Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of recycling method of waste lithium iron phosphate battery

A technology of lithium iron phosphate battery and recycling method, which is applied in the direction of battery recycling, waste collector recycling, recycling technology, etc. It can solve the problems of high-salt wastewater containing impurities in the leachate, harsh process conditions, and complicated processes, and achieve good industrial application Foreground, avoiding high-salt wastewater, and the effect of short process

Active Publication Date: 2021-04-13
JINGMEN GEM NEW MATERIAL
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing waste lithium iron phosphate battery recycling technology combines hydrometallurgy and pyrometallurgy, and the lithium iron phosphate cathode material is obtained through wet leaching and pyrocalcination regeneration, and is calcined in a non-oxidizing atmosphere to prepare lithium iron phosphate products; The method of recovering lithium iron phosphate through pyrometallurgy needs to go through multiple processes such as ball milling, high-temperature calcination, re-ball milling, and re-sintering. The process conditions are harsh, energy consumption is large, and the process is complicated, so it has not been widely used; hydrometallurgy Utilize acid and reducing agent to leach iron and lithium simultaneously, then adjust the pH value of the leachate to 1.5-3, precipitate and separate out iron hydroxide to obtain iron oxide products, then adjust the pH value of the filtrate with alkali, and prepare lithium carbonate after removing impurities. The pyrometallurgical process is complex. However, the leaching of iron and lithium elements at the same time, and the further separation of iron and lithium elements often consume a large amount of acid solution, accompanied by the problems of impurities in the leaching solution and a large amount of high-salt wastewater

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 of the present invention provides a method for recycling waste lithium iron phosphate batteries, specifically:

[0034] Put the waste lithium iron phosphate battery into the salt water and discharge it to 0V, peel off the battery case and disassemble it to get the positive electrode, negative electrode and separator of the battery, then put the positive electrode, negative electrode and separator into the rotary kiln and bake at 800℃ for 8h, then bake The gas generated during the process is absorbed by the CaO aqueous solution to prevent the fluorine-containing gas from polluting the environment. The mass ratio of the battery waste to the calcium-containing powder is controlled at 300:1; Use 30-mesh, 60-mesh and 150-mesh ultrasonic vibrating sieves to separate in turn, sieve and remove metal materials such as aluminum foil and copper foil, and obtain lithium-containing positive electrode materials;

[0035] The lithium-containing positive electrode material...

Embodiment 2

[0038] Embodiment 2 of the present invention provides a method for recycling waste lithium iron phosphate batteries, specifically:

[0039]Put the waste lithium iron phosphate battery into salt water and discharge it to 0V, peel off the battery shell and disassemble it to get the positive electrode, negative electrode and separator of the battery, then put the positive electrode, negative electrode and separator into the rotary kiln and bake at 900 °C for 8 hours, then bake The gas generated during the process is absorbed by the CaO aqueous solution to prevent the fluorine-containing gas from polluting the environment. The mass ratio of the battery waste to the calcium-containing powder is controlled at 250:1; Use 30-mesh and 150-mesh ultrasonic vibrating sieves to separate in turn, sieve and remove metal materials such as aluminum foil and copper foil, and obtain lithium-containing positive electrode materials;

[0040] The lithium-containing positive electrode material and c...

Embodiment 3

[0043] Embodiment 3 of the present invention provides a method for recycling waste lithium iron phosphate batteries, specifically:

[0044] Put the waste lithium iron phosphate battery into salt water and discharge it to 0V, peel off the battery casing and disassemble it to get the positive electrode, negative electrode and separator of the battery, then put the positive electrode, negative electrode and separator into the rotary kiln and bake at 1000 °C for 9 hours, then bake The gas generated in the process passes through Ca(OH) 2 Absorb in aqueous solution to prevent fluorine-containing gas from polluting the environment. The mass ratio of battery waste to calcium-containing powder is controlled at 1000:1; Objective Ultrasonic vibrating sieve is used to separate, sieve and remove metal materials such as aluminum foil and copper foil, and obtain lithium-containing positive electrode materials;

[0045] The lithium-containing positive electrode material and calcium oxide are...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a recovery method of a waste lithium iron phosphate battery, comprising the following steps: step 1, discharging the waste lithium iron phosphate battery, peeling off the battery case and disassembling it to obtain a positive electrode, a negative electrode and a diaphragm of the battery; step 2, disassembling The positive electrode, negative electrode and diaphragm of the battery in step 1 are roasted, crushed and sieved to obtain a lithium-containing positive electrode material; in step 3, the lithium-containing positive electrode material and binder in step 2 are ball milled and mixed, and then pressed into blocks for calcination, Obtain the mixture; step 4, after mixing the mixture of step 3 with the reducing agent ball mill, carry out high-temperature vacuum reduction, vacuum distillation and vacuum condensation successively to obtain metal lithium; the present invention abandons the wet acid leaching adopted in the recycling process of conventional waste batteries, The method of high-temperature reduction and distillation avoids the generation of a large amount of high-salt wastewater; and the invention has short process flow, wide sources of chemical agents, simple process conditions, and improves the recovery efficiency of waste lithium iron phosphate batteries.

Description

technical field [0001] The invention belongs to the technical field of secondary recycling of lithium batteries, and in particular relates to a method for recycling waste lithium iron phosphate batteries. Background technique [0002] With the development of electric vehicles, lithium iron phosphate batteries have been widely used, and used lithium iron phosphate batteries contain a large amount of lithium metal. Recycling them can not only reduce the pollution of waste batteries to the environment, but also bring Certain economic benefits. [0003] The existing waste lithium iron phosphate battery recycling technology combines hydrometallurgy and pyrometallurgy, and the lithium iron phosphate cathode material is obtained through wet leaching and pyrocalcination regeneration, and is calcined in a non-oxidizing atmosphere to prepare lithium iron phosphate products; The method of recovering lithium iron phosphate through pyrometallurgy needs to go through multiple processes s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C22B7/00C22B26/12
CPCC22B7/001C22B26/12H01M10/54Y02W30/84Y02P10/20
Inventor 许开华王飞苏陶贵张云河余顺文
Owner JINGMEN GEM NEW MATERIAL