This is highly dependent on hardware. Most laptops at the hardware level, will not allow you to stop charging the battery. LION batteries actually benefit from a small uncharge - recharge cycle, and most laptops will have that cycle built in at the hardware level.
Meaning as your battery indicator says 100% the battery is actually discharging and recharging a tiny little bit to keep it healthy. Also, for most laptops 100% is not full.
Some laptops in windows, have an option to "Disable charging", but this was just a throwback to NiCad batteries. These days all that "setting" does is enable "performance" mode.
If your looking for the same kind of switch then I recommend Jupiter. It will allow you to easily move between performance modes, but again not control charging directly.
Because stopping that charging cycle is very bad for current batteries it's not very popular. Because it's not popular, I doubt you will find a good GUI tool to do it. Your best bet, might be looking around in
/sys/class/power_supply/BAT0 like areas and seeing what you can find, but I am pretty sure, that your not going to be able to disable charging.