Perovskite oxide modified diaphragm material for lithium-sulfur battery and lithium-sulfur battery

A perovskite oxide, lithium-sulfur battery technology, applied in the direction of cylindrical shell batteries/batteries, battery electrodes, nanotechnology for materials and surface science, etc., can solve lithium metal negative electrode corrosion, battery deactivation, capacity drop and other issues

Pending Publication Date: 2020-07-14
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shuttle effect not only causes corrosion and severe self-discharge phenomenon of lithium metal anodes, but also leads to a large amount of sulfur loss, a rapid decline in capacity, and eventually deactivation of the battery.

Method used

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  • Perovskite oxide modified diaphragm material for lithium-sulfur battery and lithium-sulfur battery
  • Perovskite oxide modified diaphragm material for lithium-sulfur battery and lithium-sulfur battery
  • Perovskite oxide modified diaphragm material for lithium-sulfur battery and lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of a titanium oxide-modified membrane:

[0039] (1) Perovskite oxide La 0.65 Sr 0.35 MnO 3 synthesis method

[0040] Taking lanthanum nitrate as the measurement basis, dissolve 0.65mmol of lanthanum nitrate, 0.25mmol of strontium nitrate, 0.35mmol of manganese acetate and 1.25mmol of citric acid in deionized water, and slowly add 0.3mmol of ethylene glycol solution dropwise, Stir until clarification, and then stir the obtained clear solution at a high temperature of 60-100°C to form a gel; the obtained gel is carbonized at a high temperature of 600-800°C in air to obtain the target product (La 0.65 Sr 0.35 MnO 3 ).

[0041] (2) La 0.65 Sr 0.35 MnO 3 , the conductive agent carbon nanotubes and the binder Nafion are dissolved in ethanol according to the mass ratio of 8:1:1 and ultrasonicated for a certain period of time; the PP diaphragm is used as a filter paper for vacuum filtration for a certain period of time to obtain a functional diaphr...

Embodiment 2

[0044] A method for preparing a titanium oxide-modified diaphragm and an example of a lithium-sulfur battery with the modified diaphragm.

[0045] The perovskite oxide La prepared as in Example 1 0.65 Sr 0.35 MnO 3 Nanoparticles, conductive agent carbon nanotubes and binder Nafion are dissolved in ethanol according to the mass ratio of 7:2:1 and ultrasonicated for a certain period of time; vacuum filtration is carried out for a certain period of time with PP diaphragm as filter paper to obtain the function of using PP diaphragm as the base sex diaphragm. Put the separator in an oven at 60° C. to dry for 24 hours, and punch the obtained modified separator into a disc with a diameter of 16 mm.

[0046] image 3 (a) is the photo of the perovskite oxide obtained in Example 2 after being folded in half for many times, and (b) is the photo of the perovskite oxide obtained in Example 2 after being folded in half for many times and finally recovers itself Expanded photo. The coati...

Embodiment 3

[0050] A preparation method of a titanium oxide-modified diaphragm:

[0051] With reference to the La prepared in Example 1 0.65 Sr 0.35 MnO 3 Nanoparticles, conductive agent carbon nanotubes and binder Nafion are dissolved in ethanol according to the mass ratio of 6:3:1 and ultrasonicated for a certain period of time; vacuum filtration is carried out for a certain period of time with PP diaphragm as filter paper to obtain the function of using PP diaphragm as the base sex diaphragm. Put the separator in an oven at 60° C. to dry for 24 hours, and punch the obtained modified separator into a disc with a diameter of 16 mm.

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Abstract

The invention relates to a perovskite oxide modified diaphragm material for a lithium-sulfur battery and the lithium-sulfur battery. The diaphragm material comprises a diaphragm body as a substrate and a modified coating coated on the surface of one side of the diaphragm body, and the modified coating is composed of La0.65Sr0.35MnO3 nanoparticles, a conductive agent and a binder. Compared with theprior art, the diaphragm material provided by the invention can effectively inhibit the shuttle effect rate in the charging and discharging process of the existing lithium-sulfur battery, and realizes high circularity and long service life.

Description

technical field [0001] The invention belongs to the technical field of diaphragm materials for lithium-sulfur batteries, and relates to a perovskite oxide-modified diaphragm material for lithium-sulfur batteries and a lithium-sulfur battery. Background technique [0002] Li-S batteries based on multiple electron conversion can achieve high energy density (2600Wh kg -1 ), which has received much attention in emerging applications such as electric vehicles and drones. More importantly, elemental sulfur has the characteristics of low cost and environmental friendliness. Therefore, it has great potential for practical application, but some problems still need to be solved to solve its commercial application. The most serious problem in lithium-sulfur batteries is the "shuttling effect", which is caused by long-chain polysulfides (Li 2 S n , 4≤n≤8) are highly soluble and diffused to the lithium anode through the separator. The shuttling effect not only causes corrosion and s...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M4/139H01M4/1393H01M4/13H01M4/133H01M10/0525H01M10/04B82Y30/00H01M50/403H01M50/431H01M50/443H01M50/449H01M50/489
CPCH01M4/139H01M4/1393H01M10/0525H01M10/0427B82Y30/00H01M2004/028H01M50/403H01M50/431H01M50/446Y02E60/10Y02P70/50
Inventor 闵宇霖张宇鹏柴媛时鹏辉范金辰徐群杰朱晟
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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