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Electrochemical lithium recovery method

An electrochemical and lithium recovery technology, applied in the field of energy materials and electrochemical lithium recovery, can solve the problems of high lithium recovery cost, surge in recovery cost, and low recovery efficiency, and achieve low cost, significant practical value, and realization of recycling. Effect

Active Publication Date: 2013-09-04
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
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Problems solved by technology

However, there are still problems such as low recovery efficiency and low purity, which need to be purified again, and the recovery cost has increased sharply
On the other hand, for LiFePO4 batteries that are widely used in electric vehicles or energy storage power sources, if the Fe and Al factors that are not of high value are still separated by wet methods in the past, and then lithium is re-precipitated, it will result in higher lithium recovery costs.

Method used

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Embodiment

[0020] Preparation of iron phosphate material:

[0021] 11.3g Fe(NO 3 ) 3 ·6H 2 O, 2.74gH 3 PO 4 Mix well, make 70ml aqueous solution, pour into 100ml Teflon-lined stainless steel reaction kettle, conduct hydrothermal reaction at 150°C for 24h, cool naturally to room temperature, remove all solvents to obtain precursor. Place the precursor in a drying oven at 60°C to dry to obtain the target product, iron phosphate.

[0022] figure 1 This is the SEM picture of the obtained ferric phosphate material. It can be seen from the picture that the material synthesized by this method has a uniform and regular spherical structure with a particle size of 2-3 μm. Each microsphere is composed of nanoparticles with a diameter of about 100 nm. .

[0023] Preparation of iron phosphate electrode:

[0024] Will figure 2 The iron phosphate material and acetylene black are mixed evenly according to the mass ratio of 9:1, and 1% polytetrafluoroethylene emulsion is added to make a uniform...

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Abstract

The invention discloses an electrochemical lithium recovery method. Lithium in a solution is enriched through an electrochemical process by iron phosphate (FePO4), and the obtained lithiated iron phosphate material undergoes heat treatment to prepare a lithium iron phosphate positive electrode material. The electrochemical method which is used to extract lithium has a high lithium extraction selectivity, and is not influenced by other ions in the solution, and the electrochemical product lithiated iron phosphate can be directly converted to the lithium iron phosphate material after processing. So the method is very suitable for the direct extraction of lithium from the ionic solution having low values, and has the advantages of simple process, easy control and low cost, substantial practical values and good application prospect.

Description

technical field [0001] The invention relates to a method for electrochemically recovering lithium and the reuse of lithium iron phosphate (LiFePO4) materials, belonging to the field of energy materials and technologies. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products such as notebook computers, mobile phones, and digital cameras due to their high specific capacity, long cycle life, wide operating temperature range, small self-discharge, and no memory effect. According to statistics, the global production of lithium-ion batteries exceeded 580 million in 2000, and the domestic production was about 100 million. In 2003, the global production reached 1.255 billion. In 2008, the output reached 2.71 billion. In 2010, the global production exceeded 3 billion. . With the development of economic technology and the development and utilization of global resources, lithium-ion batteries will become the main power source of electric ve...

Claims

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Application Information

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IPC IPC(8): C25C1/02H01M10/54
CPCY02W30/84Y02P10/20
Inventor 吴越贾蕗路裴锋伍发元田旭皮元丰毛荣军张员根
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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