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Lithium-sulfur battery positive electrode material as well as preparation method and application thereof

A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of active material loss and "shuttle effect", restricting the development of lithium-sulfur secondary batteries, and reducing the storage efficiency of charge and discharge , achieving excellent cycle stability, avoiding the shuttle effect, and high discharge capacity

Active Publication Date: 2019-04-02
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the application and development of lithium-sulfur batteries have encountered many problems: first, elemental sulfur (5×10 -30 S cm -1 ) and its discharge product Li 2 S is an electronic and ion insulator, and the electrochemical activity of the sulfur electrode is extremely low; secondly, lithium polysulfide, an intermediate product of sulfur electrode discharge, is easily dissolved in the organic electrolyte, resulting in the loss of active materials and the "shuttle effect", which leads to a rapid increase in battery capacity. In addition, the huge volume change of the sulfur electrode during the charging and discharging process will also lead to the destruction of the mechanical properties of the electrode and accelerate the decline of battery performance
The above problems have seriously restricted the development of lithium-sulfur secondary batteries.

Method used

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  • Lithium-sulfur battery positive electrode material as well as preparation method and application thereof
  • Lithium-sulfur battery positive electrode material as well as preparation method and application thereof

Examples

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Embodiment 1

[0027] Example 1: A preparation method of lithium-sulfur battery cathode material,

[0028] Step 1: Preparation of precursor solution:

[0029] Dissolve 1.78g of sodium carbonate in 100mL of deionized water, stir for 30min to completely dissolve to obtain a sodium carbonate aqueous solution, then mix the sodium carbonate aqueous solution with 100mL of ammonia water with a concentration of 5moL / L, and stir for 30min until fully mixed to form a uniform mixed solution A .

[0030] Step 2: Preparation of layered porous Zn-Al double hydroxide:

[0031] Put the zinc foil with the size of 30mm×30mm×0.25mm and the carbon-containing aluminum foil with the size of 30mm×30mm×0.15mm into the above homogeneous mixed solution A, and then let it stand at room temperature for 2 days. Take out the carbon-containing aluminum foil from the solution, wash the carbon-containing aluminum foil 4 times with deionized water, and finally dry it in an oven at 60° C. to obtain a layered porous structure Zn-Al d...

Embodiment 2

[0035] Embodiment 2: A preparation method of lithium-sulfur battery cathode material

[0036] Step 1: Preparation of precursor solution:

[0037] Dissolve 1.78g of sodium carbonate in 100mL of deionized water, stir for 30 minutes to completely dissolve to obtain a sodium carbonate aqueous solution, then mix the sodium carbonate aqueous solution with 100mL of ammonia water with a concentration of 10moL / L, and stir for 60 minutes until fully mixed to form a uniform mixed solution A .

[0038] Step 2: Preparation of layered porous Zn-Al double hydroxide:

[0039] Put a zinc foil with a size of 30mm×30mm×0.25mm and a carbon-containing aluminum foil with a size of 30mm×30mm×0.15mm into the above-mentioned homogeneous mixed solution A, and then stand at room temperature for 4 days. Take out the carbon-containing aluminum foil from the solution, wash the carbon-containing aluminum foil 6 times with deionized water, and finally dry it in an oven at 80° C. to obtain a layered porous structure...

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Abstract

The invention belongs to the technical field of electrode preparation, and particularly relates to a lithium-sulfur battery positive electrode material as well as a preparation method and an application thereof. Considering that a one-dimensional electrode material has the advantages of large specific surface area and high electronic conductivity and advantages in the aspects of constructing a conductive network and buffering the volume expansion of an electrode, a e layered porous structure Zn-Al double hydroxide positive electrode material is prepared by a simple co-precipitation method; thepreparation method is the preparation method of the Zn-Al double hydroxide positive electrode material with the characteristics of high yield, industrial feasibility and the like. The co-precipitation method adopted in the Zn-Al double hydroxide positive electrode material is easy and effective, so that large scale and low cost industrialization of the Zn-Al double hydroxide positive electrode material can be realized easily.

Description

Technical field [0001] The invention belongs to the technical field of electrode preparation, in particular to a lithium-sulfur battery positive electrode material and a preparation method and application. Background technique [0002] In recent years, due to the rapid development of advanced portable electronic products, electric vehicles and energy storage power stations, there is an urgent need to develop a secondary battery system with high energy density, long life, and low cost. Lithium-sulfur batteries not only have a theoretical specific energy of up to 2600Wh / kg, but elemental sulfur as a cathode material also has the advantages of low price, rich resources and environmental friendliness. Therefore, lithium-sulfur batteries are the focus of the development of next-generation secondary batteries. [0003] However, the application and development of lithium-sulfur batteries has encountered many problems: First, elemental sulfur (5×10 -30 S·cm -1 ) And its discharge product L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y40/00
CPCH01M4/366H01M4/38H01M4/624H01M4/628H01M10/0525B82Y40/00Y02E60/10
Inventor 张永光崔国梁
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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