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Modified diaphragm special for Li-S battery, preparation method of modified diaphragm and Li-S battery

A lithium-sulfur battery and separator technology, which is applied in the field of lithium-sulfur batteries, can solve the problems of limited adsorption capacity and achieve the effects of simple preparation method, improved capacity and cycle life, and enhanced adsorption capacity

Active Publication Date: 2016-01-27
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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  • Modified diaphragm special for Li-S battery, preparation method of modified diaphragm and Li-S battery
  • Modified diaphragm special for Li-S battery, preparation method of modified diaphragm and Li-S battery
  • Modified diaphragm special for Li-S battery, preparation method of modified diaphragm and Li-S battery

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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

In a modified diaphragm special for a Li-S battery, the surface at one side, close to a positive electrode, of a general diaphragm is coated with a Ketjen black coated metal oxide modified coating layer added with a conductive agent. A preparation method of the modified diaphragm special for the Li-S battery comprises the following steps of sequentially mixing Ketjen black and an aqueous solution of a metal oxide inorganic salt, carrying out dispersion, drying and calcinations to prepare a paste, and applying the paste at one side, close to the positive electrode, of a commercial diaphragm to obtain the modified diaphragm. The invention also discloses the Li-S battery applying the modified diaphragm special for the Li-S battery. The Li-S battery is prepared by taking metal lithium as a negative electrode, applying a Ketjen balck-sulfur composite material onto an aluminum foil to serve as the positive electrode, taking a mixture of LiTFSI, lithium nitrate, 1,3-dioxolane and glycol dimethyl ether as an electrolyte and assembling the modified diaphragm special for the Li-S battery. With the modified diaphragm disclosed by the invention, a "shuttle effect" of polysulfide lithium in the Li-S battery can be prevented, the electrochemical performance and the capacity of the Li-S battery are improved, the cycle lifetime of the Li-S battery is prolonged, and the modified diaphragm is suitably used for production at a large scale.

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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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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