Method for preparing cathode material-lithium iron phosphate of lithium ion battery by utilizing steel slag

A technology for lithium-ion batteries and cathode materials, which is applied to battery electrodes, circuits, electrical components, etc., to achieve the effects of quality assurance, uniform mixing, and obvious advantages

Inactive Publication Date: 2013-05-08
郑州德朗能电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: overcome the disadvantages of high cost and poor performance of lithium-ion battery cathode material LiFePO4 in the prior art, Provided is a method of using waste steel slag as the main raw material to prepare LiFePO4, a positive electrode material for lithium ion batteries. The method has low cost and energy consumption, simplified process, and the prepared positive electrode material has high charge and discharge capacity , Good cycle performance, can be widely used in industrial production

Method used

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  • Method for preparing cathode material-lithium iron phosphate of lithium ion battery by utilizing steel slag
  • Method for preparing cathode material-lithium iron phosphate of lithium ion battery by utilizing steel slag
  • Method for preparing cathode material-lithium iron phosphate of lithium ion battery by utilizing steel slag

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Embodiment 1

[0037] Embodiment one : Using steel slag to prepare lithium-ion battery cathode material LiFePO 4 method, including the following steps:

[0038] (1) Weigh 80 Kg of steel slag, crush it into a powder with a particle size of less than 100 mesh; weigh 4 Kg of glucose, add 10 Kg of water, stir and dissolve to obtain an aqueous glucose solution; add the aqueous glucose solution to the steel slag powder, put it into a mixer and stir evenly , to obtain the mixture; wherein the chemical composition of steel slag is shown in Table 1, the same below;

[0039] Table 1: Chemical composition of steel slag (mass fraction%)

[0040] Element CaO FeO Al 2 o 3 SiO 2 MgO MnO P 2 o 5 content 30-60 15-26 3-8 8-23 4-9 5-10 0.5-2

[0041] (2) Put the prepared mixture into a silicon carbide crucible, then put it into an industrial microwave oven, use microwaves to raise the temperature to 550°C at a rate of 10°C per minute, and keep it at this tempera...

Embodiment 2

[0046] Embodiment two : Using steel slag to prepare lithium-ion battery cathode material LiFePO 4 method, including the following steps:

[0047] (1) Weigh 80 Kg of steel slag, crush it into a powder with a particle size of less than 100 mesh; weigh 3 Kg of citric acid, add 8 Kg of water, stir and dissolve to obtain a citric acid aqueous solution; add the citric acid aqueous solution to the steel slag powder, and stir evenly to obtain Mixture;

[0048] (2) Put the prepared mixture into an alumina crucible, put it into an industrial microwave oven, and use microwaves to raise the temperature to 600°C at a rate of 8°C per minute, and keep it at this temperature for 12 minutes; Magnetic separation in a magnetic separation tube of / m to select 30Kg of steel slag extract;

[0049] (3) Add 100Kg of 30wt% dilute sulfuric acid solution to the steel slag extract, stir and react at 80°C for 4h; let it stand for 1h, then suction filter and wash to obtain the filtrate, add 6Kg hydrog...

Embodiment 3

[0053] Embodiment three : Using steel slag to prepare lithium-ion battery cathode material LiFePO 4 method, including the following steps:

[0054] (1) Weigh 90 Kg of steel slag, crush it into a powder with a particle size of less than 100 mesh; weigh 4 Kg of oxalic acid, add 10 Kg of water, stir and dissolve to obtain an aqueous oxalic acid solution; add the aqueous oxalic acid solution to the steel slag powder, and stir evenly to obtain a mixture;

[0055] (2) Put the prepared mixture into an alumina crucible, put it into an industrial microwave oven, use microwaves to raise the temperature to 600°C at a rate of 10°C per minute, and keep it at this temperature for 15 minutes; Magnetic separation in a magnetic separation tube with a strength of 55KA / m to select 40Kg of steel slag extract;

[0056] (3) Add 120Kg of 30wt% dilute sulfuric acid solution to the steel slag extract, stir and react at 80°C for 4h; let it stand for 1h, then suction filter and wash to obtain the fi...

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Abstract

The invention relates to a method for preparing a cathode material-lithium iron phosphate of a lithium ion battery by utilizing steel slag. The method comprises the steps as follows: mixing the steel slag with a water-soluble carbon source compound water solution, and carrying out microwave heat treatment, reduction and magnetic separation to obtain a steel slag extract; reacting the steel slag extract with a mixed solution of diluted sulfuric acid, hydrogen peroxide and phosphoric acid, and extracting to obtain a calcium-free steel slag filter cake; adding lithium carbonate and the water-soluble carbon source compound water solution into the filter cake to obtain a precursor; and carrying out microwave sintering on the precursor to obtain the cathode material-lithium iron phosphate. Part of conventional raw materials are replaced with the steel slag as raw materials, so that the cost can be reduced by more than 30% and the obtained product is good in cycle performance; the conventional processes of ball-milling, drying and the like are removed, so that the process and the control operation are simple, inert gas does not need to be used in the sintering process, harmful gas such as nitrogen oxide and the like is not generated, the pollution is avoided, and the environment is protected; and the method is widely suitable for industrial production.

Description

[0001] technical field [0002] The invention relates to a lithium ion battery positive electrode material, in particular to a lithium ion battery positive electrode material LiFePO prepared by using steel slag through microwave heat treatment. 4 Methods. Background technique [0003] With the rapid development of my country's national economy, the contradiction of resource shortage is becoming more and more prominent, and the environmental pressure is increasing. Vigorously developing circular economy and improving resource utilization is an inevitable way to solve the current resource and environmental constraints on economic development in our country. It is necessary to vigorously improve the comprehensive utilization of primary resources and at the same time develop and utilize secondary resources. Blast furnace slag is an industrial solid waste, which is the slag discharged from the blast furnace ironmaking process, also known as blast furnace slag. There are many l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58
CPCY02E60/12Y02E60/10
Inventor 刘新保贾晓林陈晨蔡俊明
Owner 郑州德朗能电池有限公司
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