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Sea-urchin-shaped bismuth sulfide/macropore graphene composite material, preparation method and application thereof

A composite material and graphene technology, applied in the direction of electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of large volume effect, restricting the application of lithium-ion battery anode materials, poor cycle stability, etc., and achieve simple equipment requirements, Low preparation cost and the effect of relieving volume expansion pressure

Active Publication Date: 2017-08-08
YANGZHOU UNIV
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  • Application Information

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Problems solved by technology

But Bi 2 S 3 It has a large volume effect in the process of intercalating and removing lithium, which leads to poor cycle stability in the process of charging and discharging, which restricts its application as a negative electrode material for lithium-ion batteries.
Although in recent years, by preparing Bi with different morphologies 2 S 3 , its cycle stability has improved, but it has not been fundamentally resolved

Method used

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  • Sea-urchin-shaped bismuth sulfide/macropore graphene composite material, preparation method and application thereof
  • Sea-urchin-shaped bismuth sulfide/macropore graphene composite material, preparation method and application thereof
  • Sea-urchin-shaped bismuth sulfide/macropore graphene composite material, preparation method and application thereof

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Experimental program
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Embodiment 1

[0029] 1. Prepare 0.2 mol / L bismuth nitrate aqueous solution:

[0030] Weigh 9.7020 g Bi(NO 3 ) 3 ·5H 2 O was placed in a small beaker, dissolved in deionized water, drained into a 100 mL volumetric flask with a glass rod, and then made to volume with deionized water to obtain a 0.2 mol / L bismuth nitrate aqueous solution.

[0031] 2. Preparation of macroporous graphene

[0032] Weigh 60 mg of graphene oxide and make up 3 mg mL -1 Graphene oxide suspension, after ultrasonic treatment (ultrasonic treatment time 2 h, power 55 kHz), the suspension was transferred to the reactor lining made of polytetrafluoroethylene, and the lining was put into the steel In the reaction kettle of the prepared material and tighten the upper cover of the reaction kettle, then place the reaction kettle in a constant temperature blast drying oven and set the temperature to 180 o C, reacted for 12 h, the macroporous graphene prepared under the conditions of concentration, temperature and time had ...

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Abstract

The invention discloses a sea-urchin-shaped bismuth sulfide / macropore graphene composite material, a preparation method and application thereof. A simple hydrothermal method is utilized, bismuth nitrate is utilized as a bismuth source, thiourea is utilized as a sulfur source, trimellitic acid is utilized as an adhesive, cetyl trimethyl ammonium bromide is utilized as a surface active agent, redistilled water is utilized as a solvent, and the sea-urchin-shaped bismuth sulfide / macropore graphene composite is prepared. The preparation method disclosed by the invention is simple to operate and has controllable reaction conditions; the prepared bismuth sulfide has uniform morphology and is successfully loaded in macropore graphene holes; the macropore graphene can effectively buffer volume expansion pressure of the bismuth sulfide in a charging and discharging process, better shortens lithium ion and electron diffusion paths in a circular charging and discharging process and greatly improves circulation performance of batteries.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and in particular relates to a sea urchin-like bismuth sulfide / macroporous graphene composite material, a preparation method and an application thereof. Background technique [0002] At present, the anode materials of lithium-ion batteries that have been commercialized are mainly carbon-based materials, but the low specific capacity and safety issues of carbon-based materials have become technical bottlenecks restricting their further development. [0003] Bismuth sulfide (Bi 2 S 3 ) is an important semiconductor material, in terms of lithium storage, Bi 2 S 3 The theoretical specific capacity of nanomaterials reaches 625 mAh / g, and has fully reversible electrochemical reaction characteristics. On the other hand, Bi 2 S 3 The negative electrode material has the advantages of rich raw material resources, low cost, good safety performance, no pollution, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 杨占军王磊李娟
Owner YANGZHOU UNIV
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