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Modified diaphragm, preparation method thereof and lithium-sulfur battery

A lithium-sulfur battery and separator technology, applied in the field of new electrochemical materials, can solve the problems of complex process, disadvantageous large-scale production, etc., and achieve the effects of simple process, large-scale production, and improvement of specific capacity

Active Publication Date: 2021-07-27
素水新材料(上海)有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, patent CN111403663A discloses a modified lithium-sulfur battery diaphragm, which can solve the problem of lithium-sulfur battery shuttle effect by alternately suctioning Ce-MOF and CNTs on a common commercial diaphragm, and improve the specific capacity of the battery. Coulombic efficiency and cycle life; however, such a process requires alternate laying of Ce-MOF-derived and oxygen-vacancy-rich CeO 2-x / C material layer and activated CNTs layer as a composite modification layer, the process is relatively complicated, which is not conducive to large-scale production. Therefore, it is necessary to develop and design a simpler and more effective diaphragm modification method

Method used

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  • Modified diaphragm, preparation method thereof and lithium-sulfur battery

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Embodiment 1

[0028] This embodiment provides a modified diaphragm for lithium-sulfur batteries, which includes a basic diaphragm and a modified layer of composite material, the modified layer of composite material is arranged on one side of the basic diaphragm, and the modified layer of composite material is The composition of the layer includes conductive agent and Cu 2 TCPP-MOF. Among them, Cu 2 TCPP-MOF has exposed N sites, which can be effectively combined with polysulfides to block it and weaken the shuttle effect of lithium-sulfur batteries; conductive agents are used to provide conductivity and promote electron transfer, and the combination of the two greatly improves The specific capacity, rate performance, Coulombic efficiency, and cycle stability of lithium-sulfur batteries were investigated.

[0029] Optionally, the basic diaphragm is a polyethylene (PE) diaphragm, a polypropylene (PP) diaphragm, a PE / PP composite single-layer diaphragm, etc., and may be one or more of them. ...

Embodiment 2

[0048] The preparation method of this example is the same as that of Example 1, except that the Cu loaded on the Celgard 2500 diaphragm 2 The mass ratio of TCPP-MOF and GO is 1:2, and other implementation conditions are the same.

[0049] Compared with Example 1, the specific capacity, cycle stability, and rate performance of the lithium-sulfur battery assembled with the modified diaphragm of this example are similar and slightly improved. Charge and discharge at 1C constant current, the initial capacity reaches 978mAh / g, the capacity is still 571mAh / g after 500 cycles, the capacity retention rate is 58%, and the rate performance is also improved accordingly.

Embodiment 3

[0051] The preparation method of this example is the same as that of Example 1, except that the Cu loaded on the Celgard 2500 diaphragm 2 The mass ratio of TCPP-MOF and GO is 1:3, and other implementation conditions are the same.

[0052] Compared with Example 1, the specific capacity, cycle stability and rate performance of the lithium-sulfur battery assembled with the modified diaphragm of this example are similar, but slightly improved. Charge and discharge at 1C constant current, the initial capacity reaches 966mAh / g, and the capacity is still 554mAh / g after 500 cycles, the capacity retention rate is 57%, and the rate performance is also improved accordingly.

[0053] Above-mentioned embodiment 1-embodiment 3 illustrate the specific capacity of lithium-sulfur battery, cycle stability and rate performance and Cu on the base separator 2 The mass ratio of TCPP-MOF and GO is not positively correlated, but has a preferred area. The present invention has found through many expe...

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Abstract

The invention discloses a modified diaphragm and a preparation method thereof and a lithium-sulfur battery, and belongs to the technical field of electrochemical new materials. The modified diaphragm is composed of a basic diaphragm and a composite material modified layer, and the composite material modified layer is formed by compounding a porphyrin-based MOF material and a conductive agent. The preparation method mainly comprises the following steps of preparing a composite material of Cu2TCPP-MOF and a conductive agent by taking meso-tetra (4-carboxyphenyl) porphin, copper nitrate trihydrate, the conductive agent such as graphene and a carbon nanotube as raw materials, and loading the composite material on the surface of the basic diaphragm through suction filtration to finally prepare the modified diaphragm. When the modified diaphragm prepared by the method is applied to the lithium-sulfur battery, the shuttle effect of the lithium-sulfur battery can be inhibited, and the specific capacity, the cycling stability and the rate capability of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of new electrochemical materials, in particular to a modified diaphragm, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] Coal, oil and other fossil energy consumption in today's world is huge, and the development and utilization of renewable and clean energy is an important measure to improve the energy structure and ensure energy security. As an effective medium for energy storage and release, battery systems are currently the research focus of the new energy industry. Since the commercialization of lithium-ion batteries, they have been widely used due to their advantages of light weight, environmental protection, and long life. However, their theoretical energy density is still difficult to fully meet large-scale industrial applications, such as electric vehicles. [0003] In response to this, the researchers found some alternative battery systems. Among them, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/414H01M50/431H01M10/052
CPCH01M10/052Y02E60/10
Inventor 翟凤霞
Owner 素水新材料(上海)有限公司
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