Before taking pen to paper, ask yourself what your intended readership should be. For whom are you writing?
A very terse paper providing minimal introduction and using highly specialised knowledge will be understandable only to a narrow circle of the anointed. To broaden your audience, show respect to an average (not super-knowledgeable) reader. That is to say, provide a sufficiently detailed introduction.
On the other hand, if you extend the introduction beyond reasonable, and try to include there all you know about the subject, the editor may rightly remind to you that a research paper is not a review.
So you have to navigate between the two extremities. Ideally, a research paper must be understandable (a) to graduate student working in this field, and (b) to experts working in closely adjacent areas. The latter is needed for cross-pollination.
One possible strategy is to write a very extended, textbook-like introduction -- and then to squeeze it by deleting too trivial things, and by moving some of the remaining stuff to appendices or supplementary electronic materials to be cited in the main text.