It comes from the fact that in an electrochemical cell, the cations are those that are reduced.

这来源于在电池中，正离子是被减少的。

麻省理工公开课 - 固态化学导论课程节选

The positive ions are electron deficient, and these are known as cations.

正离子是缺少电子的，这些就是正离子。

麻省理工公开课 - 固态化学导论课程节选