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Lithium-sulfur battery membrane and lithium-sulfur battery with same

A lithium-sulfur battery and diaphragm technology, applied in the field of lithium-sulfur batteries, can solve the problems of unsatisfactory lithium-sulfur batteries, polysulfide conversion and low utilization rate, and achieve the effects of superior conductivity, suppressing the shuttle effect, and improving utilization rate

Active Publication Date: 2017-05-31
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Recently, most of the modification methods for lithium-sulfur battery separators are to block polysulfides, but the conversion and utilization rate of polysulfides are low, and simple blocking adsorption cannot meet the needs of long-cycle and commercial lithium-sulfur batteries.

Method used

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  • Lithium-sulfur battery membrane and lithium-sulfur battery with same
  • Lithium-sulfur battery membrane and lithium-sulfur battery with same
  • Lithium-sulfur battery membrane and lithium-sulfur battery with same

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment provides a separator for a lithium-sulfur battery, which includes a separator base polyethylene porous membrane, and also includes a cover layer, the cover layer includes graphene and a heterojunction nanomaterial, and the heterojunction nanomaterial is a symbiotic rutile-type titanium dioxide- The mass ratio of titanium nitride, graphene and heterojunction nanomaterials is 9:1, and in the heterojunction nanomaterials, the mass ratio of rutile titanium dioxide to titanium nitride is 3:7.

[0032] Rutile titanium dioxide and titanium nitride are doped intergrowth structures, and there is a common interface between them.

[0033] The preparation method of heterojunction nanomaterials at least includes the following steps:

[0034] In the first step, urea is used as the nitrogen source, titanium tetrachloride is used as the titanium source, and the molar ratio of titanium tetrachloride and urea is controlled to be 1:8;

[0035] In the second step, disperse...

Embodiment 2

[0038]This embodiment provides a separator for a lithium-sulfur battery, which includes a separator base polypropylene porous membrane, and also includes a covering layer, the covering layer includes graphene and a heterojunction nanomaterial, and the heterojunction nanomaterial is a symbiotic rutile-type titanium dioxide- The mass ratio of titanium nitride, graphene and heterojunction nanomaterials is 9:1, and in the heterojunction nanomaterials, the mass ratio of rutile titanium dioxide to titanium nitride is 8:2.

[0039] Rutile titanium dioxide and titanium nitride are doped intergrowth structures, and there is a common interface between them.

[0040] The preparation method of heterojunction nanomaterials at least includes the following steps:

[0041] In the first step, urea is used as the nitrogen source, titanium tetrachloride is used as the titanium source, and the molar ratio of titanium tetrachloride and urea is controlled to be 1:8;

[0042] The second step is to ...

Embodiment 3

[0045] This embodiment provides a diaphragm for lithium-sulfur batteries, including a diaphragm substrate polyethylene / polypropylene composite diaphragm, and a covering layer, the covering layer includes graphene and heterojunction nanomaterials, and the heterojunction nanomaterials are symbiotic rutile Type titanium dioxide-titanium nitride, the mass ratio of graphene to heterojunction nanomaterials is 12:1, and in the heterojunction nanomaterials, the mass ratio of rutile titanium dioxide to titanium nitride is 5:5.

[0046] Rutile titanium dioxide and titanium nitride are doped intergrowth structures, and there is a common interface between them.

[0047] The preparation method of heterojunction nanomaterials at least includes the following steps:

[0048] In the first step, urea is used as the nitrogen source, titanium tetrachloride is used as the titanium source, and the molar ratio of titanium tetrachloride and urea is controlled to be 1:9;

[0049] The second step is t...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and relates to a membrane and for a lithium-sulfur battery. The membrane comprises a membrane body and a covering layer, the covering layer comprises graphene and heterojunction nano materials, the heterojunction nano materials are a symbiotic high adsorption phase-high conductivity phase, the mass ratio of the graphene to the heterojunction nano materials is (3-15):1, and the mass ratio of the high adsorption phase to the high conductivity phase is (1-10): (10-1). Relative to the prior art, according to the membrane, the covering layer is arranged on the membrane, electrochemistry and dynamics performances of the lithium-sulfur battery can be greatly improved, heterojunction nano materials specifically comprise the high adsorption phase and the high conductivity phase, the high adsorption phase has high adsorption action on polysulfide, the high conductivity phase has high conductivity action on the polysulfide, the polysulfide adsorbed by the high adsorption phase can be diffused on the surface of the high conductivity phase, so that transformation of the polysulfide is finished, adsorption and transformation at an interface between the high adsorption phase and the high conductivity phase can be finished, and the 'shuttling effect' of the polysulfide is restrained.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a diaphragm for lithium-sulfur batteries that can absorb polysulfides and effectively convert polysulfides, thereby improving the electrochemical performance of lithium-sulfur batteries, and a lithium-sulfur battery including the diaphragm. Background technique [0002] With the continuous development of electronic information technology, human beings have more urgent needs for long-life and high-capacity batteries. Lithium-sulfur batteries have received great attention because of their high theoretical specific capacity (1675mAh / g) and theoretical specific energy (2600Wh / Kg). . However, lithium-sulfur batteries also have many problems. For example, the "shuttle effect" of polysulfides will consume active materials and affect battery stability. Therefore, only by inhibiting the "shuttle effect" of polysulfides and promoting the conversion of polysulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/052B82Y30/00
CPCB82Y30/00H01M10/052H01M50/403H01M50/411H01M50/431Y02E60/10
Inventor 李宝华周天红吕伟杨全红李佳赵严
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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