Chains for Ebike would be better...a bit expensive
KMC X9e EPT E-Bike Chain
http://www.bike24.com/1.php?content=8;navigation=1;menu=1000,2,83;product=94463
KMC X9-93 Chain
http://www.bike24.com/1.php?content=8;navigation=1;menu=1000,2,83;product=7762