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A kind of sulfur cathode material with functional intermediate layer and its preparation and application

A sulfur cathode material and intermediate layer technology, applied in the field of lithium-sulfur battery electrode materials, can solve the problems affecting the cycle performance and coulombic efficiency of Li-S batteries, the irreversible damage of the sulfur-containing structure of the cathode, and the poor cycle stability of lithium-sulfur batteries. Effects of suppressing the shuttle effect, mature production technology, and widening the applicable temperature range

Active Publication Date: 2021-07-20
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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  • A kind of sulfur cathode material with functional intermediate layer and its preparation and application
  • A kind of sulfur cathode material with functional intermediate layer and its preparation and application
  • A kind of sulfur cathode material with functional intermediate layer and its preparation and application

Examples

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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 cathode material with a functional intermediate layer and its preparation and application. Commercial Kevlar fibers and transition metal salt solutions are used as raw materials to prepare the sulfur cathode material with a functional intermediate layer. Compared with the modification of other lithium-sulfur batteries, the present invention has mature production technology and can be used in large-scale production because the raw material comes from the aramid fiber produced by DuPont. The sulfur cathode material with a functional intermediate layer obtained after drying is used in lithium-sulfur batteries, its cycle performance and rate performance have been greatly improved, and the battery can also operate normally at a high temperature of 70 ° C, which broadens the scope of lithium-sulfur batteries. Applicable temperature range; the preparation method is simple, the cost is low, the performance is excellent, and it is suitable for the 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 Patents(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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