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A preparation method of biochar airgel modified lithium-sulfur battery diaphragm

A biochar and lithium-sulfur battery technology, applied in the field of lithium-ion batteries, can solve the problems of limited polysulfide adsorption, high cost, and limited porosity of the barrier layer, etc., achieve electrochemical performance and cycle performance advantages, and improve performance , the effect of reducing production costs

Active Publication Date: 2020-10-09
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the barrier layer formed by these materials has limited porosity, which greatly limits the adsorption of polysulfides, and the cost of the material itself is high. Therefore, it is necessary to research and develop a material with strong adsorption capacity and low cost as the barrier layer of the separator.

Method used

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  • A preparation method of biochar airgel modified lithium-sulfur battery diaphragm
  • A preparation method of biochar airgel modified lithium-sulfur battery diaphragm
  • A preparation method of biochar airgel modified lithium-sulfur battery diaphragm

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Embodiment 1

[0038] A dual-element-doped biomass carbon airgel modified lithium-sulfur battery special diaphragm of the present invention, comprising a commercial diaphragm Celgard2400 body and a modified coating coated on the surface of the diaphragm body near the positive electrode, the modified coating The layer has a porous structure, and the mass ratio of dual-element doped pomelo peel-based biochar aerogel, conductive agent Super-P and binder polyvinylidene fluoride (PVDF) in the modified coating is about 6:1:3 , the doped dual elements are nitrogen and boron, and the thickness of the modified coating is about 15 μm.

[0039] The preparation method of the double-element-doped pomelo peel-based biomass carbon airgel modified lithium-sulfur battery special diaphragm includes the following steps:

[0040] (1) Preparation of dual-element doped pomelo peel-based biochar airgel material: remove the hard skin of pomelo peel, cut into pieces, wash clean, put it in a hydrothermal reaction ket...

Embodiment 2

[0046] A pure pomelo peel-based biomass carbon airgel modified lithium-sulfur battery special diaphragm of the present invention, comprising a commercial diaphragm Celgard2400 body and a modified coating coated on the surface of the diaphragm body near the positive electrode, the modified coating The layer has a porous structure. The mass ratio of pomelo peel-based biochar aerogel, conductive agent Super-P and binder polyvinylidene fluoride (PVDF) in the modified coating is about 6:1:3. The thickness of the layer is about 15 μm.

[0047] The preparation method of the pure pomelo peel-based biomass carbon airgel modified lithium-sulfur battery special diaphragm comprises the following steps:

[0048] (1) Preparation of pure pomelo peel-based biochar airgel material: remove the hard skin of pomelo peel, cut into pieces, wash clean, put it in a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 180°C in a blast drying oven for 10 hours. Soak in a hot water bath...

Embodiment 3

[0057] A pure pomelo peel-based biomass carbon airgel modified lithium-sulfur battery special diaphragm of the present invention, comprising a commercial diaphragm Celgard2400 body and a modified coating coated on the surface of the diaphragm body near the positive electrode, the modified coating The layer has a porous structure. The mass ratio of pomelo peel-based biochar aerogel, conductive agent Super-P and binder polyvinylidene fluoride (PVDF) in the modified coating is about 7:1:2. The thickness of the layer is about 15 μm.

[0058] The preparation method of the pure pomelo peel-based biomass carbon airgel modified lithium-sulfur battery special diaphragm comprises the following steps:

[0059] (1) Preparation of pure pomelo peel-based biochar airgel material: remove the hard skin of pomelo peel, cut into pieces, wash clean, put it in a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 180°C in a blast drying oven for 10 hours. Soak in a hot water bath...

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Abstract

The invention discloses a special diaphragm for a biomass carbon aerogel modified lithium-sulfur battery. The special diaphragm comprises a diaphragm body and a modified coating coated on the side surface, close to a positive electrode, of the diaphragm body; the modified coating comprises a pomelo based biomass carbon aerogel, a conductive agent and a binding agent; and the modified coating is ofa porous structure. Lithium ion can pass through a porous blocking layer of the pomelo based biomass carbon aerogel of the modified coating of the special diaphragm and the conductive agent, the porous blocking layer also can achieve certain blocking and adsorption effects for polysulfides generated in the redox reaction of the positive electrode, and the special diaphragm has advantages for theelectrochemical performance and cycle performance of the battery. The invention also discloses a preparation method of the special diaphragm for the biomass carbon aerogel modified lithium-sulfur battery. The method is relatively simple, a novel diaphragm does not need to be developed, and a modified material needs to be coated on an existing commercial normal diaphragm, so that the time and costare greatly saved. The invention also discloses the lithium-sulfur battery assembled by using the special diaphragm.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a special diaphragm for lithium-sulfur batteries modified by biomass carbon airgel, a preparation method thereof, and lithium-sulfur batteries. Background technique [0002] The lithium-sulfur battery is a secondary battery with sulfur as the positive electrode material and lithium metal sheet as the negative electrode material. Its theoretical specific capacity and battery theoretical specific energy are 1675mAh / g and 2600Whk / g, respectively. Moreover, sulfur element has a high content in the earth's crust, is an environmentally friendly element, and has low cost. It has good application prospects in fields such as electric vehicles and consumer electronics. However, there are certain problems in the application process of lithium-sulfur batteries. The main problem is that the intermediate discharge products of lithium-sulfur batteries will dissolve in the organi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/403H01M50/431H01M50/449Y02E60/10
Inventor 朱琳尤良军沈湘黔杨乐之
Owner CHANGSHA RES INST OF MINING & METALLURGY