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Titanium-doped regenerated lithium iron phosphate cathode material and preparation method thereof, and application thereof

A positive electrode material, lithium iron phosphate technology, applied in the field of titanium-doped regenerated lithium iron phosphate positive electrode material and its preparation, can solve the problems of large capacity decay rate and small discharge capacity of lithium iron phosphate, and achieve high compaction density and easy The effect of magnification and uniform particle distribution

Inactive Publication Date: 2019-01-08
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in order to solve the technical problems that the lithium iron phosphate positive electrode material regenerated by the existing method has a small discharge capacity and a large capacity decay rate, a titanium-doped regenerated lithium iron phosphate positive electrode material and Its preparation method and application to realize large-scale recycling of waste lithium iron phosphate battery cathode materials

Method used

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  • Titanium-doped regenerated lithium iron phosphate cathode material and preparation method thereof, and application thereof
  • Titanium-doped regenerated lithium iron phosphate cathode material and preparation method thereof, and application thereof
  • Titanium-doped regenerated lithium iron phosphate cathode material and preparation method thereof, and application thereof

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Embodiment 1

[0036] This embodiment provides a method for preparing a titanium-doped regenerated lithium iron phosphate positive electrode material, comprising the following steps:

[0037] S1: After heating the positive electrode sheet separated from the waste lithium-ion battery under superheated steam at 400°C, the positive electrode material of the lithium iron phosphate battery is separated from the positive electrode current collector, and then the positive electrode material of the lithium iron phosphate battery is dried and ground , After sieving through a 200-mesh sieve, the recycled lithium iron phosphate battery positive electrode material is obtained;

[0038] S2: After adding lithium carbonate, iron nitrate, tetrabutyl titanate, ammonium dihydrogen phosphate, and citric acid to the positive electrode material of the recovered lithium iron phosphate battery, the doped product is obtained. The lithium carbonate, iron nitrate, and tetrabutyl titanate The molar ratio of lithium, i...

Embodiment 2

[0049] This embodiment provides a method for preparing a titanium-doped regenerated lithium iron phosphate positive electrode material, comprising the following steps:

[0050] S1: After heating the positive electrode sheet separated from the waste lithium-ion battery under superheated steam at 350°C, the positive electrode material of the lithium iron phosphate battery is separated from the positive electrode current collector, and then the positive electrode material of the lithium iron phosphate battery is dried and ground , After sieving through a 200-mesh sieve, the recycled lithium iron phosphate battery positive electrode material is obtained;

[0051] S2: After adding lithium hydroxide, ferrous oxalate, titanium dioxide, diammonium hydrogen phosphate, and sucrose to the positive electrode material of the recovered lithium iron phosphate battery, the doped product is obtained. The lithium hydroxide, ferrous oxalate, titanium dioxide, dihydrogen phosphate The molar ratio...

Embodiment 3

[0059] This embodiment provides a method for preparing a titanium-doped regenerated lithium iron phosphate positive electrode material, comprising the following steps:

[0060] S1: After heating the positive electrode sheet separated from the waste lithium-ion battery under superheated steam at 600°C, the positive electrode material of the lithium iron phosphate battery is separated from the positive electrode current collector, and then the positive electrode material of the lithium iron phosphate battery is dried and ground , After sieving through a 500-mesh sieve, the positive electrode material of the lithium iron phosphate battery is recovered;

[0061] S2: After adding lithium oxalate, iron oxide, titanium tetrachloride, phosphoric acid, and glucose to the positive electrode material of the recovered lithium iron phosphate battery, the doped product is obtained. The lithium oxalate, iron oxide, titanium tetrachloride, and lithium in phosphoric acid The molar ratio of iro...

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Abstract

The invention relates to a preparation method of a titanium doped regenerated lithium iron phosphate cathode material, which comprises the following steps: after adding lithium source, iron source, titanium source, phosphorus source and carbon source into the recovered lithium iron phosphate battery cathode material, obtaining doped product, lithium source, iron source, titanium source and the molar ratio of lithium, iron, titanium and phosphorus elements in the phosphorus source is 1: 0.9; 0.99:0.1-0.01: 1; Adding a solvent medium into the precursor, and uniformly mixing to obtain an intermediate; A regenerated cathode material is prepared by calcining the intermediate in an inert atmosphere. The titanium doped regenerated lithium iron phosphate cathode material of the invention is used as a cathode active material in a lithium ion battery, and has excellent electrochemical activity and cycle stability.

Description

technical field [0001] The invention relates to a titanium-doped regenerated lithium iron phosphate positive electrode material and a preparation method and application thereof, belonging to the technical field of recovery and regeneration of waste battery materials. Background technique [0002] With the country's investment and promotion of new energy vehicles, the output of electric vehicle power batteries has increased significantly, and the ensuing problem is the recycling and disposal of waste power batteries. The solution to this problem is not only conducive to environmental protection, but also It is beneficial to the recycling of resources and has great practical significance. [0003] Since lithium iron phosphate (LiFePO 4 ) The power battery has stable performance and has been widely used in recent years. However, since the waste lithium iron phosphate material does not contain precious metals such as cobalt and nickel, its recycling value is relatively low, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525H01M10/54H01M2004/021H01M2004/028Y02E60/10Y02W30/84
Inventor 赵光金王放放陈重学蒲想军张雪盈
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST