Lithium-sulphur battery cathode material and preparation method thereof

A cathode material, lithium-sulfur battery technology, applied in the field of material chemistry, can solve the problems of obvious shuttle effect, poor cycle stability, low sulfur load, etc., and achieve the effects of shortened transmission path, good cycle life, and high specific capacity

Active Publication Date: 2019-05-14
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

[0004] The present invention aims at the problems of low sulfur loading capacity, obvious shuttle effect, poor cycle stability and the like existing in the...

Method used

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  • Lithium-sulphur battery cathode material and preparation method thereof

Examples

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Embodiment 1

[0023] (1) Preparation of nickel oxide double-layer hollow spheres:

[0024] 15 g of glucose was dissolved in 150 mL of deionized water, placed in a reaction kettle, and hydrothermally reacted at 180° C. for 3 hours. After the reaction was completed, it was cooled at room temperature. The obtained suspension was centrifuged to collect the product, washed three times with deionized water, and dried at 60° C. to obtain carbon sphere powder for later use. Take 1.5 g of carbon ball powder and 1.5 g of nickel acetate in 50 mL of deionized water, ultrasonically disperse for 50 min, stir for 1 hour under magnetic stirring conditions, and then dry in an oven at 60 °C. Then, the product obtained by drying was placed in a tube furnace, heated to 500°C at a heating rate of 1°C / min under air conditions, kept for 2 hours and then cooled at room temperature.

[0025] (2) Preparation of nickel oxide-nickel sulfide composite material:

[0026] Take 0.8 g of the nickel oxide double-layer hol...

Embodiment 2

[0032] (1) Preparation of nickel oxide double-layer hollow spheres:

[0033] 10 g of glucose was dissolved in 100 mL of deionized water, placed in a reaction kettle, and hydrothermally reacted at 180° C. for 2 hours. After the reaction was completed, it was cooled at room temperature. The obtained suspension was centrifuged to collect the product, washed three times with deionized water, and dried at 60° C. to obtain carbon sphere powder for later use. Take 1 g of carbon ball powder and 1 g of nickel acetate in 40 mL of deionized water, ultrasonically disperse for 30 min, stir under magnetic stirring for 1 hour, and then place it in an oven to dry at 60 °C. Then, the product obtained by drying was placed in a tube furnace, heated to 400°C at a heating rate of 1°C / min under air conditions, kept for 1 hour and then cooled at room temperature.

[0034] (2) Preparation of nickel oxide-nickel sulfide composite material:

[0035]Take 0.5 g of the nickel oxide double-layer hollow s...

Embodiment 3

[0039] (1) Preparation of nickel oxide double-layer hollow spheres:

[0040] 20 g of glucose was dissolved in 200 mL of deionized water, placed in a reaction kettle, and hydrothermally reacted at 200° C. for 4 hours. After the reaction was completed, it was cooled at room temperature. The obtained suspension was centrifuged to collect the product, washed three times with deionized water, and dried at 60° C. to obtain carbon sphere powder for later use. Take 2g of carbon ball powder and 2g of nickel acetate into 60mL of deionized water, ultrasonically disperse for 60 minutes, stir under magnetic stirring for 2 hours, and then place it in an oven to dry at 80°C. Then, the product obtained by drying was placed in a tube furnace, heated to 600°C at a heating rate of 2°C / min under air conditions, kept for 2 hours and then cooled at room temperature.

[0041] (2) Preparation of nickel oxide-nickel sulfide composite material:

[0042] Take 1 g of the nickel oxide double-layer hollo...

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Abstract

The invention relates to a lithium-sulphur battery cathode material and a preparation method thereof, and in particular relates to a sulphur, nickel oxide and nickel sulphide composite lithium-sulphurbattery cathode material. A preparation process is as follows: a nickel oxide double-layer hollow ball is prepared at first; then, the nickel oxide double-layer hollow ball is partly vulcanized, so that a nickel oxide and nickel sulphide composite is obtained; and then, the material is prepared by sulphur mixing through ball-milling and hot melt methods. The material designed in the invention hasa double-layer hollow ball structure; the relatively high specific capacity is obtained under high current density; the nickel oxide double-layer hollow ball is composed of a nickel oxide nano-sheet;an electron and charge transmission path is shortened; expansion of a material is relieved; furthermore, due to the good mechanical performance, the material has good cycle life; loss of an active substance in a reaction process is reduced in the application process of nickel oxide; a surface oxidation and reduction process is accelerated; and thus, the whole performance of a Li-S battery is improved.

Description

technical field [0001] The technical scheme of the invention relates to a cathode material for lithium-sulfur batteries and a preparation method thereof, in particular to a cathode material of sulfur-nickel oxide-nickel sulfide composite lithium-sulfur batteries and a preparation method thereof, belonging to the field of material chemistry. Background technique [0002] With the continuous improvement of human living standards, the demand for energy in life and production is also increasing rapidly, and traditional fossil resources are not only facing the problem of increasingly depleted sources, but also cause serious environmental pollution problems. Therefore, people urgently need to find a new type of green , safe, low-cost, high-energy-density energy to replace fossil energy. The theoretical specific capacity of the medium-sulfur cathode of the lithium-sulfur battery is as high as 1675 mAh / g, the theoretical specific energy of the lithium-sulfur battery is as high as 26...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 钊妍王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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