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A special modified diaphragm for lithium-sulfur battery and its preparation method and lithium-sulfur battery

A lithium-sulfur battery and separator technology, applied in the field of lithium-sulfur batteries, can solve problems such as limited adsorption capacity, and achieve the effects of simple preparation method, good chemical stability, and high electrical conductivity

Active Publication Date: 2017-11-17
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption of these conductive polymer materials and porous carbon materials on lithium polysulfide is mostly a physical adsorption based on van der Waals force, and the adsorption capacity is limited.

Method used

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  • A special modified diaphragm for lithium-sulfur battery and its preparation method and lithium-sulfur battery
  • A special modified diaphragm for lithium-sulfur battery and its preparation method and lithium-sulfur battery
  • A special modified diaphragm for lithium-sulfur battery and its preparation method and lithium-sulfur battery

Examples

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Embodiment 1

[0035] A special modified diaphragm for lithium-sulfur batteries of the present invention, comprising commercial diaphragm Celgard2400 and a modified coating coated on the surface of the commercial diaphragm Celgard2400 near the positive electrode, the modified coating is Ketjen black coated with Ketjen black-oxidized Manganese coating; the conductive agent Super-P is added to the modified coating; the thickness of the modified coating is 100 μm; the mass ratio of Ketjen black to metal oxide in the modified coating is about 5:1.

[0036] The preparation method of the special modified diaphragm for lithium-sulfur battery in this embodiment includes the following steps:

[0037] (1) 0.3g manganese sulfate is dissolved in 100mL ultrapure water to form solution A;

[0038] (2) Add 1 g of Ketjen Black to Solution A, and ultrasonically disperse for 2 hours with 500W of ultrasonic power;

[0039] (3) Suction filter the solution obtained in step (2) and dry in an oven at 80° C. for 2...

Embodiment 2

[0050] A special modified diaphragm for lithium-sulfur batteries of the present invention, comprising commercial diaphragm Celgard2400 and a modified coating coated on the surface of the commercial diaphragm Celgard2400 near the positive electrode, the modified coating is Ketjen black coated with Ketjen black-oxidized Manganese coating; the conductive agent Super-P is added to the modified coating; the thickness of the modified coating is 100 μm; the mass ratio of Ketjen black to metal oxide in the modified coating is about 4:1.

[0051] The preparation method of the special modified diaphragm for lithium-sulfur battery in this embodiment comprises the following steps:

[0052] (1) 0.4g manganese nitrate is dissolved in 100mL ultrapure water to form solution A;

[0053] (2) Add 1 g of Ketjen Black to Solution A, and ultrasonically disperse for 2 hours with 500W of ultrasonic power;

[0054] (3) Suction filter the solution obtained in step (2) and dry in an oven at 80° C. for ...

Embodiment 3

[0064] A special modified diaphragm for lithium-sulfur batteries of the present invention, comprising commercial diaphragm Celgard2400 and a modified coating coated on the surface of the commercial diaphragm Celgard2400 near the positive electrode, the modified coating is Ketjen black coated with Ketjen black-oxidized Lanthanum coating; the conductive agent Super-P is added to the modified coating; the thickness of the modified coating is 100 μm; the mass ratio of Ketjen black to metal oxide in the modified coating is about 3:1.

[0065] The preparation method of the special modified diaphragm for lithium-sulfur battery in this embodiment comprises the following steps:

[0066] (1) 0.4g lanthanum nitrate is dissolved in 100mL ultrapure water to form solution A;

[0067] (2) Add 1 g of Ketjen Black to Solution A, and ultrasonically disperse for 2 hours with 500W of ultrasonic power;

[0068] (3) Suction filter the solution obtained in step (2) and dry in an oven at 80° C. for ...

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Abstract

A special modified separator for lithium-sulfur batteries, in which a layer of Ketjen Black-coated metal oxide modified coating added with a conductive agent is coated on the surface of an ordinary separator near the positive electrode. The preparation method of the special modified diaphragm for lithium-sulfur batteries includes mixing Ketjen Black and an aqueous solution of metal oxide inorganic salts in sequence, and after dispersing, drying, and calcining, the slurry is prepared and coated on the side of the commercial diaphragm near the positive electrode and baked. What you get. The invention also discloses a lithium-sulfur battery using a special modified diaphragm for lithium-sulfur batteries. Metal lithium is used as the negative electrode, Ketjen black-sulfur composite material is coated on the aluminum foil as the positive electrode, and bistrifluoromethanesulfonic acid imide A mixture of lithium, lithium nitrate, 1,3-dioxolane and ethylene glycol dimethyl ether is used as the electrolyte, and the special modified diaphragm for the lithium-sulfur battery is assembled. The modified diaphragm of the invention can suppress the "shuttle effect" of lithium polysulfide in the lithium-sulfur battery, improve the electrochemical performance, capacity and cycle life of the lithium-sulfur battery, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a modified diaphragm specially used for lithium-sulfur batteries, a preparation method thereof and a lithium-sulfur battery composed of the same. Background technique [0002] Lithium-sulfur (Li-S) battery is a new type of electrochemical energy storage system with lithium as the negative electrode (theoretical specific capacity 3860mAh / g) and sulfur as the positive electrode (theoretical specific capacity 1675mAh / g). The theoretical specific energy can reach 2600Wh / g. kg, which is much larger than the commercial lithium-ion batteries at this stage, and the characteristics of sulfur, which are abundant, cheap, and low-toxic or non-toxic, make this system extremely commercially valuable. However, there are many serious problems in the electrochemistry of lithium-sulfur batteries that need to be solved urgently. First of all, the conductivity of the active substance sulfur and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/40H01M50/403H01M50/431
CPCH01M10/0525H01M50/403H01M50/446Y02E60/10
Inventor 钱昕晔沈湘黔赵迪杨晓龙王善文姚山山饶德伟周友元习小明
Owner CHANGSHA RES INST OF MINING & METALLURGY
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