It seems easy to find articles about how to structure an article, but less easy to find things about good use of language in general. Here are a few things that might help with academic or scientific writing, including choice of words, writing well-structured sentences and paragraphs, and grammar.
Scitable: English Communication for Scientists. Has a section about writing scientific papers, but also general information on communicating as a scientist and sections on oral presentations and interacting at conferences. Click Table of Contents to see everything.
EASE Toolkit for Authors. “Guidelines and resources for scientific writing and publishing…” from the European Association of Science Editors.
Writing for publication: an easy to follow guide for nurses interested in publishing their work. [Internet].: Wiley; 2014 [cited 16th March 2017]. Available from: www.wiley-docs.com/HSJ-14-63694_Writing_for_Publication_lowres.pdf.
Higher Education Academy. Effective research writing: STEM discipline. [Internet].: Higher Education Academy; 2013 [cited 16th March 2017]. Available from: https://www.heacademy.ac.uk/resource/writing-publication-effective-research-writing-techniques.
These may need a subscription or access through your library:
Bain BJ, Littlewood TJ, Szydlo RM. The finer points of writing and refereeing scientific articles. Br J Haematol. 2016 Feb;172(3):350-9.
Dixon N. Writing for publication–a guide for new authors. Int J Qual Health Care. 2001 Oct;13(5):417-21.
Fahy K. Writing for publication: argument and evidence. Women Birth. 2008 Sep;21(3):113-7.
Fahy K. Writing for publication: the basics. Women Birth. 2008 Jun;21(2):86-91.
Ridgway G. Writing for publication and avoiding pitfalls. Clin Teach. 2015 Apr;12(2):73-7.
Hall GM. How to write a paper. 5th ed. Chichester: Wiley-Blackwell/BMJ Books; 2013.
which has a chapter on style, or at books about academic writing, study skills or doing a research project.