For explanations, I would recommend the following link:

http://www.mpoweruk.com/lithiumS.htm
"The cathode material is made up from Lithium liberating compounds, typically the three electro-active oxide materials, Lithium Cobalt-oxide LiCoO2 , Lithium Manganese-oxide LiMn2 O4 , and Lithium Nickel-oxide LiNiO2
Lithium salt constitutes the electrolyte."

You certainly should not use "by" in this context.