Lithium isotope separation method and device

A separation method and technology for lithium isotopes, which are applied in separation methods, separation of different isotopic elements, and dispersed particle separation, etc., can solve the problems of solvation effect of convective disturbance ions, affecting the effect of isotope separation, etc., and achieve simple and reliable separation devices. Production cost and the effect of improving production efficiency

Active Publication Date: 2022-08-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrochemical separation methods usually use aqueous or organic solvent electrolytes, which have severe convective disturbances and ion solvation effects, which affect the isotope separation effect based on the isotope diffusion coefficient and electrochemical migration rate.

Method used

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  • Lithium isotope separation method and device
  • Lithium isotope separation method and device
  • Lithium isotope separation method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The nickel-cobalt-manganese ternary lithium, lithium-germanium-phosphorus-sulfur solid-state electrolyte, and Super-P were weighed in a weight ratio of 75:23:2, and ball-milled for 30 minutes to prepare a composite anode material.

[0033] Weigh 100mg of composite anode material and 800mg of lithium-germanium-phosphorus-sulfur solid-state electrolyte, and place them in a stainless steel mold with a diameter of 1cm in turn. Apply a pressure of 200Mpa for 10min to make the composite anode material and solid-state electrolyte tightly combined. Take a 2mm-thick graphite pole piece As the cathode, it was placed on the other side of the lithium-germanium-phosphorus-sulfur solid electrolyte to assemble a solid-state electrochemical cell. In addition, copper foil and aluminum foil with a thickness of 50 μm were attached to the cathode current collector and the anode current collector in turn. The pressure of 50Mpa was applied for 10min to make each component tightly combine.

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Embodiment 2

[0039] Lithium cobalt oxide, lithium phosphorus sulfur chloride solid electrolyte and vapor-grown carbon fiber were weighed in a weight ratio of 70:27:3, and ball-milled for 10 minutes to prepare a composite anode material.

[0040] Weigh 11mg composite anode material and 120mg lithium phosphorus sulfur chloride solid electrolyte, place them in a stainless steel mold with a diameter of 1cm in turn, apply a pressure of 370Mpa for 20min, make the composite anode material and solid electrolyte closely combine together, take 2.5mg silver electrode piece as The cathode is placed on the other side of the lithium-phosphorus-sulfur-chlorine solid electrolyte to assemble a solid-state electrochemical cell. The solid-state electrochemical cell is placed in a stainless steel shell of a 2032 button battery, and the pressure of 5Mpa is maintained to make the components tightly combined.

[0041] A voltage of 3.0 V was applied across the solid-state electrochemical cell for 10 min using a Gamr...

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Abstract

The invention discloses a lithium isotope separation method and device, and the separation method comprises the following steps: sequentially superposing a composite anode material, a solid electrolyte and a cathode pole piece material together to assemble a solid electrochemical cell; applying a certain voltage to the two ends of the electrochemical cell and maintaining for a certain time; and taking out the cathode pole piece, and dissolving the lithium isotope deposited on the surface of the cathode in an acid solution. The separation device comprises a solid-state electrochemical cell and a power supply device, wherein the solid-state electrochemical cell is assembled by sequentially overlapping a composite anode material, a solid-state electrolyte and a cathode pole piece, and the power supply device is connected with an anode and a cathode of the electrochemical cell. Different from separation processes of a solvent extraction method and an ion exchange method, the method has the advantages that firstly, mercury and an organic solvent are not needed, and environmental pollution and separation cost are reduced; 2, compared with other classification processes, the lithium isotope separation coefficient is remarkably improved; 3, the separation process is simple to operate, the production efficiency can be greatly improved, and continuous industrial production can be realized.

Description

technical field [0001] The invention belongs to the technical field of isotope separation, and in particular relates to a lithium isotope separation method and device. Background technique [0002] There are two stable lithium isotopes in nature, 6 Li and 7 Li, accounting for 7.59% and 92.41% of natural lithium elements, respectively. Both lithium isotopes have important applications in the field of nuclear energy engineering. For example, in order to ensure the safe operation of nuclear power plants, the purity of more than 99.995% 7 Li can be used as a pH control agent in the cooling system of pressurized water reactors, used in the fourth generation thorium-based molten salt nuclear reactors 7 LiF-BeF 2 -ThF 4 Molten salt system as fuel and coolant, this reactor also requires high purity (about 99.99%) 7 Li to prevent the formation of tritium. On the other hand, controlled nuclear fusion, known as an "artificial sun," usually requires a purity greater than 30%. 6...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D59/38
CPCB01D59/38Y02E60/10
Inventor 张宗良刘芳洋蒋良兴贾明
Owner CENT SOUTH UNIV
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