Composite diaphragm used for lithium-sulfur battery, preparation method and application thereof

A lithium-sulfur battery and composite separator technology, which is applied in the field of energy materials, can solve the problems of low Coulomb efficiency, poor electronic and ionic conductivity, and hinder the commercialization of lithium-sulfur batteries, and achieves simple and controllable processes, low cost, and benefits The effect of large-scale implementation

Inactive Publication Date: 2016-10-05
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in lithium-sulfur batteries, the electronic conductivity and ion conductivity of sulfur and the final discharge product lithium polysulfide are very poor, and the volume expansion and contraction during charge and discharge and the dissolution of the intermediate product lithium polysulfide in the organic electrolyte produce Coulomb The low-efficiency "flying shuttle effect" is the three main problems that hinder the commercialization of lithium-sulfur batteries

Method used

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  • Composite diaphragm used for lithium-sulfur battery, preparation method and application thereof
  • Composite diaphragm used for lithium-sulfur battery, preparation method and application thereof
  • Composite diaphragm used for lithium-sulfur battery, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 with 1mg TiO 2 Microspheres (particle size 900nm-1.1μm, specific surface area 17.3m 3 / g) Ultrasonic dispersion in water, then suction filtration on a commercial glass fiber membrane (Whatman, GF / A), vacuum drying for 24 hours, and then the composite membrane (barrier layer thickness about 10 μm) was assembled as a separator for a lithium-sulfur battery The 2032 button cell was tested for battery performance and compared with a 2032 button cell constructed with the same glass fiber separator at the same current density (1A / g). And, under the same current density (1A / g) in the non-sulfurized electrode, the contribution of the solid inorganic compound on the composite separator to the capacity was tested. The discharge specific capacity is only 84.7mAh / g after 100 cycles at a current density of 1A / g without a composite separator at a current density of 0.1A / g; while the spherical titanium dioxide / glass fiber composite separator is used at 0.1A The first dischar...

Embodiment 2

[0038] Embodiment 2 will 1mg flower-like TiO 2 Microspheres (particle size 900nm-1.1μm, specific surface area 99.2m 3 / g), and then suction-filtered (Whatman, GF / A) on a commercial glass fiber separator, vacuum-dried for 24 hours, and then assembled the composite film (barrier layer thickness about 10 μm) into a 2032-type button battery as a separator of a lithium-sulfur battery The battery performance test was carried out and compared with the battery performance of a 2032 button cell constructed with the same glass fiber separator at the same current density (1A / g). And, under the same current density (1A / g) in the non-sulfurized electrode, the contribution of the solid inorganic compound on the composite separator to the capacity was tested. The flower-shaped titanium dioxide / glass fiber composite separator is used for the first discharge of 1438.1mAh / g at a current density of 0.1A / g, and the discharge specific capacity is 281.9mAh / g after 100 cycles at a current density o...

Embodiment 4

[0040] Example 4 with 1.5mg Ti 3 C 2 Nanosheets (particle size 1 μm-1.5 μm) were ultrasonically dispersed in water and then suction-filtered on a commercial glass fiber separator, vacuum-dried for 24 hours, and then the composite film (barrier layer thickness about 20 μm) was assembled as a separator of a lithium-sulfur battery into a 2032 Type button battery is carried out battery performance test, and with the 10 μ m thick Ti in embodiment 3 3 C 2 / Glass fiber composite separator to compare the battery performance of the 2032 button at the same current density (1A / g). 10μm thick Ti 3 C 2 / Glass fiber composite separator is 1555.7mAh / g at the first discharge at a current density of 0.1A / g, and the discharge specific capacity is 580.2mAh / g after 60 cycles at a current density of 1A / g, 20μm thick Ti 3 C 2 / Glass fiber composite separator at a current density of 0.1A / g is 1570.1mAh / g for the first time, and after 60 cycles at a current density of 1A / g, the discharge specif...

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Abstract

The invention discloses a composite diaphragm used for a lithium-sulfur battery, a preparation method and an application thereof. The composite diaphragm comprises the diaphragm and a barrier layer deposited on the diaphragm, wherein, the barrier layer is mainly composed of solid-state inorganic compounds having polysulfide absorption capability. The diaphragm employs a commercial battery diaphragm, the solid-state inorganic compound comprises the multielement compound containing a metallic element or containing no metallic element. The method comprises the following steps: providing the commercial battery diaphragm, at least depositing the solid-state inorganic compounds having the polysulfide absorption capability on the commercial battery diaphragm to form the barrier layer, and obtaining the composite diaphragm used for the lithium-sulfur battery. The composite diaphragm used for the lithium-sulfur battery can effectively solve the instability of the lithium-sulfur battery in a commercial application, performance of the lithium-sulfur battery can be greatly increased, the preparation method has the advantages of simple and controllable performances, economy, and environmental pollution, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a lithium battery, in particular to a composite diaphragm that can be used to improve the performance of a lithium-sulfur battery and a preparation method thereof, belonging to the technical field of energy materials. Background technique [0002] With the continuous increase of people's demand for energy and the continuous improvement of consumption quality, the storage and conversion capacity of electric energy is required to be larger and larger. Based on the lithium ion intercalation and deintercalation lithium storage mechanism, the capacity of the traditional commercial lithium-ion battery with lithium cobaltate as the positive electrode and graphite as the negative electrode is increasingly unable to meet market demand, especially for the field of new energy vehicles. Even more so. Therefore, positive and negative electrode materials based on the conversion reaction mechanism for storing lithium have attracted more and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/052H01M50/403H01M50/431H01M50/446
CPCY02E60/10
Inventor 靳健林冲
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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