The only way to pre-empt being accused of DV is either to follow the suggestion above (repair your relationship) or move out before you are accused of any physical harm and things get out of hand. If you cannot / do not wish to move out then proving any (potential) accusations false is the (only) way to go. Alternatively, seek legal assistance from a family law solicitor.
It is not for the forum members to judge who is at a fault in your relationship. So, while you mention your wife's "frivolous" attempts to accuse you, no one here is any wiser to determine if there's another side to the story.
With regards to your query regarding naturalisation application, see Annex D:
The good character requirement.