Lithium double-fluid flow battery

Abstract

The invention provides a lithium double-fluid flow battery, which comprises a porous positive current collector, a positive reaction cavity, a diaphragm, a metal lithium negative plate, a negative reaction cavity, a positive suspension and a negative electrolyte, wherein a gap with a certain distance exists between the diaphragm of the battery and negative metal lithium; the gap is fully filled with the negative electrolyte which continuously or intermittently flows; and a solid-liquid composite dual-diaphragm structure is formed by the diaphragm and the negative electrolyte. Through continuous or intermittent washing by the electrolyte, the problem of potential safety hazards caused by lithium dendrites generated by a metal lithium negative electrode in charge-discharge processes is solved; and meanwhile, the lithium double-fluid flow battery plays roles in purifying the negative electrolyte, cleaning the diaphragm and adjusting the concentration of the positive suspension.

Description

technical field [0001] The invention belongs to the chemical energy storage battery technology, in particular to a lithium dual flow battery. Background technique [0002] Lithium-ion flow batteries have the advantages of independent output power and energy storage capacity, high energy density, and low cost, and have good application prospects in the fields of electric vehicles and grid energy storage. Lithium-ion flow battery consists of a positive electrode suspension pool, a negative electrode suspension pool, a battery reactor, a liquid pump (or other power system) and a sealed pipeline. The suspension pool flows between the battery reactor, and the positive electrode suspension and the negative electrode suspension electrochemically react on both sides of the diaphragm inside the battery reactor. [0003] Since metal lithium has a high theoretical specific capacity of 3860mAh / g and can provide an independent lithium source, it can replace the negative electrode suspen...

AI Technical Summary

Problems solved by technology

[0005] In view of the above existing problems, there is a gap at a certain distance between the diaphragm of the lithium dual flow battery of the present invention and the negative electrode metal lithium, and the gap is filled with a negative electrode electrolyte that flows continuously or intermittently, and the diaphragm and the negative electrode electrolyte that flow continuously or intermittently form a gap. The solid-liquid composite double-membrane structure solves the safety hazards caused by lithium dendrites in the lithium negative electrode during charging and discharging through continuous or intermittent scouring of the electrolyte, and at the same time purifies the negative electrode electrolyte, cleans the diaphragm, and regulates the positive electrode. Effect of Suspension Concentration

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