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Lithium metal flow battery system and preparation method for same

A liquid flow battery and battery system technology, applied in the direction of regenerative fuel cells, etc., can solve the problems that dendrites are easy to pierce the diaphragm, easy to volatilize, and block the channel of oxygen transmission, etc., to achieve improved lithium polarization and high discharge specific surface area , Improve the effect of accumulation problems

Inactive Publication Date: 2012-08-15
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Lithium metal flow battery system and preparation method for same
  • Lithium metal flow battery system and preparation method for same
  • Lithium metal flow battery system and preparation method for same

Examples

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specific Embodiment 1

[0026] Stainless steel plate is used to process the positive and negative terminal plates, and a hole is set on the four corners of the end plate for four fixing screws. The graphite plate is used to process the positive and negative electrode collector tanks with built-in circuitous flow channels, and polypropylene is used. The composite membrane of membrane and silicon dioxide is the diaphragm, and the thickness is 0.5mm. The silicone gasket is used as the sealing gasket, and its length and width are matched with the current collector groove, such as figure 2 The sequence shown is assembled in turn, and the battery body is sealed and fixed by the screws and gaskets at the four corners; the stainless steel tubes with inner and outer diameters of 2mm and 4mm are used as the positive and negative slurry delivery tubes, and the stainless steel tank with a volume of 50mL is used as the positive and negative electrodes The slurry storage tank is tightly connected with the circulat...

specific Embodiment 2

[0028] Such as figure 1 and figure 2 As shown, the lithium metal flow battery system is assembled according to the first embodiment, the positive and negative electrode slurry storage tanks 5, the circulation pump 4 and the battery body are closely connected to each other through stainless steel tubes 3 to form a complete closed circuit; the lithium-silicon alloy powder (Li 44 Si) and LiPF 6 The concentration is 1molL -1 The EC and DMC (volume ratio is 1:1) organic liquid electrolyte are mixed evenly, and the concentration of the prepared lithium alloy powder is 10molL -1 Negative electrode mixed slurry; activated carbon and the same organic liquid electrolyte used in the above-mentioned negative electrode are mixed evenly, and the concentration of activated carbon prepared is 5molL -1 The positive and negative electrode mixed slurry of the above-mentioned assembled lithium metal flow battery system is injected into the positive and negative electrode slurry storage tanks...

specific Embodiment 3

[0030] Lithium powder and LiPF 6 The concentration is 1molL -1 The EC and DME (volume ratio is 1:1) organic liquid electrolyte are mixed evenly, and the concentration of the prepared lithium powder is 10molL -1 Negative electrode mixed slurry; Prepare activated carbon-supported PdAu (marked as PdAu / C) as a positive electrode catalyst by impregnation reduction method, wherein the mass content of PdAu is 5% (Pd and Au atomic ratio is 1:1), PdAu / C Mix evenly with the same organic liquid electrolyte used in the above-mentioned negative electrode, and prepare PdAu / C with a concentration of 5molL -1 The positive electrode mixed slurry; Assemble the lithium metal flow battery system according to the first embodiment, such as figure 1 and figure 2 As shown, the positive and negative electrode slurry storage tanks 5 are closely connected with the circulation pump 4 and the battery body through stainless steel tubes 3 to form a complete closed circuit; Fill the storage tank with th...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCY02E60/50
Inventor 崔光磊王晓刚董杉木张立学许高洁刘志宏
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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