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Method for preparing lithium iron phosphate positive electrode material from waste lithium iron phosphate battery

A lithium iron phosphate battery, lithium iron phosphate technology, applied in battery electrodes, lithium storage batteries, positive electrodes and other directions, can solve the problems of low lithium leaching rate, non-compliance with environmental protection requirements, excessive slag amount, etc., to achieve high purity, The effect of high product utilization and good performance

Active Publication Date: 2020-04-14
宁夏百川新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that the lithium leaching rate is not high, and the amount of slag is too large at the same time, which does not meet the requirements of environmental protection.

Method used

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  • Method for preparing lithium iron phosphate positive electrode material from waste lithium iron phosphate battery
  • Method for preparing lithium iron phosphate positive electrode material from waste lithium iron phosphate battery
  • Method for preparing lithium iron phosphate positive electrode material from waste lithium iron phosphate battery

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Effect test

Embodiment 1

[0023] A method for preparing a lithium iron phosphate cathode material from a waste lithium iron phosphate battery, the specific production steps are as follows:

[0024] The first step: acid leaching, take 20g of lithium iron phosphate, copper and aluminum impurities, and negative electrode powder obtained from the waste lithium iron phosphate battery after discharge crushing and screening, add 100ml of 0.1mol / L dilute sulfuric acid solution, and put it in a water bath The temperature was 40°C, leaching for 2 hours, wherein the volume ratio of liquid to solid was 2:1, and the liquid was filtered to obtain the first solution after immersion, and the metal components in the leaching solution were shown in Table 1;

[0025]

[0026] Analysis results of each component in Table 1 implementation case 1

[0027] The second step: remove copper, add iron powder with a copper content of 0.8 times to the first solution, wherein the reaction temperature is 30°C, the stirring time is ...

Embodiment 2

[0033]A method for preparing a lithium iron phosphate cathode material from a waste lithium iron phosphate battery, the specific production steps are as follows:

[0034] The first step: acid leaching, take 1000g of lithium iron phosphate, copper and aluminum impurities, and negative electrode powder obtained from waste lithium iron phosphate batteries after discharge, crushing and screening, add 6000ml of 0.5mol / L dilute sulfuric acid solution, water bath The temperature is 60°C, leaching for 3 hours, wherein the volume ratio of liquid to solid is 5:1, and the liquid is filtered to obtain the first solution after soaking;

[0035] The second step: remove copper, add iron powder with a copper content of 0.9 times to the first solution, the reaction temperature is 55 ° C, the stirring time is 45 minutes, and the solution after copper removal is filtered to obtain the second solution;

[0036] Step 3: In addition to aluminum, gradually add 100ml of 1.5mol / L sodium sulfite dropwi...

Embodiment 3

[0041] A method for preparing a lithium iron phosphate cathode material from a waste lithium iron phosphate battery, the specific production steps are as follows:

[0042] The first step: acid leaching, take 1500g of lithium iron phosphate, copper and aluminum impurities, and negative electrode powder obtained from the waste lithium iron phosphate battery after discharge crushing and screening, add 6000ml1mol / L dilute sulfuric acid solution, water bath temperature 80 ℃, soak for 5 hours, wherein the volume ratio of liquid to solid is 8:1, after soaking, the liquid is filtered to obtain the first solution;

[0043] The second step: remove copper, add iron powder with 1 times the copper content to the first solution, the reaction temperature is 80°C, the stirring time is 60min, and the solution after copper removal is filtered to obtain the second solution;

[0044] Step 3: In addition to aluminum, gradually add 100ml of 2mol / L sodium sulfite dropwise to the second solution, whi...

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Abstract

The invention belongs to the field of lithium iron phosphate waste battery recovery, and particularly relates to a method for preparing a lithium iron phosphate positive electrode material from a waste lithium iron phosphate battery. The specific production steps are as follows: acid leaching, copper removal, aluminum removal, preparation of iron phosphate dihydrate, lithium precipitation and preparation of lithium iron phosphate. The method is simple in process, easy to operate and free of pollution, useful resources in the waste batteries are utilized to the maximum extent, and the product utilization rate is high; impurities such as aluminum, copper and calcium in the powder can be removed at low cost, various waste lithium iron phosphate batteries can be recycled, the application rangeis wide, and industrial large-scale production can be achieved conveniently; the recovered iron phosphate dihydrate and lithium phosphate are high in purity, the recovery rate of iron and phosphorusin the waste is greater than 95%, and the recovery rate of lithium is greater than 90%; all components of the waste lithium iron phosphate battery material are recycled, the prepared lithium iron phosphate is good in performance, and resource recycling is truly achieved.

Description

Technical field: [0001] The invention belongs to the field of recycling lithium iron phosphate waste batteries, and in particular relates to a method for preparing lithium iron phosphate cathode materials from waste lithium iron phosphate batteries. Background technique: [0002] Energy and the environment have become increasingly concerned issues. With the vigorous promotion of new energy vehicles in China, the production of new energy vehicles in my country in 2018 was 1.22 million, a year-on-year increase of 50%. Lithium iron phosphate batteries are widely used because of their advantages such as abundant raw material resources, low price, environmental friendliness, and high safety. With the extensive use of lithium iron phosphate batteries, the recycling of waste batteries has become a new task. [0003] At present, the methods for recovering lithium iron phosphate mainly include high-temperature solid-phase repair method and hydrometallurgical recovery method. The hi...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/052H01M10/54
CPCH01M4/5825H01M10/052H01M10/54H01M2004/028Y02E60/10Y02W30/84
Inventor 郑铁江蒋国强曹圣平陈电华唐义李国马俊华
Owner 宁夏百川新材料有限公司
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