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Preparation method of a hollow sandwich iron-based negative electrode material

A sandwich type, negative electrode material technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of limited improvement and limited performance improvement, and achieve the effect of improving conductivity, low cost, and improving electrochemical kinetics

Active Publication Date: 2021-02-19
轻工业化学电源研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the carbon layer can improve the physical properties of the iron-based material core, the improvement is limited, especially for the performance improvement of the larger-sized iron-based material core.

Method used

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  • Preparation method of a hollow sandwich iron-based negative electrode material
  • Preparation method of a hollow sandwich iron-based negative electrode material
  • Preparation method of a hollow sandwich iron-based negative electrode material

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preparation example Construction

[0024] The preparation method of the hollow sandwich iron-based negative electrode material of the present invention comprises the following steps: (a) dispersing the sulfonated polymer microspheres or fibers into the Fe-containing 3+ in the aqueous solution, heating and drying to obtain the first core-shell complex; (b) dispersing the first core-shell complex (ie sulfonated polymer @FeOOH) in a buffered aqueous solution containing trishydroxymethylaminomethane , add dopamine (DA) under stirring conditions and make it polymerize on the surface of the first core-shell complex to obtain a sandwich-type polymer complex (sulfonated polymer@FeOOH@PDA); (c) the sandwich The type polymer compound can be calcined in an inert gas atmosphere, or can be calcined with a volatile sulfur source, selenium source or phosphorus source in an inert gas atmosphere. By compounding iron elements on the surface of sulfonated polymer particles and then compounding polydopamine, a double-carbon layer ...

Embodiment 1

[0028] This embodiment provides a method for preparing a hollow sandwich iron-based negative electrode material, which includes the following steps:

[0029] (a) Ultrasonic dispersion of sulfonated polystyrene microspheres (SPS, 0.1 g, about 500 nm in diameter) into 200 mL of Fe(NO 3 ) 3 ·6H 2 O (0.54g) in an aqueous solution, and then use a water bath to heat the solution to 85°C and react for 30 minutes; centrifuge the solution, and wash with water and ethanol in turn; put the obtained red solid in an oven and dry it at 60°C for 24 SPS@FeOOH with core-shell structure was obtained in 1 hour;

[0030] (b) ultrasonically disperse the product (0.1 g) in step (a) in an aqueous buffer solution containing Tris (25 mM, trishydroxymethylaminomethane), and add dopamine (DA, 0.05 g) to the solution under stirring, Continue to stir and react at room temperature for 24 hours (during this period, DA polymerizes on the surface of SPS@FeOOH to generate polydopamine (PDA)); after the reac...

Embodiment 2

[0033] This embodiment provides a method for preparing a hollow sandwich-type iron-based negative electrode material, the preparation process of which is basically the same as that in Example 1, except that the sulfur powder is replaced with selenium powder during the calcining in step (c). Spherical C@FeSe@C composites with a hollow “sandwich” structure, whose electrochemical performance is shown in Figure 7 .

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Abstract

The invention relates to a method for preparing a hollow sandwich iron-based negative electrode material, which comprises the following steps: (a) dispersing sulfonated polymer microspheres or fibers into Fe-containing 3+ in an aqueous solution, heated for reaction, and dried to obtain the first core-shell complex; (b) disperse the first core-shell complex in a buffered aqueous solution containing trishydroxymethylaminomethane, add dopamine under stirring conditions and make performing a polymerization reaction on the surface of the first core-shell complex to obtain a sandwich-type polymer compound; (c) combining the sandwich-type polymer compound with a volatile sulfur source, selenium source or phosphorus source in an inert gas atmosphere It can be calcined. It has the characteristics of simple process, low cost, easy control of experimental conditions, and convenient realization; the chemical reagents used have low toxicity and will not cause serious burden to the environment.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium batteries, and relates to a method for preparing a negative electrode material, in particular to a method for preparing a hollow sandwich iron-based negative electrode material. Background technique [0002] As one of the most promising electrical energy storage devices, lithium-ion batteries have been developed to alleviate energy and environmental challenges. At present, commercial lithium-ion battery anode materials usually use carbon-based materials. Carbon-based materials have excellent cycle stability, but due to their low theoretical specific capacity, their performance improvement and application fields are greatly limited. Therefore, the development of new high-performance lithium-ion battery anode materials is of great significance to the improvement of the performance of lithium-ion batteries. Among many anode materials for lithium-ion batteries, iron-based (such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5805H01M4/581H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 邵杰陈宇曲群婷
Owner 轻工业化学电源研究所
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