Preparation method for nitrogen-doped graphene-coated nickel sulfide composite electrode material

A technology of nitrogen-doped graphene and composite electrodes, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of difficult control and batch preparation, harsh reaction conditions, uneven distribution, etc., and achieve low cost and convenient mass production , the reaction conditions and the simple effect of the device

Active Publication Date: 2016-08-24
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to overcome existing nickel sulfide (Ni 3 S 2 )/graphene (particularly nano-nickel sulfide/graphene) composite lithium ion electrode material preparation method deficiencies: the presence of nickel sulfide/graphene composite material has weak interaction between each other, uneven distribu

Method used

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  • Preparation method for nitrogen-doped graphene-coated nickel sulfide composite electrode material
  • Preparation method for nitrogen-doped graphene-coated nickel sulfide composite electrode material
  • Preparation method for nitrogen-doped graphene-coated nickel sulfide composite electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Soak 200g of nitrogen- and sulfur-containing thiourea resin in 1.1L of sulfuric acid solution with a concentration of 0.5mol / L and stir for 6h, then filter it, wash it with deionized water until the pH is neutral, and then dry it at 80°C for 24h. After drying, pulverize with a pulverizer for use;

[0028] (2) Gained thiourea resin 3.0g after pulverizing in the step (1) is spread on the porcelain boat, then covers the foamed nickel on the porcelain boat;

[0029] (3) Transfer the porcelain boat covered with nickel foam obtained in step (2) into a high-temperature furnace, and heat it to 800° C. at a heating rate of 3° C. / min under nitrogen protection and keep it warm for 0.5 hours. Simultaneously, the sulfur containing nitrogen and sulfur Thermal decomposition of urea resin provides gaseous carbon source, nitrogen source and sulfur source to react on the surface of nickel foam, and the substance produced by the reaction is on the surface of nickel foam. After the rea...

Embodiment 2

[0031] (1) Soak 200g of nitrogen- and sulfur-containing mercaptoamine type chelating resin with 0.8L concentration of 1.0mol / L hydrochloric acid solution and stir for 8h, filter it, and wash it with deionized water until the pH is neutral, then 80°C Dry for 24 hours, after drying, pulverize with a pulverizer for use;

[0032] (2) get the gained mercaptoamine type chelating resin 4.0g after being pulverized in the step (1) and lay flat on the corundum boat, then cover the nickel sheet on the corundum boat;

[0033] (3) Transfer the corundum boat covered with nickel sheets obtained in step (2) into a high-temperature furnace, and heat it to 850° C. at a heating rate of 5° C. / min under argon protection and keep it warm for 0.75 hours. Simultaneously, nitrogen and sulfur-containing The thermal decomposition of mercaptoamine-type chelating resin provides gaseous carbon source, nitrogen source and sulfur source to react on the surface of the nickel sheet. The substances produced by ...

Embodiment 3

[0035] (1) 200g of nitrogen-containing and sulfur-containing isothiourea chelating resins with 2.0L concentration is that the sulfuric acid solution nitric acid solution of 2.0mol / L soaks and stirs after 6h and filters, and it is neutral to be cleaned to pH with deionized water, then Dry at 80°C for 24 hours, and then pulverize with a pulverizer for later use;

[0036] (2) get the gained isothiourea chelating resin 1.5g after pulverizing in the step (1) and lay flat on the quartz boat, then cover nickel foil on the quartz boat;

[0037] (3) Transfer the quartz boat covered with nickel foil obtained in step (2) into a high-temperature furnace, and heat it to 900° C. at a heating rate of 8° C. / min under nitrogen protection and keep it warm for 1.5 hours. The thermal decomposition of thiourea chelating resin provides gaseous carbon source, nitrogen source and sulfur source to react on the surface of nickel foil, and the substances produced by the reaction are on the surface of ni...

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Abstract

The invention discloses a preparation method for a nitrogen-doped graphene-coated nickel sulfide composite electrode material. The preparation method comprises the steps of (1) immersing resin containing nitrogen and sulfur into an acid solution to be stirred, cleaned, dried and smashed; (2) paving the mixture on a material boat, and covering with a nickel-based material; and (3) moving the mixture into a high-temperature furnace, carrying out heating treatment under an inert gas protection condition, and then cooling after the reaction is completed to obtain the composite electrode material. According to the preparation method, a gaseous carbon source, a sulfur source and a nitrogen source are generated from the resin containing both nitrogen and sulfur through thermal decomposition; then nickel sulfide nanoparticles and a graphene composite material are grown on the foamed nickel directly and synchronously; the nitrogen-doped graphene which is grown on the surfaces of the nickel sulfide nanoparticles is catalyzed by the nickel sulfide nanoparticles, so that the interaction between the graphene and the nickel sulfide nanoparticles is reinforced, the agglomeration of the nickel sulfide nanoparticles is effectively restrained and the volume expansion of the nickel sulfide nanoparticles in the cycling process is relieved; meanwhile, the nitrogen-doped graphene can promote ion and electron transport; and in addition, the composite electrode material is less in steps, simple in reaction conditions and apparatus, low in cost, and convenient to realize mass production in practical applications.

Description

technical field [0001] The invention relates to a preparation method of a composite lithium ion electrode material, in particular to a preparation method of a nitrogen-doped graphene-coated nickel sulfide composite electrode material. Background technique [0002] With the increasingly serious environmental pollution and global warming, as an important power source for electric devices and electric vehicles, lithium-ion batteries have always been a research hotspot in academia and industry [Chem.Rev.2004, 104, 4271]. Due to the excellent electrochemical performance and low cost of nickel sulfide, nickel sulfide is considered as a potentially feasible anode material for lithium-ion batteries [J.Mater.Chem.2009,19,7277]. Nickel disulfide (Ni 3 S 2 ) is one of the most important phases in nickel sulfide, which has abundant stock, low price, and high theoretical capacity, and has great application prospects in the fields of lithium-ion batteries and supercapacitors. However, ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M4/1397H01M10/0525
CPCH01M4/136H01M4/1397H01M4/362H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 朱金良沈培康黄士志张伶俐王静妍
Owner GUANGXI UNIV
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