Will a man be held accountable if he refuses his wife's request for intercourse, despite her asking for it?

If a husband abandons his wife without a valid excuse, despite her need for him, then he is unjust to her and neglects her right, because he is obligated to satisfy her needs to the best of his ability and according to her necessity. However, if he has a valid excuse, such as illness or the like, then there is no sin upon him.