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Sulfur positive electrode material with functional intermediate layer and preparation and application thereof

A technology of sulfur cathode material and intermediate layer, applied in the field of lithium-sulfur battery electrode materials, can solve the problems of affecting the cycle performance and Coulombic efficiency of Li-S batteries, irreversible damage of the cathode sulfur-containing structure, and difficulty in inhibiting the diffusion of polysulfides, etc. Achieve the effect of solving low cycle performance and low rate performance, suppressing shuttle effect, and mature production technology

Active 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

Parasitic reactions caused by polysulfide dissolution seriously affect the cycle performance and Coulombic efficiency of Li-S batteries
However, it is difficult for the existing lithium-sulfur battery separators to inhibit the diffusion of polysulfides, which in turn allows polysulfides to shuttle between the cathode and anode, resulting in irreversible destruction of the sulfur-containing structure of the cathode.
The shortcomings of the above-mentioned separators lead to a series of problems such as poor cycle stability and low actual specific capacity of lithium-sulfur batteries.

Method used

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  • Sulfur positive electrode material with functional intermediate layer and preparation and application thereof
  • Sulfur positive electrode material with functional intermediate layer and preparation and application thereof
  • Sulfur positive electrode material with functional intermediate layer and preparation and application thereof

Examples

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Effect test

Embodiment 1

[0039] A kind of preparation method that adopts commercial Kevlar fiber and transition metal salt solution as raw material to obtain dispersion liquid, and coats lithium-sulfur battery cathode material to form functional intermediate layer, comprises the following steps:

[0040] 1) Add 1.0g of Kevlar fiber and 1.5g of potassium hydroxide to 500mL of anhydrous dimethyl sulfoxide, stir and dissolve for 7 days to obtain a Kevlar nanofiber / dimethyl sulfoxide dispersion;

[0041]2) Dissolve 20 mg of nickel acetate in 10 mL of dimethyl sulfoxide, and add it dropwise to 30 mL of the Kevlar nanofiber / dimethyl sulfoxide dispersion obtained in step 1), stir at room temperature for 1 h, and then 30mL of deionized water was slowly added dropwise to the vigorously stirred mixed solution, reacted for 1 day, and obtained a composite dispersion of nickel hydroxide and Kevlar fiber-nickel ion fiber through simple solvent blending and in-situ reduction;

[0042] 3) 40mL of the nickel hydroxide...

Embodiment 2

[0056] A kind of preparation method that adopts commercial Kevlar fiber and transition metal salt solution as raw material to obtain dispersion liquid, and coats lithium-sulfur battery cathode material to form functional intermediate layer, comprises the following steps:

[0057] 1) Add 3.0g of Kevlar fiber and 1.5g of potassium hydroxide to 200mL of anhydrous dimethyl sulfoxide, stir and dissolve for 7 days to obtain a Kevlar nanofiber / dimethyl sulfoxide dispersion;

[0058] 2) Dissolve 60 mg of nickel acetate in 10 mL of dimethyl sulfoxide, and add it dropwise to 30 mL of the Kevlar nanofiber / dimethyl sulfoxide dispersion obtained in step 1), stir at room temperature for 1 h, and then 30mL of deionized water was slowly added dropwise to the vigorously stirred mixed solution, reacted for 1 day, and obtained a composite dispersion of nickel hydroxide and Kevlar fiber-nickel ion fiber through simple solvent blending and in-situ reduction;

[0059] 3) 40mL of the nickel hydroxid...

Embodiment 3

[0064] A kind of preparation method that adopts commercial Kevlar fiber and transition metal salt solution as raw material to obtain dispersion liquid, and coats lithium-sulfur battery cathode material to form functional intermediate layer, comprises the following steps:

[0065] 1) Add 2.0g of Kevlar fiber and 1.5g of potassium hydroxide to 400mL of anhydrous dimethyl sulfoxide, stir and dissolve for 7 days to obtain a Kevlar nanofiber / dimethyl sulfoxide dispersion;

[0066] 2) Dissolve 100 mg of nickel acetate in 10 mL of dimethyl sulfoxide, and add it dropwise to 30 mL of the Kevlar nanofiber / dimethyl sulfoxide dispersion obtained in step 1), stir at room temperature for 1 h, and then 30mL of deionized water was slowly added dropwise to the vigorously stirred mixed solution, reacted for 1 day, and obtained a composite dispersion of nickel hydroxide and Kevlar fiber-nickel ion fiber through simple solvent blending and in-situ reduction;

[0067] 3) 40mL of the nickel hydroxi...

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Abstract

The invention relates to a sulfur positive electrode material with a functional intermediate layer and preparation and application thereof, and the sulfur positive electrode material with the functional intermediate layer is prepared by taking commercial Kevlar fibers and a transition metal salt solution as raw materials. Compared with the modification of other lithium-sulfur batteries, due to a fact that the raw materials come from aramid fibers produced by Dupont Company and the production technology is mature, the material can be produced in a large scale, and the dissolving and compoundingsteps are simple; the preparation is easy, the sulfur positive electrode material with the functional middle layer obtained after coating and drying is applied to the lithium-sulfur battery, the cycle performance and the rate capability are greatly improved, the battery can also normally operate at the high temperature of 70 DEG C, and the applicable temperature interval of the lithium-sulfur battery is widened; the preparation method is simple, low in cost, excellent in performance and suitable for production of large-scale commercial batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery electrode materials, and relates to a sulfur cathode material with a functional intermediate layer and its preparation and application. Background technique [0002] Lithium-sulfur batteries use sulfur as the cathode and metallic lithium as the anode. During discharge, the anode reaction is that lithium loses electrons to become lithium ions, and the cathode reaction is that sulfur reacts with lithium ions and electrons to form sulfide. Due to the occurrence of multiple electron transfer reactions, it has a high theoretical specific capacity, with a specific capacity as high as 1672mAh / g. In addition, because sulfur has the characteristics of less environmental pollution, non-toxicity, low cost, and wide source of raw materials, lithium-sulfur batteries have received more and more attention. [0003] Separators are an important component in lithium-sulfur batteries, separating the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525
CPCH01M4/38H01M4/624H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 闵宇霖郑帅时鹏辉范金辰徐群杰朱晟
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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