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Bismuth-based negative electrode for high-performance aqueous battery and preparation method of bismuth-based negative electrode

A high-performance, water-based technology, applied in electrode manufacturing, battery electrodes, active material electrodes, etc., can solve the problems of cumbersome and inefficient preparation process, poor electrode stability, low specific capacity per unit area, etc., and achieve high specific capacity per unit area, Simple equipment and good conductivity

Active Publication Date: 2021-08-13
陕西智航昱铠新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The whole preparation process is cumbersome and inefficient, and the prepared electrodes usually have problems of poor stability and low specific capacity per unit area

Method used

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  • Bismuth-based negative electrode for high-performance aqueous battery and preparation method of bismuth-based negative electrode
  • Bismuth-based negative electrode for high-performance aqueous battery and preparation method of bismuth-based negative electrode
  • Bismuth-based negative electrode for high-performance aqueous battery and preparation method of bismuth-based negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Soak the carbon cloth in concentrated nitric acid with a mass fraction of 98% for 1 hour, wash and dry it, and set it aside.

[0029] Step 2: Weigh 1 mg of USP grade xanthan gum powder and dissolve it in 20 ml of deionized water to form a xanthan gum gel.

[0030] Step 3: Measure 2.5ml of carbon nanotube dispersion with a mass fraction of 2%, add it into the prepared xanthan gum gel, and perform vigorous stirring and ultrasonication. Then use a soft brush to pick up the gel and spread it evenly on the carbon cloth in step 1.

[0031] Step 4: Arrange the carbon obtained in step 3 in the center of the heating temperature zone of the quartz tube of the tube furnace, and flush the quartz tube with high-purity argon to remove impurities such as air. The argon flow rate is 300 sccm, and the flushing time is 10 minutes.

[0032] Step 5: In an argon atmosphere with an argon gas flow rate of 100 sccm, the temperature of the tube furnace is adjusted step by step. In the...

Embodiment 2

[0036] Step 1: Soak the carbon cloth in concentrated nitric acid with a mass fraction of 98% for 2 hours, wash and dry it, and set it aside.

[0037] Step 2: Weigh 3mg USP grade xanthan gum powder and dissolve it in 60ml deionized water to form xanthan gum gel.

[0038] Step 3: Measure 7.5ml of carbon nanotube dispersion with a mass fraction of 2%, add it into the prepared xanthan gum gel, and perform vigorous stirring and ultrasonication. Then use a soft brush to pick up the gel and spread it evenly on the carbon cloth in step 1.

[0039] Step 4: Arrange the carbon obtained in step 3 in the center of the heating temperature zone of the quartz tube of the tube furnace, and flush the quartz tube with high-purity argon to remove impurities such as air. The argon flow rate is 350 sccm, and the flushing time is 15 minutes.

[0040] Step 5: In an argon atmosphere with an argon flow rate of 250 sccm, the temperature of the tube furnace is adjusted step by step. In the first stage,...

Embodiment 3

[0044] Step 1: Soak the carbon cloth in concentrated nitric acid with a mass fraction of 98% for 3 hours, wash and dry it, and set it aside.

[0045] Step 2: Weigh 5 mg of USP grade xanthan gum powder and dissolve it in 100 ml of deionized water to form a xanthan gum gel.

[0046] Step 3: Measure 12.5ml of carbon nanotube dispersion with a mass fraction of 2%, add it into the prepared xanthan gum gel, and perform vigorous stirring and ultrasonication. Then use a soft brush to pick up the gel and spread it evenly on the carbon cloth in step 1.

[0047] Step 4: Arrange the carbon obtained in step 3 in the center of the heating temperature zone of the quartz tube of the tube furnace, and flush the quartz tube with high-purity argon to remove impurities such as air. The argon flow rate is 400 sccm, and the flushing time is 20 minutes.

[0048] Step 5: In an argon atmosphere with an argon flow rate of 400 sccm, the temperature of the tube furnace is adjusted step by step. In the ...

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Abstract

The invention relates to a bismuth-based negative electrode for a high-performance aqueous battery and a preparation method of the bismuth-based negative electrode. Carbon cloth is used as a mechanical support body, a carbon nanotube dispersion liquid and xanthan gum gel are mixed to obtain a gelatinous substance, the carbon cloth is coated with the gelatinous substance, and high-temperature carbonization treatment is carried out to obtain porous conductive carbon; by taking BiI3 powder as a growth source and the porous conductive carbon as a growth substrate, a porous conductive carbon substrate with BiOI nanosheets is obtained by optimizing a heating program; and in an electrochemical three-electrode system, BiOI is topologically converted into a bismuth active substance in situ through a cyclic voltammetry electrochemical reduction method to obtain the high-performance bismuth-based self-supporting electrode. The bismuth-based negative electrode prepared by the preparation method disclosed by the invention is high in active substance loading capacity (27.5 mg cm <-2>) per unit area, good in electrode mechanical property and excellent in cycling stability, the area specific capacity reaches up to 2.17 mAh cm<-2>, and the capacity retention rate of the electrode after 5000 times of constant-current charging and discharging is 93.1%.

Description

technical field [0001] The invention belongs to a negative electrode for a battery and a preparation method thereof, and relates to a bismuth-based negative electrode for a high-performance water system battery and a preparation method thereof. Background technique [0002] Since the discovery of graphene materials in 2004, two-dimensional materials have attracted much attention due to their special electronic, mechanical and optical properties. In the ensuing more than ten years, related research on two-dimensional materials has been in the ascendant, a large number of theoretical and experimental results have been reported, and the types and related applications of two-dimensional materials have gradually increased. Due to their unique lattice structure and size characteristics, two-dimensional materials show excellent physical, chemical and mechanical properties, thus establishing their huge applications in nano-optoelectronic devices, energy storage, catalysis, biomedici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/38H01M4/66H01M10/36
CPCH01M4/0428H01M4/0438H01M4/38H01M4/663H01M10/36H01M2004/027Y02E60/10
Inventor 冯丽萍刘鹏飞何炅劼刘思维贾凌锋李泽天
Owner 陕西智航昱铠新材料有限责任公司