TL;DR: If you want more thrust, you can either get more energy or just reduce the propellant efficiency.
You can create electric propulsion for any range of thrust/Isp (propellant efficiency).
It basically boils down to the impulse formula and the kinetic energy formula.
All types of electric propulsion turn electric energy into kinetic energy. The amount of electric energy depends on your power source.
If you have an amount of energy X you can turn it into kinetic energy by
But, the amount of thrust you generate depends on the impulse formula:
$I = mv$.
There is your problem: to get more thrust you can increase either mass expelled per second or the speed at which you expel that mass. But increasing speed of propellant requires an exponential increase in energy ($v^2$ remember) while an increase in mass requires just a linear increase in energy.
This boils down to a simple formula: If you have a fixed amount of energy available you basically can trade between propellant efficiency and amount of thrust generated: halving your exhaust velocity means generating four times the thrust.
Now, since a rocket has to carry all the propellant with it from the start, you normally want it to be as propellant-efficient as possible (basically in space, mass is a far more valuable thing than time). This is why electric propulsion normally trades thrust for as high an Isp as possible.
Now if you find a way to generate more energy for the same mass…than you can keep your high-Isp electric propulsion engine and increase the thrust for the same amount. (Or increase your Isp a tiny bit more.)