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Preparation method of graphene/sulfur/conductive polymer composite material for lithium-sulfur battery cathode

A conductive polymer and composite material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low utilization rate of elemental sulfur and poor capacity performance, and achieve less production equipment, shortened diffusion path, and convenient operation Effect

Active Publication Date: 2017-02-08
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, graphene is a porous material with many macropores, and elemental sulfur is preferentially distributed in macropores, which reduces the utilization rate of elemental sulfur.
The capacity is not good

Method used

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  • Preparation method of graphene/sulfur/conductive polymer composite material for lithium-sulfur battery cathode
  • Preparation method of graphene/sulfur/conductive polymer composite material for lithium-sulfur battery cathode

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preparation example Construction

[0023] Please refer to figure 1 Shown, the present invention discloses a kind of preparation method of the graphene / sulfur / conductive polymer composite material that is used for lithium-sulfur battery positive electrode, comprises the following steps:

[0024] (1) Mechanical mixing

[0025] Add elemental sulfur and graphene into a high-speed mixer according to the mass ratio, and disperse at a speed of 500-5000 r / min for 1-4 hours, and evenly disperse elemental sulfur in graphene sheets; the elemental sulfur is 99% Purity, the particle size of elemental sulfur is 1-5 μm, and the graphene is single-layer or multi-layer graphene, which is obtained by redox method, mechanical exfoliation method, epitaxial growth method or chemical vapor deposition.

[0026] (2) Isostatic fusion

[0027] Fill the compressed powder of the mixture of elemental sulfur and graphene into the rubber mold of the isostatic pressing molding machine. Through high-frequency electromagnetic vibration, the c...

Embodiment 1

[0032] (1) Mechanical mixing

[0033] Add elemental sulfur and graphene into a high-speed mixer according to the mass ratio, and disperse for 4 hours using a rotating speed of 500r / min, and evenly disperse elemental sulfur in graphene sheets; in this embodiment, the elemental sulfur is 99% The purity of elemental sulfur is 1 μm, and the graphene is single-layer graphene, which is obtained by redox method.

[0034] (2) Isostatic fusion

[0035] Fill the compressed powder of the mixture of elemental sulfur and graphene into the rubber mold of the isostatic pressing molding machine. Through high-frequency electromagnetic vibration, the compressed powder is compacted. After sealing, vacuumize the air between the powder particles and put it into a In a high-pressure container of water or oil, pressurize to 100 MPa, heat to 180°C, keep the pressure for 10 hours, cool to room temperature and press into a block;

[0036] (3) polymer coating

[0037] After crushing the block with a ...

Embodiment 2

[0039] (1) Mechanical mixing

[0040] Add elemental sulfur and graphene into a high-speed mixer according to the mass ratio, and disperse for 3 hours at a speed of 1000 r / min, and evenly disperse elemental sulfur in graphene sheets; in this embodiment, the elemental sulfur is 99 % purity, the particle size of elemental sulfur is 2 μm, and the graphene is multilayer graphene, which is obtained by mechanical exfoliation.

[0041] (2) Isostatic fusion

[0042]Fill the compressed powder of the mixture of elemental sulfur and graphene into the rubber mold of the isostatic pressing molding machine. Through high-frequency electromagnetic vibration, the compressed powder is compacted. After sealing, vacuumize the air between the powder particles and put it into a In a high-pressure container of water or oil, pressurize to 120 MPa, heat to 160°C, keep the pressure for 12 hours, cool to room temperature and press into a block;

[0043] (3) polymer coating

[0044] After crushing the ...

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Abstract

The invention discloses a method for preparing a graphene / sulfur / conductive polymer composite material used for the lithium-sulfur battery positive electrode. The method comprises the following steps: (1) mechanical mixing; (2) isostatic fusion; and (3) polymer cladding. According to the method, elemental sulfur is wrapped in a three-dimensional conductive network composed of graphene by using mechanical mixing, isostatic fusion, polymer cladding and other simple and practical means, so the excellent electrical contact between the elemental sulfur and the graphene can be kept, and the diffusion path of lithium ions is shortened, thereby ensuring that the electron conduction of an electrode material can not be lost. In addition, the elemental sulfur is cladded completely and uniformly by the conductive polymer, so that the direct contact between the polysulfide ion and the electrolyte in reactions is prevented effectively, and thus the initial charging / discharging efficiency and cyclic performance of the material are enhanced.

Description

technical field [0001] The invention relates to the technology in the field of preparation of lithium-sulfur battery electrode materials, in particular to a preparation method of a graphene / sulfur / conductive polymer composite material used for the positive electrode of lithium-sulfur battery. Background technique [0002] Lithium-ion batteries are widely used in various mobile electronic devices such as notebook computers, cameras, mobile phones, and tablet computers. Due to the rapid development of mobile electronic devices, the requirements for specific capacity and specific energy of batteries are getting higher and higher. At present, commercial lithium-ion batteries cannot satisfy the limitations of their own theoretical capacity, so there is an urgent need to develop secondary batteries with high specific capacity and high specific energy. Lithium-sulfur batteries (theoretical specific capacity is 1675.0 mAh / g, specific energy is 2500 Wh / kg, 2800 Wh / L) is considered ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1393H01M4/139H01M4/1399
CPCH01M4/139H01M4/1393H01M4/1399Y02E60/10
Inventor 李梅宋宏芳赵东辉戴涛周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD