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Recycling method of lithium iron phosphate battery, obtained LiFePO4/RGO composite material and application

A technology of lithium iron phosphate battery and recovery method, applied in the field of lithium iron phosphate battery recovery and LiFePO4/RGO composite material, can solve the problems of large waste liquid generation, high energy consumption, environmental pollution of residual acid liquid, etc. Effects of efficiency, small particle size, excellent rate capacity

Pending Publication Date: 2022-07-15
武汉思维得科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The potential problem of hydrometallurgical leaching is the serious pollution of the environment caused by residual acid
Therefore, although solid-phase calcination has been adopted to regenerate LiFePO 4 materials or acid leaching to recover precious metals in waste LIBs, but the current problems of high energy consumption and waste liquid generation need to be solved urgently

Method used

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  • Recycling method of lithium iron phosphate battery, obtained LiFePO4/RGO composite material and application
  • Recycling method of lithium iron phosphate battery, obtained LiFePO4/RGO composite material and application
  • Recycling method of lithium iron phosphate battery, obtained LiFePO4/RGO composite material and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Waste LiFePO that will be provided 4 The battery was first discharged to 2.0V in NaCl solution for 1 day, and then disassembled to obtain a cathode plate, an anode plate, an aluminum casing, an electrolyte and a separator in a sealed box. The positive electrode was soaked in NaOH solution for 7 h. Then the black powder was dried, ball milled and sieved to obtain waste LiFePO 4 Material.

[0037] 2) Add waste LiFePO to 30ml of deionized water at a molar ratio of 1:0.2:2:1 4 powder, LiOH, l-ascorbic acid and sodium dodecylbenzenesulfonate (SDBS, C 18 H 29 SO 3 Na). After stirring for 3 hours, the solution was transferred to the autoclave.

[0038] 3) Before the hydrothermal reaction, the waste graphite anode regenerated graphene oxide is added to the mixture, and the reactor is heated to 150 degrees Celsius for 5 hours to obtain product particles.

Embodiment 2

[0040] 1) Waste LiFePO that will be provided 4 The battery was first discharged to 2.0V in NaCl solution for 1 day, and then disassembled to obtain a cathode plate, an anode plate, an aluminum casing, an electrolyte and a separator in a sealed box. The positive electrode was soaked in NaOH solution for 7 h. Then the black powder was dried, ball milled and sieved to obtain waste LiFePO 4 Material.

[0041] 2) Add waste LiFePO to 30ml of deionized water at a molar ratio of 1:0.3:3:1 4 powder, LiOH, l-ascorbic acid and sodium dodecylbenzenesulfonate (SDBS, C 18 H 29 SO 3 Na). After stirring for 3 hours, the solution was transferred to the autoclave.

[0042] 3) Before the hydrothermal reaction, the waste graphite anode regenerated graphene oxide is added to the mixture, and the reactor is heated to 160 degrees Celsius for 6 hours to obtain product particles.

Embodiment 3

[0044] 1) Waste LiFePO that will be provided 4 The battery was first discharged to 2.0V in NaCl solution for 1 day, and then disassembled to obtain a cathode plate, an anode plate, an aluminum casing, an electrolyte and a separator in a sealed box. The positive electrode was soaked in NaOH solution for 6 h. Then the black powder was dried, ball milled and sieved to obtain waste LiFePO 4 Material.

[0045] 2) Add waste LiFePO to 30ml of deionized water at a molar ratio of 1:0.2:2:1 4 powder, LiOH, l-ascorbic acid and sodium dodecylbenzenesulfonate (SDBS, C 18 H 29 SO 3 Na). After stirring for 2 hours, the solution was transferred to the autoclave.

[0046] 3) Before the hydrothermal reaction, the waste graphite anode regenerated graphene oxide is added to the mixture, and the reactor is heated to 180 degrees Celsius for 8 hours to obtain product particles.

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Abstract

The invention provides a recycling method of a lithium iron phosphate battery, an obtained LiFePO4 / RGO composite material and application. The recycling method comprises the following steps: (1) discharging and disassembling the waste lithium iron phosphate battery, sorting positive plates, pretreating the positive plates, and drying to obtain positive material powder; (2) adding the LiFePO4 positive electrode material powder, LiOH, a reducing agent and a surfactant into deionized water, and stirring for 1-3 hours to obtain a mixture; and (3) adding the waste graphite anode regenerated graphene oxide into the mixture, heating the mixture to 120-200 DEG C, heating for 5-8 hours, and carrying out hydrothermal reaction to obtain the LiFePO4 / RGO composite material. According to the method, LiFePO4 is recycled by adopting a new closed-loop regeneration process, meanwhile, reduced graphene oxide RGO is formed by reducing graphene oxide, and lithium is supplemented by adopting hydrothermal, so that the high-performance LiFePO4 / RGO composite material is re-synthesized.

Description

technical field [0001] The invention relates to the field of lithium ion battery recycling and reuse; in particular, to a recovery method of lithium iron phosphate battery and obtained LiFePO 4 / RGO composites and applications. Background technique [0002] With the continuous development of technology, the demand for power batteries for electronic products such as digital cameras, notebook computers and electric vehicles has increased significantly. It is predicted that by 2020, the global lithium-ion battery (LIBs) market size will approach $32 billion, ushering in a booming electronic era. In recent years, LiFePO 4 Batteries are widely used in electric vehicles and hybrid electric vehicles (HEVs) due to their advantages of high power, stable cycle performance, low cost, good environmental compatibility, high safety, and good thermal stability. With the rapid development of electric vehicles and hybrid vehicles, it is expected that by 2020, LiFePO 4 The battery will us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCH01M10/54
Inventor 刘建文王石泉符芳铭周来
Owner 武汉思维得科技有限公司
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