Incorrect spelling, explanation: excells is an incorrect form because unlike the correct one – excels – it seems like it underwent a completely different derivation process. Because as of now there is only one l in excel, excells seems like it was made out of the prefix ex- and cells (as in plural form of cell), which would suggest a completely different meaning, not at all related to the original.
Correct spelling, explanation: excels is a third-person singular present form of the verb excel (he/she/it excels). The word originates from Latin excellere, but the word lost the double l over time in order to suit the English standards better.
Definition of excels:
Verb, third-person singular
1. to perform extremely well in something; to be very good at something
Not only is she very sweet, but she also excels in her studies.
Mark excelled at tennis, he even got qualified for an ATP tournament.
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Actually it is nearly impossible to find educated data in this particular spelling subtleties, yet your dictionary seems like a reliable source! Thank you.
You made a really really good spelling guide here.