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Device and method for coupling lithium extraction and hydrogen production of electrically-assisted photocatalytic lithium iron phosphate waste

A technology of lithium iron phosphate and photocatalysis, which is applied in battery recycling, electrolysis components, electrolysis process, etc., can solve the problems of acidic wastewater and waste residue, poor economy, etc., and achieve the effect of improving oxidation, simple steps, and obvious effect

Pending Publication Date: 2022-05-20
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, most of the research on the recycling of waste lithium iron phosphate batteries is carried out on the black powder of the positive electrode. The main methods include cascade utilization, fire recovery, wet recovery, high-temperature solid-phase repair, etc. The wet recovery with many advantages is the first choice for domestic lithium batteries. The technology mainly used by recycling companies, however, wet recycling is not economical and will produce acidic wastewater and waste residues

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  • Device and method for coupling lithium extraction and hydrogen production of electrically-assisted photocatalytic lithium iron phosphate waste
  • Device and method for coupling lithium extraction and hydrogen production of electrically-assisted photocatalytic lithium iron phosphate waste

Examples

Experimental program
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Effect test

Embodiment 1

[0061] The electrically assisted photocatalytic system of the present embodiment comprises an H-type electrocatalytic cell with a proton film and a photocatalytic system, the TiO 2 Nanomaterials are coated with TiO of anode electrode 5 by electrode deposition as photocatalytic materials 2 On the nanotube sheet; the solid-liquid ratio of 10g / ml of the broken waste lithium iron phosphate battery of the positive black powder mixture through the anode pool 10 into the anode pool 10, wherein the waste lithium iron phosphate battery cathode black powder particle size of 0.3mm; cathode pool 2 filled with hydrogen ion concentration of 0.1mol / L dilute sulfuric acid;

[0062]Turn on the UV lamp with a power of 40w, Open the additional DC power supply 8 is 1.5v DC voltage; under the illumination of ultraviolet light, the black powder of the waste iron phosphate battery in anode pool 1 is reacted to obtain iron phosphate precipitation and lithium ions released in the solution, the role of...

Embodiment 2

[0065] The electrically assisted photocatalytic system of the present embodiment comprises an H-type electrocatalytic cell with a proton film and a photocatalytic system, LaFeO 3 The nanomaterial as a photocatalytic material is coated on the FTO sheet of the anode electrode 5 in a rotating coating manner; the solid-liquid ratio of 8g / ml of the broken waste lithium iron phosphate battery cathode black powder aqueous mixture through the anode pool 10 through the anode pool 10 into the anode pool 1, wherein the waste lithium iron phosphate battery cathode black powder particle size of 1.0mm; cathode pool 2 filled with hydrogen ion concentration of 0.2mol / L dilute hydrochloric acid;

[0066] Turn on the xenon lamp with a power of 150w, Open the additional DC power supply 8 is a DC voltage of 0.5v; under the illumination of the light source, the black powder of the waste iron phosphate battery in anode pool 1 reacts to obtain iron phosphate precipitation and lithium ions released i...

Embodiment 3

[0068] The electrically assisted photocatalytic system of the present embodiment comprises an H-type electrocatalytic cell with a proton film and a photocatalytic system, the MOF-based catalyst UIO-66-NH 2The material is coated on the ITO sheet of the anode electrode 5 in a scraper coating manner; the solid-liquid ratio of 1g / ml of the crushed waste lithium iron phosphate battery cathode black powder aqueous mixture through the anode pool 10 through the anode pool 10 into the anode pool 1, wherein the waste lithium iron phosphate battery cathode black powder particle size of 0.8mm; cathode pool 2 filled with hydrogen ion concentration of 0.5mol / L dilute hydrochloric acid;

[0069] Using sunlight as a light source, Open the plus DC power supply 8 is 0.01v DC voltage; under the illumination of the light source, the black powder of the waste iron phosphate battery in anode pool 1 is reacted to obtain iron phosphate precipitation and lithium ions released in solution, the role of ...

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Abstract

The invention discloses an electrically assisted photocatalytic lithium iron phosphate waste lithium extraction and hydrogen production coupling device which comprises an H-shaped reaction tank, the H-shaped reaction tank comprises an anode tank and a cathode tank which are oppositely arranged, and a transverse through pipe is arranged between the anode tank and the cathode tank; a proton membrane which separates the anode tank from the cathode tank and only allows hydrogen ions to pass through is vertically arranged in the through pipe; electrodes are respectively arranged in the anode tank and the cathode tank, and a photocatalyst is loaded on the surface of the electrode of the anode tank; the anode tank is made of a light-transmitting material, and a light source is arranged outside the anode tank; a direct-current power supply is connected between the anode electrode and the cathode electrode through a wire; the invention also discloses a coupling method for extracting lithium and producing hydrogen from the electrically assisted photocatalytic lithium iron phosphate waste material, the coupling method is formed by combining a photocatalytic system and an electro-catalytic system, the use of acid liquor and alkali liquor in the recovery process of the lithium iron phosphate waste material is reduced, the raw material cost is saved, the equipment corrosion is avoided, the steps are simple, the lithium extraction efficiency is high, and the coupling method is green and environment-friendly.

Description

Technical field [0001] The present invention belongs to the field of waste recycling technology, relates to a device and method for extracting lithium from lithium iron phosphate waste, specifically to an electrically assisted photocatalytic lithium iron phosphate waste lithium extraction device and method coupled with hydrogen production. Background [0002] Lithium-ion batteries because of its many advantages, since the realization of commercialization, gradually replace the traditional secondary power supply, widely used in portable electronic equipment, electric vehicles, etc., in recent years, the application of new energy vehicles is showing good development prospects and value, which will come a large number of waste lithium iron phosphate batteries, decommissioned batteries in the storage process not only occupy a lot of land space, there is a certain pollution to the environment, and there is a security risk of electrolyte leakage and fire explosion. Therefore, how to ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B9/19C25B1/02C25B1/01C25B1/14C25B1/55
CPCC25B9/19C25B1/02C25B1/01C25B1/14C25B1/55Y02W30/84
Inventor 杨国锐李雨硕周欣宇丁书江延卫
Owner XI AN JIAOTONG UNIV
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