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Preparation method of sulfur-containing electrode material

A technology of electrode material and porous carbon material, applied in the field of preparation of sulfur-containing electrode materials, can solve the problems of poor battery safety, loss of active material, puncture of separator, etc., and achieve the effect of strong adsorption capacity and good battery performance

Active Publication Date: 2016-02-03
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, elemental sulfur itself is not conductive, and must be combined with a conductive substance to make an electrode, and the introduction of a conductive agent as a conductive component will lead to a significant reduction in the content of sulfur in the positive electrode coating, thereby reducing lithium. The energy density of sulfur batteries; at the same time, during the charging and discharging process of lithium-sulfur batteries, elemental sulfur will be converted into polysulfides, and polysulfides will dissolve in the liquid organic electrolyte, resulting in the loss of active materials during the cycle, which is more Seriously, the dissolved sulfide will precipitate on the negative electrode to form dendrites, which has a great risk of piercing the separator, resulting in extremely poor safety of the battery

Method used

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  • Preparation method of sulfur-containing electrode material

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Embodiment 1

[0025] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0026] Pretreatment of the porous substrate: select a porous carbon material with a particle size of 10 μm to 20 μm, a pore size of 10 nm to 50 nm, and a porosity of 80% as the substrate, and place it in an environment of 10 ° C and 1 kpa for 1 min to obtain the pretreated Porous carbon materials;

[0027] Filling of sulfur-containing components: maintain an air pressure of 1kpa, raise the temperature to 200°C, and fully mix the treated porous carbon material with elemental sulfur (mass ratio is 3:7), so that the molten sulfur can fully penetrate into the pores of the porous carbon material in the structure;

[0028] Preparation of sulfur-containing electrode materials: After the molten sulfur fully fills the pore structure of the porous material, 10MPa helium gas is introduced into the reactor, and then the pressure is maintained, the temperature of the reactant is ...

Embodiment 2

[0030] Embodiment 2, different from Embodiment 1, this embodiment includes the following steps:

[0031] Pretreatment of the porous substrate: select a porous carbon material with a particle size of 10 μm to 20 μm, a pore size of 10 nm to 50 nm, and a porosity of 80% as the substrate, and place it in an environment of 110 ° C and 1 kpa for 1 min to obtain the pretreated Porous carbon materials;

[0032] Filling of sulfur-containing components: maintain an air pressure of 1kpa, raise the temperature to 110°C, and fully mix with the treated porous carbon material and elemental sulfur (mass ratio is 3:7), so that the molten sulfur can fully penetrate into the pores of the porous carbon material in the structure;

[0033] Others are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0034] Embodiment 3, different from Embodiment 1, this embodiment includes the following steps:

[0035] Pretreatment of the porous substrate: choose a porous carbon material with a particle size of 10 μm to 20 μm, a pore size of 10 nm to 50 nm, and a porosity of 80% as the substrate, and place it in an environment of 450 ° C and 1 kpa for 1 min to obtain the pretreated Porous carbon materials;

[0036] Filling of sulfur-containing components: maintain an air pressure of 1kpa, raise the temperature to 450°C, and fully mix the treated porous carbon material with elemental sulfur (mass ratio is 3:7), so that the molten sulfur can fully penetrate into the pores of the porous carbon material in the structure;

[0037] Others are the same as in Example 1, and will not be repeated here.

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Abstract

The invention belongs to the field of lithium-sulfur batteries, and particularly relates to a preparation method of a sulfur-containing electrode material. The method includes the three main steps of preprocessing of a porous matrix, filling of sulfur-containing components and preparation of the sulfur-containing electrode material. At the porous matrix preprocessing stage, gas components in the hole structure of the porous matrix are sufficiently discharged through long-time and high-vacuum processing, and enough space is preserved for filling of sulfur-containing components. In the mixing process of the sulfur-containing components and the porous matrix and before filling of the sulfur-containing components, the high vacuum degree is kept all the time, reserved space in the hole structure of the porous matrix can be kept, and the porous structure can be filled with enough sulfur-containing components.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and in particular relates to a preparation method of a sulfur-containing electrode material. Background technique [0002] Since 1991, carbon materials were creatively used in the field of lithium-ion batteries and brought about revolutionary changes in this field, that is, after multiple charging and discharging efficiently and safely, they have been widely used in mobile phones, cameras, and notebooks. computers and other portable appliances. Compared with traditional lead-acid, Ni-Cd, MH-Ni batteries, lithium-ion batteries have higher specific volume energy density, specific gravimetric energy density, better environmental friendliness, smaller self-discharge and longer battery life. It is an ideal power supply for mobile appliances, power supplies for electric vehicles, and storage appliances for power stations in the 21st century. [0003] However, with the improvement of life taste...

Claims

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Application Information

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IPC IPC(8): H01M4/64H01M4/38H01M10/052
CPCH01M4/38H01M4/80H01M10/052Y02E60/10
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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