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Sulfur-series anode material, preparation method thereof and battery

A cathode material, sulfur system technology, applied in the field of materials

Active Publication Date: 2016-02-03
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method can only slow down rather than avoid the dissolution process of polysulfides, and cannot fundamentally solve the problem

Method used

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  • Sulfur-series anode material, preparation method thereof and battery
  • Sulfur-series anode material, preparation method thereof and battery
  • Sulfur-series anode material, preparation method thereof and battery

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preparation example Construction

[0045] The present invention also provides a method for preparing the above-mentioned chalcogenide cathode material, comprising:

[0046] Mix sulfur powder with M and carbon substrate, and carry out co-melting reaction under sealed conditions to obtain sulfur-based positive electrode materials;

[0047] The M is any one or more of selenium powder, antimony powder, iodine, red phosphorus, bismuth, tin;

[0048] The added amount of the carbon substrate is 0% to 80% of the total mass of raw materials, more preferably 0% to 70% of the total mass of raw materials. In some specific embodiments of the present invention, the added amount of the carbon substrate is 40% to 70% of the total mass of raw materials.

[0049] Wherein, the molar ratio of the sulfur powder to M is preferably (70:30)-(99.6:0.4), more preferably (9-99):1.

[0050] In the present invention, the carbon substrate is preferably any one or more of graphene, porous carbon material, carbon nanotube and CMK-3.

[005...

Embodiment 1

[0059] Embodiment 1 takes porous carbon material as substrate, prepares S 1-x Se x / C(x=0.1) material.

[0060] Take 5 grams of sulfur powder, 1.2 grams of selenium powder and 4 grams of porous carbon, mix them by wet ball milling for 24 hours, seal them in a 10mL reaction kettle, place them under a resistance crucible furnace, react at 220°C for 10 hours, and then cool naturally to Room temperature; S can be obtained after boiling the kettle 1-x Se x / C(x=0.1) material.

[0061] The S prepared by X-ray powder diffractometer 1-x Se x / C (x=0.1) material is subjected to X-ray diffraction analysis, figure 1 The S prepared for Example 1 of the present invention 1-x Se x / C (x=0.1) X-ray diffraction spectra of materials at different temperatures. Depend on figure 1 It can be seen that in the X-ray diffraction spectrum, there are only clearly visible amorphous diffraction peaks in the range of 2θ in the range of 10° to 80°, which proves that the material has an amorphous ...

Embodiment 2

[0065] Take 5 grams of sulfur powder and 1.2 grams of selenium powder, mix them by wet ball milling for 24 hours, seal them in a 10mL reaction kettle, place them under a resistance crucible furnace, react at 200°C for 10 hours, and then cool naturally to room temperature; to get S 1-x Se x (x=0.1) Material.

[0066] The S prepared by X-ray powder diffractometer 1-x Se x (x=0.1) The material is subjected to X-ray diffraction analysis, and the results are shown in Figure 4 , Figure 4 The S prepared for Example 2 of the present invention 1-x Se x (x=0.1) X-ray diffraction spectra of materials at different temperatures. Depend on Figure 4 It can be seen that after the temperature is greater than 110 °C, the XRD of the product corresponds to a structure similar to monoclinic sulfur.

[0067] Adopt scanning electron microscope and transmission electron microscope to detect material structure, the result shows, the S prepared by the present invention 1-x Se x (x=0.1) Th...

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Abstract

The invention provides a sulfur-series anode material. The chemical formula is as indicated by formula (I) S<1-x>M<x> or formula (II) S<1-x>M<x> / C, wherein x is greater than 0 and less than 1; M is one or more of Se, Te, I, P, Bi and Sn. Compared with an existing sulfur anode material, the sulfur-series anode material can be used for effectively solving the problem that in the circulation process, an intermediate product of the sulfur anode material is dissolved, and excellent electrochemical performance is obtained. Meanwhile, the material can be applied to electrolyte of a conventional lithium ion battery, and the compatibility problem of a complete battery assembled with the material and other high-performance lithium ion battery electrode materials is further solved.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a chalcogenide cathode material, a preparation method thereof and a battery. Background technique [0002] Lithium-ion battery is a secondary rechargeable battery that mainly relies on lithium ions to move between positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Due to its high volume specific energy and mass specific energy, rechargeable and non-polluting, it has been widely used in modern digital products such as mobile phones and notebook computers. [0003] However, due to the limitations of the specific capacity and energy density of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/052
CPCH01M4/362H01M10/052H01M2004/021Y02E60/10
Inventor 钱逸泰朱永春李晓娜
Owner UNIV OF SCI & TECH OF CHINA
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