It would be safer and probably more realistic to say that your research will ‘address a gap’, rather than that it will ‘fill a gap’.
When readers come to your assignment, dissertation, or thesis, they will not just assume that your research or analysis is a good idea; they will want to be persuaded that it is relevant and that it was worth doing.
With small-scale writing projects, the literature review is likely to be done just once; probably before the writing begins.
With longer projects such as a dissertation for a Masters degree, and certainly with a Ph D, the literature review process will be more extended.
The ability to review, and to report on relevant literature is a key academic skill.
A literature review: To some extent, particularly with postgraduate research, the literature review can become a project in itself.
A poorly executed scientific literature review can destroy a research thesis in four easy steps: It’s not about maximizing the quantity of material reviewed, nor should the objective be to read “everything” about your proposed topic – for some topics that would be a physical impossibility.
Focus on the relevance of the material to your proposed topic, and map out a logical framework for analyzing that material.
Increased ease of access to a wider range of published material has also increased the need for careful and clear critique of sources.
Just because something is ‘published’ does not mean its quality is assured.