Recycling method for lithium iron manganese phosphate positive electrode material for battery

A technology of lithium iron manganese phosphate and battery cathode, which is applied in the field of recycling and utilization of cathode materials of lithium iron manganese phosphate batteries, can solve the problems of low self-discharge rate, low cost, insufficient rate performance, etc., so as to avoid pollution and shorten service life. Effect

Active Publication Date: 2018-11-02
安徽南都华铂新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] LiFePO 4 It is considered to be one of the positive electrode materials for lithium-ion batteries with development prospects due to its low price, abundant output, and good cycle stability. However, due to the use of only 3.2V, insufficient rate performance, and low conductivity, it cannot meet high-energy power requirements. Battery requirements limit its further development
LiMnPO 4 Compared to LiFePO 4 The cycle stability is relatively weak, but it has the characteristics of high voltage (3.8V), low self-discharge rate, mature materials, and low cost.

Method used

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  • Recycling method for lithium iron manganese phosphate positive electrode material for battery

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Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the positive electrode material of lithium manganese iron phosphate battery is first dissolved in sodium persulfate solution, and the oxidative acidification slurry is obtained through oxidation reaction, and then the lithium-rich solution and ferromanganese slag are obtained through filtration, and the ferromanganese slag is manganese oxide and ferric phosphate The mixture of lithium-rich solution is removed to obtain lithium-rich purification solution, and the lithium-rich purification solution is precipitated by sodium carbonate solution to obtain lithium carbonate; ferromanganese slag is roasted with sodium hydroxide solid at a roasting temperature of 450 ° C, and the obtained roasted material is dissolved in water to obtain water-soluble The roasting material, the water-soluble roasting material is filtered to obtain sodium manganate solution and iron phosphate; the sodium manganate solution is added with reducing agent manganese trioxide ...

Embodiment 2

[0032] Such as figure 1 As shown, the positive electrode material of lithium manganese iron phosphate battery is first dissolved in sodium persulfate solution, and the oxidative acidification slurry is obtained through oxidation reaction, and then the lithium-rich solution and ferromanganese slag are obtained through filtration, and the ferromanganese slag is manganese oxide and ferric phosphate The mixture of lithium-rich solution is obtained by removing impurities, and the lithium-rich purified solution is precipitated by sodium carbonate solution to obtain lithium carbonate; the ferromanganese slag is roasted with sodium hydroxide solid, the roasting temperature is 500 ° C, and the obtained roasted material is dissolved in water to obtain water-soluble The roasting material, the water-soluble roasting material is filtered to obtain sodium manganate solution and iron phosphate; the sodium manganate solution is added with reducing agent manganese trioxide to obtain manganese d...

Embodiment 3

[0036] Such as figure 1 As shown, the positive electrode material of lithium manganese iron phosphate battery is first dissolved in sodium persulfate solution, and the oxidative acidification slurry is obtained through oxidation reaction, and then the lithium-rich solution and ferromanganese slag are obtained through filtration, and the ferromanganese slag is manganese oxide and ferric phosphate The mixture of lithium-rich solution is obtained by removing impurities, and the lithium-rich purified solution is precipitated by sodium carbonate solution to obtain lithium carbonate; the ferromanganese slag is roasted with sodium hydroxide solid, the roasting temperature is 500 ° C, and the obtained roasted material is dissolved in water to obtain water-soluble The roasting material, the water-soluble roasting material is filtered to obtain sodium manganate solution and iron phosphate; the sodium manganate solution is added with reducing agent manganese trioxide to obtain manganese d...

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Abstract

The invention discloses a recycling method for a lithium iron manganese phosphate positive electrode material for a battery and relates to the technical field of recycling of waste power batteries. The method comprises the steps of firstly dissolving a lithium iron manganese phosphate positive electrode material for a battery into an oxidizing acid solution, carrying out oxidizing reaction to obtain oxidized and acidified slurry and then filtering to obtain a lithium-rich solution and ferromanganese slag, wherein the ferromanganese slag is a mixture of manganese oxide and iron phosphate; carrying out purification on the lithium-rich solution to obtain a lithium-rich purified liquid and carrying out sodium carbonate precipitation on the lithium-rich purified liquid to obtain lithium carbonate; adding sodium hydroxide to the ferromanganese slag for calcination, adding water to the obtained calcined material for dissolving to obtain a water-soluble calcined material, filtering the water-soluble calcined material to obtain a sodium manganate solution and the iron phosphate; and adding a reducing agent to the sodium manganate solution and carrying out redox reaction to obtain manganesedioxide. According to the recycling method, recovery of all components of lithium iron manganese phosphate is achieved, and lithium carbonate, iron phosphate and manganese oxide products are finally obtained.

Description

Technical field: [0001] The invention relates to the technical field of recycling waste power batteries, in particular to a method for recycling positive electrode materials of lithium manganese iron phosphate batteries. Background technique: [0002] LiFePO 4 It is considered to be one of the positive electrode materials for lithium-ion batteries with development prospects due to its low price, abundant output, and good cycle stability. However, due to the use of only 3.2V, insufficient rate performance, and low conductivity, it cannot meet high-energy power requirements. Battery requirements limit its further development. LiMnPO 4 Compared to LiFePO 4 The cycle stability is relatively weak, but it has the characteristics of high voltage (3.8V), low self-discharge rate, mature materials, and low cost. According to the required characteristics of the power battery, Fe and Mn are combined, and Mn-doped LiFePO is used 4 As a lithium ion battery cathode material - lithium ...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 朱建楠
Owner 安徽南都华铂新材料科技有限公司
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