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Preparation method of anode material of lithium-sulphur battery

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, positive electrodes, etc., can solve the problems of material structure collapse, active material loss, and impact on battery cycle performance, achieve good electrical conductivity and mechanical strength, improve Cycle performance, effect of relieving internal stress

Inactive Publication Date: 2018-07-06
ZHEJIANG FOREVER NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at this stage, lithium-sulfur batteries are facing a series of problems: 1. Elemental sulfur and discharge products Li2S2 / Li2S are electronic and ionic insulators, which increase battery resistance and polarization; 2. There is volume expansion of positive electrode materials during discharge 3. The soluble polysulfides produced during the charge and discharge process migrate and react between the positive and negative electrodes due to diffusion, and the "shuttle effect" of polysulfides occurs, resulting in active material irreversible loss
[0004] In order to solve the problems faced by lithium-sulfur batteries, workers have conducted a lot of research on it. For example, Chinese patent application publication number CN106981649A has prepared a lithium-sulfur battery cathode material with a graphene hollow sphere-sulfur composite three-dimensional structure, which inhibits the lithium-sulfur battery to a certain extent. The "shuttle effect" of polysulfides and the volume expansion effect of positive electrode materials, but it does not greatly improve the battery cycle performance

Method used

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Embodiment 1

[0035] The preparation method of lithium-sulfur battery positive electrode material of the present invention, it specifically comprises the following steps:

[0036] S1. Dispersing the carbon material in a solvent to form a mixed suspension. Wherein, the carbon material is one or more of graphite, graphene, graphene oxide, reduced graphene oxide, soft carbon, hard carbon, porous carbon, carbon nanotube, carbon nanofiber and hollow carbon sphere; The solvent is one or more of deionized water, ethanol, ethylene glycol, n-propanol, isopropanol, propylene glycol, n-butanol and carbitol.

[0037] S2. Put the sulfur-containing substance into the mixed suspension and perform ultrasonication for 2 hours, adjust the mixed suspension to be neutral or weakly acidic with an acid solution, filter with suction, and wash to obtain a sulfur-carbon composite material. Wherein, the mass ratio of the carbon material to the sulfur element in the sulfur-containing substance is 1:0.5. The sulfur-...

Embodiment 2

[0040] The preparation method of lithium-sulfur battery positive electrode material of the present invention, it specifically comprises the following steps:

[0041] S1. Dispersing the carbon material in a solvent to form a mixed suspension. Wherein, the carbon material is one or more of graphite, graphene, graphene oxide, reduced graphene oxide, soft carbon, hard carbon, porous carbon, carbon nanotube, carbon nanofiber and hollow carbon sphere; The solvent is one or more of deionized water, ethanol, ethylene glycol, n-propanol, isopropanol, propylene glycol, n-butanol and carbitol.

[0042] S2. Put the sulfur-containing substance into the mixed suspension and perform ultrasonication for 24 hours, adjust the mixed suspension to be neutral or weakly acidic with an acid solution, filter with suction, and wash to obtain a sulfur-carbon composite material. Wherein, the mass ratio of the sulfur element in the carbon material to the sulfur-containing substance is 1:9. The sulfur-c...

Embodiment 3

[0045] The preparation method of lithium-sulfur battery positive electrode material of the present invention, it specifically comprises the following steps:

[0046] S1. Dispersing the carbon material in a solvent to form a mixed suspension. Wherein, the carbon material is one or more of graphite, graphene, graphene oxide, reduced graphene oxide, soft carbon, hard carbon, porous carbon, carbon nanotube, carbon nanofiber and hollow carbon sphere; The solvent is one or more of deionized water, ethanol, ethylene glycol, n-propanol, isopropanol, propylene glycol, n-butanol and carbitol.

[0047] S2. Put the sulfur-containing substance into the mixed suspension and perform ultrasonication for 12 hours, adjust the mixed suspension to be neutral or weakly acidic with an acid solution, filter with suction, and wash to obtain a sulfur-carbon composite material. Wherein, the mass ratio of the carbon material to the sulfur element in the sulfur-containing substance is 1:5. The sulfur-c...

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Abstract

The invention provides a preparation method of an anode material of a lithium-sulphur battery. The preparation method comprises the steps of preparing a sulfur-carbon composite, loading a conductive metal on the surface of the sulfur-carbon composite to form a composite composited by the conductive metal, a sulfur material and a carbon material. The method can inhibit a shuttle effect of polysulfide and a volume expansion effect of the anode material, and the cycle performance of the battery is effectively improved.

Description

technical field [0001] The invention relates to the field of battery preparation, in particular to a method for preparing a cathode material of a lithium-sulfur battery. Background technique [0002] Lithium-sulfur battery is a kind of lithium battery with sulfur element as the positive electrode of the battery. When discharging, the negative electrode reaction is that lithium loses electrons and becomes lithium ions, and the positive electrode reaction is that sulfur reacts with lithium ions and electrons to form sulfide. The potential difference between the positive and negative electrodes is The discharge voltage provided for lithium-sulfur batteries. Under the action of an applied voltage, the positive and negative reactions of the lithium-sulfur battery proceed in reverse, which is the charging process. The theoretical discharge mass specific capacity of sulfur is 1675mAh / g, and the theoretical discharge mass specific capacity of elemental lithium is 3860mAh / g. The th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/626H01M4/628H01M10/052H01M2004/028Y02E60/10
Inventor 张芳芳赵亚刘桐桐杨冬生翟博刘俊军
Owner ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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