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Functionalized diaphragm for lithium-sulfur battery and preparation method of functionalized diaphragm

A lithium-sulfur battery and functionalized technology, applied in the field of electrochemistry, can solve the problems of difficulty in inhibiting the diffusion of polysulfides, poor cycle stability of lithium-sulfur batteries, loss of active material sulfur, etc. Chemical properties, the effect of improving utilization

Inactive Publication Date: 2020-04-03
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the actual operation of lithium-sulfur batteries during charging and discharging, the diffusion of polysulfides through the separator inside the battery may lead to the loss of active materials and corrosion of the negative electrode.
Due to the high porosity and non-polar characteristics of traditional lithium-sulfur battery separators, it is difficult to inhibit the diffusion of polysulfides, resulting in the loss of active material sulfur. At the same time, polysulfides diffused to the negative electrode cause the instability of lithium negative electrodes. The shortcomings of lithium-sulfur batteries lead to a series of problems such as poor cycle stability and low actual specific capacity.

Method used

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  • Functionalized diaphragm for lithium-sulfur battery and preparation method of functionalized diaphragm
  • Functionalized diaphragm for lithium-sulfur battery and preparation method of functionalized diaphragm
  • Functionalized diaphragm for lithium-sulfur battery and preparation method of functionalized diaphragm

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Embodiment 1

[0030] A functionalized separator for lithium-sulfur batteries, comprising a base film, one side of the base film is provided with a conductive adsorption coating; the conductive adsorption coating includes a conductive powder carbon material and an adsorption inorganic polar material; The adsorbed inorganic polar material is obtained from the precursor after heat treatment.

[0031] The base film is Celgard commercial polypropylene (PP) membrane; the thickness of the base film is 25 μm. The conductive powder carbon material is Super P; the particle size of the adsorbed inorganic polar material is 0.15-3 μm.

[0032] The preparation method of the precursor includes the following steps: weighing 100 g of ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O) After stirring and dissolving in 250ml of deionized water, continue to add 25g of glucose, mechanically stirring to dissolve, and control the spray air inlet temperature to discharge at 160℃ to obtain FeSO through a spray dryer. 4 / Gluco...

Embodiment 2

[0037] A functionalized separator for lithium-sulfur batteries, comprising a base film, one side of the base film is provided with a conductive adsorption coating; the conductive adsorption coating includes a conductive powder carbon material and an adsorption inorganic polar material; The adsorbed inorganic polar material is obtained from the precursor after heat treatment.

[0038] The base film is Celgard commercial polypropylene (PP) membrane; the thickness of the base film is 25 μm. The conductive powder carbon material is Super P; the particle size of the adsorbed inorganic polar material is 0.10-5 μm.

[0039] The preparation method of the precursor includes the following steps: weigh 100g of nickel sulfate, stir and dissolve in 250ml of deionized water, continue to add 25g of sucrose, mechanically stir to dissolve, and control the spray inlet temperature at 160°C through a spray dryer. NiSO produced by discharge 4 / Sucrose precursor.

[0040] The preparation method of the f...

Embodiment 3

[0044] A functionalized separator for lithium-sulfur batteries, comprising a base film, one side of the base film is provided with a conductive adsorption coating; the conductive adsorption coating includes a conductive powder carbon material and an adsorption inorganic polar material; The adsorbed inorganic polar material is obtained from the precursor after heat treatment.

[0045] The base film is a Celgard commercial PP / PE / PP three-layer composite membrane; the thickness of the base film is 25 μm. The conductive powder carbon material is Super P; the particle size of the adsorbed inorganic polar material is 0.2-3 μm.

[0046] The preparation method of the precursor includes the following steps: weigh 100g of ferric nitrate and stir and dissolve it in 250ml of deionized water, continue to add 30g of melamine, mechanically stir and dissolve, and control the spray inlet temperature at 160°C through a spray dryer. Fe(NO 3 ) 3 / Melamine precursor.

[0047] The preparation method of ...

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Abstract

The invention provides a functionalized diaphragm for a lithium-sulfur battery, which comprises a base membrane, and a conductive adsorption coating is arranged above the base membrane; the conductiveadsorption coating comprises a conductive powder carbon material and an adsorption inorganic polar material; the adsorption inorganic polar material is obtained by carrying out heat treatment on a precursor. The functionalized diaphragm for the lithium-sulfur battery is composed of an inorganic polar material prepared by spray drying and a conductive carbon material, so a barrier layer for inhibiting shuttling of polysulfide in positive and negative electrodes can be established, conversion of polysulfide is catalyzed, the utilization rate of sulfur in a lithium-sulfur battery system is effectively increased, the specific capacity, the cycling stability and the thermal stability of the lithium-sulfur battery are improved, and the functionalized diaphragm has good electrochemical performance; the functional layer has double effects, namely, a strong polar substance adsorbs and anchors shuttled polysulfide, and can catalyze the conversion of the polysulfide.

Description

Technical field [0001] The invention belongs to the field of electrochemical technology, and particularly relates to a functionalized diaphragm for a lithium-sulfur battery and a preparation method thereof. Background technique [0002] Among commercial secondary batteries, lithium ion batteries are currently the highest energy density secondary batteries, but based on the "insertion-extraction" theory, the theoretical specific capacity of lithium ion batteries is currently less than 300mA h g -1 , The actual energy density is generally less than 200Wh kg -1 , Far from meeting the needs of long battery life. As a new type of electrochemical energy storage secondary battery, lithium-sulfur battery is different from traditional lithium ion "deintercalation" materials. During the discharge process, sulfur and metal lithium undergo a two-electron reaction, and the theoretical specific capacity is as high as 1675mAh g. -1 , The theoretical specific energy is as high as 2600Wh kg -1 At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/052
CPCH01M10/052H01M50/431H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 李婧徐周王美日崔洪涛刘媛媛
Owner YANTAI UNIV
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