Recovering method of LiFePO4 positive electrode in spent lithium-ion battery

A technology of lithium-ion batteries and recovery methods, which is applied in the field of recovery of LiFePO4 positive electrodes in waste lithium-ion batteries, can solve problems such as the inability to separate Al and Cu, and achieve the effects of easy operation, low cost, and large-scale production

Inactive Publication Date: 2016-02-24
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Similarly, the patent cannot separate Al and Cu

Method used

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  • Recovering method of LiFePO4 positive electrode in spent lithium-ion battery
  • Recovering method of LiFePO4 positive electrode in spent lithium-ion battery
  • Recovering method of LiFePO4 positive electrode in spent lithium-ion battery

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Experimental program
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Effect test

Embodiment 1

[0028] LiFePO in a kind of waste lithium ion battery 4 The recovery method of positive pole comprises the steps:

[0029] S11, 176g of LiFePO 4 Cut the positive electrode material into pieces and pour it into 200ml of DMF solution, the DMF solution is made by mixing DMF and water at a volume ratio of 1:1;

[0030] S12, stirring rapidly to separate the black substance from the aluminum surface, the time is 30min, filter with a vacuum, after a period of time, the black mixture will be left on the filter paper;

[0031] S13, stir the filtrate rapidly again for 30min, then carry out vacuum filtration, repeat the steps of stirring and filtering until the black mixture has no precipitation or little precipitation during the stirring process;

[0032] S14, heat-treating the black mixture obtained by filtration to finally obtain LiFePO 4 and acetylene black mixture material.

[0033] Described heat treatment step comprises the steps:

[0034] S1. Vacuum drying: vacuum-dry the fil...

Embodiment 2

[0040] Except that temperature is 200 ℃ in heat treatment step S3, other is the same as embodiment 1;

Embodiment 3

[0042] Except that temperature is 250 ℃ in heat treatment step S3, other is the same as embodiment 1;

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Abstract

The invention discloses a recovering method of a LiFePO4 positive electrode in a spent lithium-ion battery. The method is characterized by including the steps of physically smashing the LiFePO4 positive electrode, dissolving powder in a DMF solution, conducting repeated stirring multiple times, heating a black mixture filtered out after the filtering step, and finally obtaining a LiFePO4 and acetylene black mixture material. The recovering method is low in cost, simple in process, low in cost, green, environmentally friendly and high in recovering efficiency.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to LiFePO in waste lithium ion batteries 4 Positive electrode recovery method. Background technique [0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses non-aqueous electrolyte solution, mainly including lithium metal battery and lithium ion battery. Lithium-ion batteries generally use lithium alloy metal oxide as the positive electrode material, graphite as the negative electrode material, and a non-aqueous electrolyte. The positive electrode material is mostly lithium iron phosphate. At present, there are mainly two methods for recycling lithium iron phosphate cathode materials in waste lithium-ion batteries: [0003] (1) Roasting method. In this method, the waste material is firstly baked at 450-600°C for 2-5 hours in an inert gas atmosphere, and then the powder product obtained by baking is mixed wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 宿世臣裴磊磊赵灵智
Owner SOUTH CHINA NORMAL UNIVERSITY
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