I am just about finished with my PhD. During the past year or so, I managed to develop my own little spot of theory. I have done this almost entirely independently. However, my advisor typically adds his own name to the papers before publication as a matter of course, with not much more contribution than adding references. Often, any changes he makes I must correct later, because he has not actually worked on the theory and often has not read the manuscript well enough to even understand the arguments fully, so often adds in incorrect claims. He is generally a nice guy on a personal level, and occasional discussions are often enjoyable and sometimes do develop ideas for research, but I don't believe they meet the guidelines for authorship, and I hate giving authorship to someone who doesn't even read my work. Also, I do not receive his funding or rely on him for material/equipment etc, so it is not a matter of financial dependence.
This next paper will be most likely my final paper before I get my PhD. I managed to obtain results of which I am particularly proud, and I have done so entirely independently of my advisor. So far, all my results are basically finished and I have not required any discussion with him on the work for guidance.
How can I diplomatically, but assertively bring up the possibility of wanting to be the sole author on this publication? The work is entirely my own, and I really want single-authorship on the work I have done to show that I am a completely independent scientist.