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Preparation method of Sb<2>Se<3> composite material used for lithium-sulfur battery diaphragm

A technology for composite materials and lithium-sulfur batteries, which is applied to battery components, circuits, electrical components, etc., can solve problems such as polysulfide adsorption, achieve high production yield, improve utilization rate, enhance cycle performance and rate performance Effect

Active Publication Date: 2018-06-15
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the open architecture of most of these materials, the polysulfides cannot be effectively adsorbed in the positive electrode after long-term cycling.

Method used

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  • Preparation method of Sb&lt;2&gt;Se&lt;3&gt; composite material used for lithium-sulfur battery diaphragm
  • Preparation method of Sb&lt;2&gt;Se&lt;3&gt; composite material used for lithium-sulfur battery diaphragm

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Effect test

Embodiment 1

[0028] The present invention will be further described below in conjunction with specific embodiment:

[0029] Sb used in the present invention 2 Se 3 , pvp and GO suspensions were all purchased from the market.

[0030] The first step is to prepare Sb 2 Se 3 -pvp-rGO:

[0031] Weigh Sb 2 Se 3 Powder 0.20g, weigh 0.05g pvp, pour it into a beaker, add 49.75mL deionized water, and configure it as a mass fraction of 0.5% Sb 2 Se 3 -pvp suspension, using a magnetic stirrer to stir for 1h, then Sb 2 Se 3 - The pvp suspension was sonicated on an ultrasonic cell pulverizer for 30 minutes to disperse it evenly. Then mixed with graphene oxide aqueous solution, according to Sb 2 Se 3 -The mass ratio of pvp to graphene oxide is 1:1, measure 125mL graphene oxide aqueous phase dispersion (concentration is 2mg / mL), prepare Sb 2 Se 3 - The mixed dispersion of pvp-GO was magnetically stirred for 1 hour, then sonicated for 20 minutes using an ultrasonic cell disruptor, and then l...

Embodiment 2

[0039] Others are the same as embodiment 1, and the difference is the first step Sb 2 Se 3 - The mass ratio of pvp to graphene oxide is 1:1.5, and the dosage of hydrazine hydrate is 37.5 μL.

Embodiment 3

[0041] Others are the same as embodiment 1, and the difference is the first step Sb 2 Se 3 - The mass ratio of pvp to graphene oxide is 1:2, and the dosage of hydrazine hydrate is 50 μL.

[0042] figure 1 For the prepared Sb of Example 1 2 Se 3 - XRD pattern of pvp-rGO material. It can be seen from the figure that there is an obvious graphene peak at 23°, proving that rGO and Sb 2 Se 3 -pvp materials compound very well.

[0043] figure 2 For the prepared Sb of Example 1 2 Se 3 - The first charge-discharge curve of pvp-rGO material as a separator at 0.1C. The test equipment uses Xinwei BTS-2000, and the test is carried out at a constant room temperature (25°C). The constant current discharge voltage is set to 3.0V, and the charging voltage is set to 1.5V, so that the prepared lithium-sulfur battery can work in the voltage range of 1.5-3.0V. It can be seen from the figure that the charge and discharge specific capacities of the 60th cycle can still reach 1168 and 10...

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Abstract

The invention discloses a preparation method of a Sb<2>Se<3> composite material used for a lithium-sulfur battery diaphragm. According to the method, rod-like Sb<2>Se<3> is introduced to be used as asupporting framework of a graphene lamination layer, and a coating material structure is modified; Sb<2>Se<3>-pvp and graphene oxide are mixed at a certain proportion, and graphene oxide is reduced through hydrazine hydrate to obtain a dispersion liquid of the Sb<2>Se<3>-pvp and reduced graphene oxide; the dispersion liquid is subjected to spray drying to obtain solid powder, and then the solid powder is glued with a Celgard2400 diaphragm through a binder to prepare a Sb<2>Se<3>-pvp-rGO composite material diaphragm. The electrochemical performance of the lithium-sulfur battery is improved through a simple, convenient and low-cost method.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur battery separator materials, in particular to a Sb used for lithium-sulfur battery separators 2 Se 3 Preparation of composite materials to improve the electrochemical performance of lithium-sulfur batteries. Background technique [0002] The rapid development of the global economy has led to the continuous consumption of non-renewable energy, resulting in an energy crisis. In order to solve the energy crisis, the development and utilization of renewable energy generation represented by solar energy and wind energy has become a top priority. However, these natural energy sources including solar energy, wind energy, tidal energy, etc. are intermittent, and the amount of electric energy generated by them depends heavily on natural factors such as weather, season, time, and location. If these unstable electric energy is directly connected to the grid, it will seriously interfere with the nor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/414H01M50/431
CPCH01M50/446H01M50/403Y02E60/10
Inventor 张永光
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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