Lithium metal flow battery system and preparation method for same

Abstract

A lithium metal flow battery system and a preparation method for the same belong to the field of electrochemical power sources. A cathode of a lithium metal flow battery is made of slurry formed by mixing lithium metal powder or lithium alloyed powder with organic liquid electrolyte containing lithium salt, an anode of the lithium metal flow battery is made of mixed slurry formed by the same organic liquid electrolyte and carbon catalyst or carbon-loaded catalyst, high-purity oxygen saturated in the slurry serves as oxidizer, a polymer composite membrane for separating the anode from the cathode is arranged in the middle, a lithium ion migrates between the two electrodes by means of the organic liquid electrolyte and the membrane, and an electron flows on an external lead connected with the anode and the cathode and a load to generate current. The novel lithium metal flow battery can be continuously used only by means of circulating feeding, and lithium metal can be regenerated by recovering discharge products in anode slurry and reused as cathode materials. The lithium metal flow battery system has the advantages of high energy density, continuous and stable operation, simple structure, long cycle life, high safety, high power density, and capability of realizing quick charge and discharge.

Description

technical field [0001] The invention relates to the field of chemical power sources using electrochemical reactions to convert electrical energy, in particular to a lithium metal liquid flow battery system and a preparation method thereof. Background technique [0002] With the rapid development of society and economy, the problems of energy shortage and environmental pollution are becoming more and more serious. The comprehensive development and utilization of new energy and efficient energy conversion and storage systems are the key issues for the sustainable development of today's society. For nearly two decades, lithium-ion batteries based on metallic lithium have dominated the development of high-performance batteries due to the low redox potential, low density, and high electrochemical equivalent of metallic lithium. Since the industrialization of lithium-ion batteries by Sony Corporation in 1991, research on improving the energy density of lithium-ion batteries and th...

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Problems solved by technology

[0003] However, the actual capacity of lithium-air batteries is far lower than the theoretical capacity, and there are still many problems to be solved. At present, the main factors restricting its development and application are as follows: the discharge product (lithium oxide) generated by the positive oxygen reduction reaction or lithium peroxide) are insoluble in organic liquid electrolytes, and will deposit in the micropores of the porous air electrode, gradually blocking the oxygen transfer channel as the reaction progresses, preventing oxygen from diffusing to the surface of the catalyst and interacting with lithium ions in the electrolyte contact and reaction, leading to the termination of discharge, affecting its actual capacity and continuous use; in addition, because lithium-air batteries work in an open environment, commonly used organic liquid electrolytes are prone to volatilization, which affects the discharge capacity and service life of the battery And the safety of the battery; the dendrites generated during the charge-discharge cycle of the metal lithium sheet electrode are easy to pierce the separator and cause a short circuit, and the replacement of the metal lithium sheet after long-term operation is also a thorny problem

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