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Carbon-composited sulfur compound composite material and preparation method and application thereof

A technology of chalcogenides and composite materials, which is applied in the fields of nanotechnology, electrochemical generators, electrical components, etc. for materials and surface science, which can solve the problem of low chalcogenide loading, difficult industrial application, and carbon-based composite materials. Structural stability can not meet the requirements and other problems

Inactive Publication Date: 2019-10-15
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the researchers have done a lot of research, the structural stability of the carbon-based composite material still cannot meet the requirements, and the proportion of the coated carbon material is too high, which will lead to a low loading of chalcogenides, making the mass ratio of the battery Low capacity, difficult for industrial application

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  • Carbon-composited sulfur compound composite material and preparation method and application thereof
  • Carbon-composited sulfur compound composite material and preparation method and application thereof
  • Carbon-composited sulfur compound composite material and preparation method and application thereof

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preparation example Construction

[0036] The present invention also provides a method for preparing a carbon-composite chalcogenide composite material described in the above technical solution, comprising the following steps:

[0037] After mixing metal powder and / or silicon powder with chalcogenide material and carbon material, mechanical alloying is carried out to obtain a carbon-composite chalcogenide compound material; the chalcogenide material is at least one of sulfur powder and selenium powder.

[0038] In the present invention, the metal powder and / or silicon powder refers to: a mixture of metal powder and silicon powder, metal powder, and silicon powder; specifically, when the chalcogenide is a metal chalcogenide, the Metal powder is mixed with chalcogenide materials and carbon materials, when the chalcogenides are silicon chalcogenides (such as SiS 2 、SiSe 2 ), the silicon powder is mixed with the chalcogenide material and the carbon material, and when the chalcogenide compound is a mixture of metal...

Embodiment 1

[0050] Put 0.933g iron powder (purity>99.95%), 1.067g sulfur powder (purity>99.9%), 0.1g multi-walled carbon nanotubes (purity>95%, diameter less than 8nm, length 10-30μm) in the glove box After the argon atmosphere is manually ground and mixed evenly, it is put into a stainless steel ball mill jar, and a stainless steel ball with a diameter of 12mm is weighed according to the ratio of the ball to material ratio of 10:1, and added to the stainless steel ball mill jar, and the The ball milling tank is sealed, and ball milling is carried out at a speed of 500r / min for 35 hours to obtain a carbon-composite iron disulfide negative electrode material, which is denoted as FeS 2 @CNTs.

[0051] Characterization of the structure:

[0052] FeS 2 @CNTs conducts X-ray diffraction (XRD) test, the test uses Rigaku D / max-2500 / PC (Cu Kα, 40kV, 200mA), the test range is 10°~80°, the rate is 4 degrees / min, the results are as follows figure 1 shown. Depend on figure 1 It can be seen that F...

Embodiment 2

[0060] 0.933g iron powder (purity > 99.95%), 1.067g sulfur powder (purity > 99.9%), and 0.1g graphene were manually ground and mixed in the argon atmosphere in the glove box, and then put into a stainless steel ball mill tank, according to Weigh stainless steel balls with a diameter of 12mm at a ball-to-material ratio of 10:1, add them to a stainless steel ball mill jar, seal the ball mill jar in an argon atmosphere, and ball mill for 40 hours at a speed of 500r / min to obtain carbon-composite disulfide Iron anode material, denoted as FeS 2 @graphene.

[0061] Test the FeS obtained in this embodiment 2 The SEM image of @graphene, and measure its average particle size to be 50nm; use HRTEM to test the FeS obtained in this example 2 @graphene's TEM image, and measured FeS 2 The average particle size of the nanocrystals is 10 nm.

[0062] Adopt the testing method of electrochemical performance among the embodiment 1 to test FeS 2Electrochemical performance of @graphene with a...

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Abstract

The invention provides a carbon-composited sulfur compound composite material and a preparation method and an application thereof, belonging to the technical field of secondary ion batteries. The carbon-composited sulfur compound composite material provided by the invention includes sulfur compound nanocrystals and disordered graphite carbon. The sulfur compound nanocrystals are located in the networked frame structure of the disordered graphite carbon. The sulfur compound nanocrystals are made of at least one of metal sulfur compound, silicon disulfide and silicon selenide. The carbon-composited sulfur compound composite material provided by the invention can still maintain high mass specific capacity and coulomb efficiency of above 99% after more than 100 times of cyclic charging and discharging, and has excellent cycle stability and rate performance.

Description

technical field [0001] The invention relates to the technical field of secondary ion batteries, in particular to a carbon-composite chalcogen compound composite material and its preparation method and application. Background technique [0002] In recent years, secondary lithium-ion batteries have been widely used in electronic products. However, with the development of science and technology, the capacity requirements for secondary lithium-ion batteries are getting higher and higher, and the capacity of negative electrode graphite used in existing commercial batteries can no longer meet the demand. Therefore, the development of anode materials with high capacity and fast ion transport is an urgent problem to be solved in the development of secondary lithium ion batteries. Chalcogenides are considered to be one of the most promising anode materials due to their abundant raw material resources, low price, and high theoretical capacity. However, chalcogenides have poor intrin...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/581H01M4/5815H01M4/62H01M4/628H01M10/0525H01M10/054Y02E60/10
Inventor 张隆刘艳艳
Owner YANSHAN UNIV
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