Bismuth sulfide electrode material with specific morphological structure and its application

An electrode material, bismuth sulfide technology, applied in the field of materials, can solve the problems of uneven particle size and agglomeration of bismuth sulfide, and achieve the effect of small impedance and large specific surface area

Active Publication Date: 2019-06-18
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0003] Bi 2 S 3 The synthesis methods are not the same, and the morphology of the obtained products is also different, which can be roughly divided into gas phase method, hydrothermal method, water bath method, biomolecular assisted synthesis method, etc. Among them, hydrothermal method is the more commonly used method, but The reaction of bismuth sulfide in the water phase is prone to uneven particle size and agglomeration

Method used

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  • Bismuth sulfide electrode material with specific morphological structure and its application
  • Bismuth sulfide electrode material with specific morphological structure and its application
  • Bismuth sulfide electrode material with specific morphological structure and its application

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preparation example Construction

[0034] The preparation method of the bismuth sulfide electrode material with specific morphology of the present invention comprises the following steps:

[0035] a, according to the molar ratio of bismuth and sulfur is 1:1~20, take bismuth nitrate pentahydrate and thioacetamide;

[0036] b. Add deionized water to thioacetamide, and ultrasonically disperse and dissolve for 20-40 minutes to obtain solution A;

[0037] c. Add 3 to 10 mL of hydrochloric acid with a concentration of 0.1 to 5 mol / L into bismuth nitrate pentahydrate, and stir to obtain a transparent and clear solution B;

[0038] d. Mix solution A and transparent clear solution B, react at 80-160°C for 1-16 hours, cool to room temperature, wash repeatedly with deionized water and absolute ethanol several times, and centrifuge at a rate of 7000 rpm , the separated product is dried and ground to obtain.

[0039] Further, in the preparation method of the above-mentioned bismuth sulfide electrode material with a specif...

Embodiment 1

[0048] The present embodiment bismuth sulfide electrode material is bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) and thioacetamide (CH 3 CSNH 2 ) is prepared as a precursor by a hydrothermal method, which specifically includes the following steps:

[0049] 1. Weigh Bi(NO 3 ) 3 ·5H 2 O and CH 3 CSNH 2 ;

[0050] Second, the CH 3 CSNH 2 Dissolve in 50mL deionized water, ultrasonically disperse for 30min until uniform, and obtain solution A;

[0051] Three, another Bi(NO 3 ) 3 ·5H 2 Dissolve O in 3-10 mL of hydrochloric acid with a concentration of 0.1-5 mol / L, and stir thoroughly to obtain a transparent and clear solution B;

[0052] 4. Mix the two solutions of A and B in a 100mL hydrothermal reaction kettle, and react at 100°C for 5 hours;

[0053] 5. Wash the cooled reaction product repeatedly with deionized water and absolute ethanol several times, and centrifuge at a rate of 7000 rpm;

[0054] 6. Dry the centrifuged sample in a vacuum oven at 60°C for ...

Embodiment 2

[0059] The present embodiment bismuth sulfide electrode material is bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) and thioacetamide (CH 3 CSNH 2 ) is prepared as a precursor by a hydrothermal method, which specifically includes the following steps:

[0060] 1. According to the molar ratio of bismuth and sulfur is 1:10, weigh 4.8576g Bi(NO 3 ) 3 ·5H 2 O and 0.7533g CH 3 CSNH 2 ;

[0061] Second, the CH 3 CSNH 2 Dissolve in 50mL deionized water, ultrasonically disperse for 30min until uniform, and obtain solution A;

[0062] Three, another Bi(NO 3 ) 3 ·5H 2 O was dissolved in 5 mL of hydrochloric acid with a concentration of 4 mol / L, and stirred thoroughly to obtain a transparent and clear solution B;

[0063] 4. Mix the two solutions of A and B in a 100mL hydrothermal reactor, and react at 100°C for 1h, 4h, 8h, 12h and 16h respectively;

[0064] 5. Wash the cooled reaction product repeatedly with deionized water and absolute ethanol several times, and centr...

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Abstract

The invention belongs to the technical field of a material and particularly relates to a nanometer bismuth sulfide electrode material with specific morphologic structure, a preparation method thereof and application of nanometer bismuth sulfide electrode material in a lithium ion battery. The bismuth sulfide electrode material provided by the invention is under a spherical or similar spherical secondary particle state formed by clustering the first particles with bar-shaped structures, wherein a gap is arranged between the first particles; the bar lengths of the first particles are 300-500nm; the diameter is 40-80nm; the secondary particles have microcellular structures; the aperture is 1.8-2nm; the specific area is 20-21cm<3> / g. The bismuth sulfide electrode material provided by the invention has relatively small specific area, small impedance and certain rate discharge characteristic. When the bismuth sulfide electrode material is applied to the lithium ion battery, the specific capacity of the lithium ion battery is increased.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a nano-bismuth sulfide electrode material with a specific shape structure, a preparation method thereof, and an application in lithium-ion batteries. Background technique [0002] Bi 2 S 3 Due to its high specific capacity, abundant natural reserves and low cost, it has shown great potential in new lithium-ion battery electrode materials. Bi 2 S 3 The theoretical specific capacity is as high as 625mAhg -1 , can be applied to a new generation of high-capacity and high-rate lithium-ion batteries; at the same time, bismuth sulfide is a non-toxic and environmentally friendly compound material. Lithium-ion batteries using bismuth sulfide materials as positive electrodes have the advantages of good safety, long cycle life, and environmental friendliness. [0003] Bi 2 S 3 The synthesis methods are not the same, and the morphology of the products obtained is also d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5815H01M4/62H01M4/623H01M4/625H01M10/0525Y02E60/10
Inventor 龙剑平刘云菡舒朝著邱泽亮李双杰
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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