In short, no. Not in a cost-effective manner anyway.

You could easily wind up spending $5000 trying to turn your CR-V into a quasi hybrid. Without the proper gearing, motor controllers and deep cycle batteries, you'd be lucky to get 10 miles on a charge assuming you actually want to have usable cargo space left over.

Also, realize that for every pound of batteries, that's one less pound availble for people and their cargo. You could very well exceed the Gross Vehicle Rolling Weight even before a single passenger is on board.

If the mileage on your CRV is killing you, the best bet is to get out of the SUV market before blue book prices fall any further. The second-hand market is flooding with SUVs and new ones are lingering on the lots.

If you've got $5K to spend on a science project like the one you're proposing, it'll be better spent as a down payment on a new Civic EX-L. That car will do mid 30s in the city and about 40 mpg hwy assuming you aren't thrashing it within an inch of it's life.