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Hierarchical structure coating diaphragm for lithium-sulfur battery and preparation method thereof

A base film and binder technology, used in lithium batteries, secondary batteries, structural parts, etc., can solve the problems of increasing the material preparation process and application cost, low electrical conductivity, limited effect, etc., and achieve a green environmental protection scale The effect of large-scale production, improved interface wettability, and ease of large-scale production

Active Publication Date: 2021-01-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used are carbon material modified diaphragm, polymer modified diaphragm, metal organic framework compound modified diaphragm, among which carbon material has good electrical conductivity and can be used as the upper current collector, but its polarity is poor, and it is difficult to combine with polysulfide A strong interaction occurs; the polymer has good mechanical stability and can buffer the volume change of sulfur during charge and discharge, but its conductivity is not high and it is difficult to contribute to the electronic pathway; metal organic framework compounds have narrow pores and can act as ions The sieve suppresses the shuttle effect of polysulfides, but its electronic conductivity is very poor, which needs to be improved by mixing carbon materials
[0004] There are many reports on the modified diaphragm by mixing two compounds, which can take advantage of the advantages of each material and avoid the disadvantages of each material, but this method will inevitably increase the preparation process and application cost of the material, and the physical mixing of multiple materials cannot be completely uniform , the effect is limited, so the method of directly preparing the mixture of two compounds in one step is more effective

Method used

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  • Hierarchical structure coating diaphragm for lithium-sulfur battery and preparation method thereof
  • Hierarchical structure coating diaphragm for lithium-sulfur battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) 1.354g of manganese acetate and 0.952g of benzoic acid were dissolved in 40mL of diethylformamide as reaction substances, stirred for 10h until completely dissolved, and then 1.295g of terephthalic acid was added and fully stirred and dissolved;

[0053] (2) In a closed environment, the hydrothermal reaction is carried out at 200 ° C for 6 hours, and then naturally cooled to room temperature to obtain the reaction product;

[0054] (3) The reaction product was filtered to obtain a white solid, washed with distilled water and ethanol until the pH was neutral, and vacuum-dried and dehydrated at 60° C. for 24 hours to obtain a manganese-based coordination polymer;

[0055] (4) heating the manganese-based coordination polymer to 600°C at a heating rate of 3°C / min in an argon atmosphere, holding it for 2 hours and then cooling to obtain a MnO / C precursor;

[0056] (5) The MnO / C precursor was heated to 1000°C at a heating rate of 3°C / min in a nitrogen atmosphere with a pu...

Embodiment 2

[0061] (1) 1.354g of manganese acetate and 1.904g of benzoic acid were dissolved in 40mL of diethylformamide as reaction substances, stirred for 24h until completely dissolved, and then 2.59g of terephthalic acid was added and fully stirred and dissolved;

[0062] (2) In a closed environment, the hydrothermal reaction is carried out at 200 ° C for 12 h, and then naturally cooled to room temperature to obtain the reaction product;

[0063] (3) The reaction product was filtered to obtain a white solid, washed with distilled water and ethanol until the pH was neutral, and vacuum-dried and dehydrated at 70° C. for 24 h to obtain a manganese-based coordination polymer;

[0064] (4) heating the manganese-based coordination polymer to 600°C at a heating rate of 5°C / min in an argon atmosphere, keeping it for 2 hours and then cooling to obtain a MnO / C precursor;

[0065] (5) The MnO / C precursor was heated to 1000°C at a heating rate of 5°C / min in a nitrogen atmosphere with a purity of ...

Embodiment 3

[0070] (1) 1.354g of manganese acetate and 1.904g of benzoic acid were dissolved in 60mL of dimethylformamide as reaction substances, stirred for 30h until completely dissolved, and then 3.885g of terephthalic acid was added and fully stirred and dissolved;

[0071] (2) In a closed environment, the hydrothermal reaction is carried out at 180 ° C for 10 h, and then naturally cooled to room temperature to obtain the reaction product;

[0072] (3) filter the reaction product to obtain a white solid, wash with distilled water and ethanol until the pH is neutral, and vacuum dry and dehydrate at 100° C. for 20 hours to obtain a manganese-based coordination polymer;

[0073] (4) heating the manganese-based coordination polymer to 550°C at a heating rate of 5°C / min in an argon atmosphere, holding it for 3 hours and then cooling to obtain a MnO / C precursor;

[0074] (5) The MnO / C precursor was heated to 1100°C at a heating rate of 5°C / min in a nitrogen atmosphere with a purity of 99.9%...

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Abstract

The invention discloses a hierarchical structure coating diaphragm for a lithium-sulfur battery and a preparation method thereof, and belongs to the technical field of battery materials. The hierarchical structure coating diaphragm for a lithium-sulfur battery, provided by the invention, comprises a MnO / N-C material and a base membrane, the MnO / N-C material has a unique hierarchical structure, andMnO particles are covered by a uniform thin carbon layer and embedded into a nitrogen-doped carbon microcrystalline sheet. The MnO / N-C material has a relatively high specific surface area, and is beneficial to storage of a liquid electrolyte, so that the interface wettability of a diaphragm / electrolyte is improved, and lithium ions can be quickly diffused to an electrode along each direction; diffusion of dissolved polysulfide can be physically blocked, and the polysulfide can be used as an upper-layer current collector to improve the utilization rate of active substances, so that the electrochemical performance of the lithium-sulfur battery is improved; the preparation method of the MnO / N-C material is simple to operate, environment-friendly and easy for large-scale production.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a graded structure coating separator for lithium-sulfur batteries and a preparation method thereof. Background technique [0002] With the rapid development of mobile electronic devices and electric vehicles, lithium secondary batteries with higher energy density are urgently needed for energy storage. However, lithium-ion batteries are still widely used in the market, but the theoretical capacity of the positive electrode is not high, and it is difficult to match to obtain high-energy-density batteries to meet the needs of application development. The lithium-sulfur battery cathode uses elemental sulfur as the active material, the theoretical specific capacity of sulfur is 1672mAh / g, and the theoretical energy density of the lithium-sulfur battery matched with the lithium metal anode is 2600Wh / kg, which is widely regarded as the next-generation energy storage system. ...

Claims

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Application Information

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IPC IPC(8): C01G45/02C01B21/082H01M50/431H01M50/449H01M50/451H01M10/052H01M10/42
CPCC01B21/0605C01G45/02C01P2004/04H01M10/052H01M10/4235Y02E60/10
Inventor 陈人杰徐赛男赵腾王丽莉叶玉胜吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY