Iron disulfide positive electrode material, preparation method thereof and alkali metal ion battery

A technology of iron disulfide and positive electrode materials, which is applied in the direction of secondary batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of serious volume effect, low electronic conductivity, and short service life, so as to alleviate the volume effect and improve the conductivity , low cost effect

Inactive Publication Date: 2019-06-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide an iron disulfide positive electrode material and its preparation method and an alkali metal ion battery to s

Method used

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  • Iron disulfide positive electrode material, preparation method thereof and alkali metal ion battery
  • Iron disulfide positive electrode material, preparation method thereof and alkali metal ion battery
  • Iron disulfide positive electrode material, preparation method thereof and alkali metal ion battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0044] In this embodiment, the polymer monomer, dopant, and oxidant are pyrrole, sodium p-toluenesulfonate (TsONa), and ferric chloride, respectively. Double coating (material coating and electrode coating) is used to improve the electrochemical performance of iron disulfide. The polymerization of pyrrole is used for both coatings. The specific steps are as follows:

[0045] (1) Add iron disulfide, conductive polymer monomer solution and oxidizing agent solution successively to the polymer dopant solution, stir and then centrifuge to obtain the pre-product; conductive polymer monomer, polymer dopant, oxidizing agent and disulfide The molar ratio of iron is 1:2:3:10; the pre-product is alternately washed three times with absolute ethanol and deionized water, and dried in an oven at 80°C for later use;

[0046] (2) mixing and grinding the pre-product with a conductive additive and a binder, coating the obtained mixture on a copper foil and then drying it at 80° C. to obtain an e...

Embodiment 2

[0051] In this example, the polymer monomers are pyrrole and aniline, the dopant is sodium dodecylbenzenesulfonate (SDBS), the oxidant is ferric chloride, and the electrochemical performance of iron disulfide is improved by double coating The first chemical polymerization uses polypyrrole to coat the active material, and the second electrochemical polymerization uses polyaniline to coat the electrode sheet. The specific steps are as follows:

[0052] (1) Add iron disulfide, conductive polymer monomer solution and oxidizing agent solution successively to the polymer dopant solution, stir and then centrifuge to obtain the pre-product; conductive polymer monomer, polymer dopant, oxidizing agent and disulfide The molar ratio of iron is 1:0.1:2:100; the pre-product is alternately washed three times with absolute ethanol and deionized water, and dried in an oven at 80°C for later use;

[0053] (2) Mix and grind the pre-product with conductive additives and binders, coat the obtained...

Embodiment 3

[0058] In this example, the polymer monomers are pyrrole and thiophene, the dopant is sodium dodecylbenzenesulfonate (SDBS), the oxidizing agent is iron nitrate, and double coating is used to improve the electrochemical performance of iron disulfide. The first chemical polymerization uses polypyrrole to coat the active material, and the second electrochemical polymerization uses polythiophene to coat the electrode sheet. When coating the electrode sheet, no conductive additives are added, and the conductivity of the conductive polymer is used to meet the conductivity requirements. Specifically Proceed as follows:

[0059] (1) Add iron disulfide, conductive polymer monomer solution and oxidizing agent solution successively to the polymer dopant solution, stir and then centrifuge to obtain the pre-product; conductive polymer monomer, polymer dopant, oxidizing agent and disulfide The molar ratio of iron is 1:0.5:1.25:1; the pre-product is alternately washed three times with absol...

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Abstract

The invention discloses an iron disulfide positive electrode material, a preparation method thereof and an alkali metal ion battery, and belongs to the technical field of battery electrode materials.The preparation method comprises the following steps: firstly, coating the surfaces of iron disulfide particles with a conductive polymer in a chemical polymerization manner; uniformly coating the prepared material on a current collector; and coating the surface of an electrode piece with the conductive polymer. According to the invention, the method can remarkably improve the conductivity of theactive substance, alleviates the volume effect during lithium intercalation and deintercalation of iron disulfide, inhibits the problem of dissolution of the active substance in the charging and discharging process, and improves the cycle performance and the rate capability of the battery. The material is suitable for lithium, sodium and potassium ion batteries.

Description

technical field [0001] The invention relates to the technical field of battery electrode materials, in particular to a modified iron disulfide cathode material, a preparation method thereof, and an alkali metal ion battery. Background technique [0002] As a clean secondary energy storage device, lithium batteries are currently being vigorously promoted in many fields. Especially in the field of electric vehicles, the current demand for lithium batteries continues to rise, and lithium batteries with high energy density, typically NCA and NCM, are being used in large quantities. However, with the continuous development of this field, further requirements are put forward for battery performance, and energy density has become a very important indicator. Pyrite iron disulfide is an iron-sulfur compound that exists widely in nature. It is cheap and has a theoretical capacity of 894mAh / g, which is very in line with the development direction of high-energy-density lithium batterie...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/136H01M4/1397H01M4/36H01M4/58H01M4/62H01M10/052H01M10/054
CPCY02E60/10
Inventor 王丽平邹剑牛晓滨
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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