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Composite positive electrode material and preparation method and application thereof

A composite positive electrode material and composite material technology, which is applied in the field of composite positive electrode materials and its preparation, can solve problems such as limited cycle performance, collapse of battery cycle structure, and limited material performance, and achieve good cycle stability and controllable morphology and structure , the effect of enriching the pore structure

Active Publication Date: 2022-05-10
INST OF CHEM ENG GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, because the specific surface area is too large, it is easy to collapse in the battery cycle structure, resulting in limited cycle performance, while when the specific surface area is small, the material performance is limited due to the small sulfur loading.

Method used

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  • Composite positive electrode material and preparation method and application thereof
  • Composite positive electrode material and preparation method and application thereof
  • Composite positive electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] A kind of composite cathode material, its preparation method comprises the following steps:

[0089] 1) Preparation of Fe-MOF material: 3.2g Fe(NO 3 ) 3 ·6H 2 O and 2.0g 2-aminoterephthalic acid were added to 150mL N,N-dimethylformamide (DMF), stirred for 30min until completely dissolved and transferred to a 200mL reactor, heated at 150°C for 20h, cooled, Filtration, multiple washings and filtration drying yielded an iron-based metal-organic framework material (referred to as Fe-MOF material, ie yellow-brown MIL-53).

[0090] 2) Activation of Fe-MOF material: immerse Fe-MOF material in methanol solution and stir for 16 hours to activate. During this period, the methanol solution needs to be changed three times, and then placed in 100°C for 6 hours to obtain activated Fe-MOF material.

[0091] 3) Fe 3 o 4 Preparation of @C material: Mix 0.6g of activated Fe-MOF material, 2.4g KCl and 3.6g LiCl, add 2mL of water, and grind thoroughly for 0.5h to obtain a uniform mixe...

Embodiment 2

[0094] A kind of composite cathode material, its preparation method comprises the following steps:

[0095] 1) Preparation of Fe-MOF material: 3.2g Fe(NO 3 ) 3 ·6H 2 O and 2.0g 2-aminoterephthalic acid were added to 150mL N,N-dimethylformamide (DMF), stirred for 30min until completely dissolved and transferred to a 200mL reactor, heated at 150°C for 20h, cooled, Filtration, multiple washings and filtration drying yielded an iron-based metal-organic framework material (referred to as Fe-MOF material, ie yellow-brown MIL-53).

[0096] 2) Activation of Fe-MOF material: immerse Fe-MOF material in methanol solution and stir for 16 hours to activate. During this period, the methanol solution needs to be changed three times, and then placed in 100°C for 6 hours to obtain activated Fe-MOF material.

[0097] 3) Fe 3 o 4 Preparation of @C material: Mix 0.6g of activated Fe-MOF material, 2.4g KCl and 3.6g LiCl, add 2mL of water, and grind thoroughly for 0.5h to obtain a uniform mixe...

Embodiment 3

[0100] A kind of composite cathode material, its preparation method comprises the following steps:

[0101] 1) Preparation of Fe-MOF material: 3.2g Fe(NO 3 ) 3 ·6H 2 O and 2.0g 2-aminoterephthalic acid were added to 150mL N,N-dimethylformamide (DMF), stirred for 30min until completely dissolved and transferred to a 200mL reactor, heated at 150°C for 20h, cooled, Filtration, washing, and filtration-drying yielded an iron-based metal organic framework material (referred to as Fe-MOF material, ie yellow-brown MIL-53).

[0102] 2) Activation of Fe-MOF material: immerse Fe-MOF material in methanol solution and stir for 16 hours to activate. During this period, the methanol solution needs to be changed three times, and then placed in 100°C for 6 hours to obtain activated Fe-MOF material.

[0103] 3) Fe 3 o 4 Preparation of @C material: Mix 0.6g of activated Fe-MOF material with 6.0g LiCl, add 2mL of water, grind thoroughly for 0.5h to obtain a uniform mixed slurry; dry the mixe...

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Abstract

The invention discloses a composite positive electrode material and a preparation method and application thereof. The composite positive electrode material comprises sulfur, porous carbon spheres and iron oxide, the sulfur and the iron oxide are loaded on the porous carbon spheres; the porous carbon spheres are stacked into a layered structure. The preparation method comprises the following steps: 1) immersing an iron-based metal organic framework material in an activating solution, and carrying out solvent exchange to obtain an activated iron-based metal organic framework material; (2) mixing the activated iron-based metal organic framework material, fused salt and water, and carrying out reduction reaction under a calcining condition to obtain a composite material of iron oxide and carbon; and 3) mixing the composite material of the iron oxide and the carbon with sulfur, and carrying out heat treatment to obtain the composite positive electrode material. The composite positive electrode material has the advantages of excellent rate capability, excellent high-temperature cycle performance, good stability, small capacity fading and the like, and is suitable for practical popularization and application.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a composite positive electrode material and a preparation method and application thereof. Background technique [0002] With the rapid development and widespread use of portable electronic devices, safe, efficient, and low-cost secondary batteries have become a hot spot in electrochemical energy storage research. Lithium-sulfur batteries are considered to be one of the most potential secondary battery systems due to their high theoretical energy density (2600Wh / kg), abundant sulfur resources, low price, and environmental friendliness. The study found that the composite material composed of carbon materials, metal oxygen / sulfide and sulfur as an electrode can overcome the difficulties of the existing sulfur element and the non-conductivity of the end product of discharge, the "shuttle effect" of lithium polysulfide, and the volume effect of the sulfur positive electrode. prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/525H01M4/62
CPCH01M4/366H01M4/525H01M4/38H01M4/625Y02E60/10
Inventor 赵一芳庞浩吴炼廖兵
Owner INST OF CHEM ENG GUANGDONG ACAD OF SCI
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