Try to get a job and save a little bit money, and then ask for divorce. His hu*****and should pay her alimony for one or two years, and Child supports according to law. Mom normally got the custody anyway, although dad is possible, but the odds was so little.
However, the best way is to face her hu*****and, and let him realize what was wrong he did in the marriage. If the communication were still not working, divorce should be a solution. You don't want kids grow up in a family with too much domestic voilences, do you?