Modified diaphragm for lithium-sulfur battery, preparation method thereof and lithium-sulfur battery with diaphragm

A lithium-sulfur battery and diaphragm technology, applied in the field of energy materials, can solve the problems of poor cycle stability, unsatisfactory improvement of battery electrochemical performance, poor conductivity, etc., to improve cycle life, facilitate large-scale implementation, and eliminate surface blunt effect

Inactive Publication Date: 2017-11-17
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The research paper (Carbon, 2016, 101: 272-280) introduces the application of polyacrylonitrile / graphene oxide modified separator in lithium-sulfur batteries. The content of sulfur in the positive electrode active material is 70%, although 100 cycles at 0.2 C Achieved 987 mAh·g in the cycle -1 The specific capacity of the first release, but the average capacity decay rate per cycle is as high as 0.395%, and the cycle stability is poor
However, the modified layer of these non-polar carbon-based materials can only provide a weak physical effect to confine polysulfide ions, and the material itself has poor conductivity, which is not ideal for improving the electrochemical performance of the battery.
Polar metal oxides have attracted widespread attention due to their strong bonding with polysulfides. 2 o 3 The lithium-sulfur battery with the modified diaphragm has only 60% sulfur content in the active material, but at a rate of 0.2 C, the first-cycle discharge specific capacity is 967 mAh g -1 , the capacity decay rate of each cycle is as high as 0.77%, and the cycle stability is poor

Method used

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

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Embodiment 1

[0038] A molybdenum oxide (MoO 3 ) The preparation method of the modified separator and the example of the lithium-sulfur battery with the modified separator.

[0039] Molybdenum oxide (MoO 3 ) synthesis method

[0040] 0.4 mmol of (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in 20 mL of deionized water and stirred continuously at room temperature for 30 min to obtain a precursor solution of molybdic acid, and then 10 mL of HNO was added to the solution 3 , followed by stirring for 30 min. Transfer the resulting mixed solution to a 50 mL polytetrafluoroethylene liner, then put it into a stainless steel autoclave, and put it into a 160-200 o React in an oven at C for 18-24 h, and cool naturally to room temperature. After filtering, wash thoroughly with ultrapure water and ethanol, collect samples, and place them in 60-100 o Dry in an oven at C for 12-24 h;

[0041] Molybdenum oxide (MoO 3 ) Modified separator: the hydrothermally synthesized molybdenum oxide (MoO 3 ) of ...

Embodiment 2

[0049] A molybdenum oxide (MoO 3 ) The preparation method of the modified separator and the example of the lithium-sulfur battery with the modified separator.

[0050] Preparation of modified separator: molybdenum oxide (MoO 3 ) nanoribbons, conductive carbon black (Super P) and binder according to the mass ratio of 7:2:1, placed in the sample tube, and mixed evenly under the condition of strong magnetic stirring for 90 min to form a slurry. The slurry was evenly coated on the battery separator (Celgard 2300) with a doctor blade coating method, the coating thickness was 50 μm, and the coated separator was placed in 60 o C in an oven for 24 h, and finally the dried membrane was cut into 16 mm diameter discs for later use.

[0051] Preparation of CNT / S composite: Weigh 50 mg of sulfur and add it to 220 mL of ethanol, sonicate in a 1500 W ultrasonic instrument for 10 min until the sulfur is completely dissolved in ethanol, add 117 mg of CNT to the solution, Continue to sonicat...

Embodiment 3

[0057] A molybdenum oxide (MoO 3 ) The preparation method of the modified separator and the example of the lithium-sulfur battery with the modified separator.

[0058] Preparation of modified separator: molybdenum oxide (MoO 3 ) nanoribbons, conductive carbon black (Super P) and binder according to the mass ratio of 6:3:1, placed in the sample tube, and mixed evenly under the condition of strong magnetic stirring for 90 min to form a slurry. The slurry was evenly coated on the battery separator (Celgard 2300) with a doctor blade coating method, the coating thickness was 50 μm, and the coated separator was placed in 60 o C in an oven for 24 h, and finally the dried membrane was cut into 16 mm diameter discs for later use.

[0059] Preparation of CNT / S composite: Weigh 50 mg of sulfur and add it to 220 mL of ethanol, sonicate in a 1500 W ultrasonic instrument for 10 min until the sulfur is completely dissolved in ethanol, add 117 mg of CNT to the solution, Continue to sonicat...

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Abstract

The invention belongs to the technical field of energy materials, and specifically relates to a modified diaphragm for a lithium-sulfur battery, a preparation method of the modified diaphragm and the lithium-sulfur battery with the diaphragm; the diaphragm adopts a diaphragm body of a commercial battery as a skeleton, and a decorative coating is coated on one side of the diaphragm body; and the decorative coating consists of nanometer inorganic particles containing molybdenum element, a conductive agent and a binder. Through the diaphragm for the commercial battery and the nanometer inorganic particles containing molybdenum element as raw material and a proportional relation among the raw materials, the composite diaphragm for the lithium-sulfur battery is formed through a simple technology, the technology is simple and controllable, a complex and energy-consuming sulfur-filling process is not needed, the raw materials are wide in sources, the cost is low, and the technology is beneficial for large-scale implementation. The lithium-sulfur assembled in the invention is high in capacity and good in cycle performance, and the preparation technology is simple and controllable, economical and environmentally-friendly, and is applicable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a modified diaphragm for a lithium-sulfur battery, a preparation method thereof, and a lithium-sulfur battery with the diaphragm. Background technique [0002] With the rapid development of modern society, people's demand for energy continues to increase. The growing environmental problems and the continuous consumption of fossil energy have made the use of traditional fuel vehicles controversial, and pure electric vehicles powered by chemical power sources have emerged as the times require. The battery is the core component of electric vehicles and electric devices, and its performance determines the application and development of the electric device system, that is, the electric energy storage device requires more and more storage and conversion capacity of electric energy. Lithium-sulfur battery is a new type of chemical battery with metallic lithium as t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M4/139H01M4/1393H01M4/36H01M4/38H01M4/587H01M10/0525B82Y30/00H01M50/403H01M50/431H01M50/443H01M50/449
CPCH01M4/139H01M4/1393H01M4/364H01M4/38H01M4/587H01M10/0525B82Y30/00H01M50/446H01M50/403Y02E60/10
Inventor 张昭良孙丹辛颖李倩
Owner UNIV OF JINAN
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