Splitting a 10amp 2.1mm DC barrel into positive and negative
The problem with connectors like that is they have too much resistance and they heat up. I'd buy it and make sure it doesn't heat up under full load. If it does then find a different option. 

Another option might be to find a jack and solder on wires, this was the only jack rated for 10A on digikey. 

You can also cut the wires and not use a jack, or cut the wires and solder on a terminal. Or cut the wires and use a terminal to terminal adapter.