Redox flow battery using electrolyte concentration gradient and operation method thereof

A redox flow battery, comprising:

• a first catholyte tank having an electrolyte inlet at a top thereof and an electrolyte outlet at a bottom thereof and having a partition plate for forming a concentration gradient of a catholyte received therein;
• a second catholyte tank having an electrolyte inlet at a top thereof and an electrolyte outlet at a bottom thereof and having a partition plate for forming a concentration gradient of a catholyte received therein;
• a first anolyte tank having an electrolyte inlet at a top thereof and an electrolyte outlet at a bottom thereof and having a partition plate for forming a concentration gradient of an anolyte received therein;
• a second anolyte tank having an electrolyte inlet at a top thereof and an electrolyte outlet at a bottom thereof and having a partition plate for forming a concentration gradient of an anolyte received therein;
• and
• a stack for charging and discharging power by receiving the catholyte and the anolyte supplied from the first and second catholyte tanks and the first and second anolyte tanks.

A redox flow battery, comprising:

• a first catholyte tank having an electrolyte inlet at a top thereof and an electrolyte outlet at a bottom thereof and having a barrier rib provided in a vertical direction to form a concentration gradient of a catholyte received therein;
• a first anolyte tank having an electrolyte inlet at a top thereof and an electrolyte outlet at a bottom thereof and having a barrier rib provided in a vertical direction to form a concentration gradient of an anolyte received therein;
• and
• a stack for charging and discharging power by receiving the catholyte and the anolyte supplied from the catholyte tank and the anolyte tank.