers and they wouldn't be spending this money if they thought that the battery tech would get replaced by sodium batteries in the near future.