Depending on what you're trying to charge, if it doesn't require too much power, you might want to look into a 220 to 110 volt `stepdown' transformer. What? I want to raise the voltage, not lower it! Ok, so use the transformer in reverse. All of a sudden, 110 volts in, will give you 220 volts out. Just make sure the transformer has enough current carrying capacity to handle the load.
An electrical supply outlet should be able to help you get what you need.