Preparation method of composite positive electrode material for lithium-sulfur battery with nanosheet layered structure

A composite positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, positive electrodes, etc., can solve the problems of difficult commercial production of lithium-sulfur batteries, low conductivity of sulfur positive electrodes, fast capacity decay, etc., to achieve excellent cycle Excellent performance, good cycle stability, and short holding time

Active Publication Date: 2021-06-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, lithium-sulfur batteries have problems such as rapid capacity decay, low conductivity of sulfur cathodes, polysulfide "shuttle effect", lithium ion deposition, and structural changes due to volume changes during charging and discharging, making lithium-sulfur batteries difficult to put into use. large-scale commercial production

Method used

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  • Preparation method of composite positive electrode material for lithium-sulfur battery with nanosheet layered structure
  • Preparation method of composite positive electrode material for lithium-sulfur battery with nanosheet layered structure
  • Preparation method of composite positive electrode material for lithium-sulfur battery with nanosheet layered structure

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Embodiment 1

[0029] A method for preparing a composite cathode material for a lithium-sulfur battery with a nanosheet layered structure, specifically comprising the following steps:

[0030] (1) Add nickel chloride into N,N-dimethylformamide according to the mass volume ratio g:mL of 1:150, stir with a magnetic stirrer combined with ultrasonic dispersion for 30 minutes to obtain a mixed solution A; Diformic acid is added to the mixed solvent according to the ratio of mass volume ratio g:mL of 1:100, and the magnetic stirrer is combined with ultrasonic dispersion for 30 minutes to mix to obtain the mixed solution B. The mixed solvent is N,N-dimethylformamide, ethanol and The water is mixed according to the volume ratio of 5:1:1, the magnetic stirring speed of the magnetic stirrer combined with the ultrasonic treatment is 500 rpm, and the ultrasonic power is 100W;

[0031] (2) Mix the mixed solution A and the mixed solution B in step (1) according to the molar ratio of nickel chloride and te...

Embodiment 2

[0040] A method for preparing a composite cathode material for a lithium-sulfur battery with a nanosheet layered structure, specifically comprising the following steps:

[0041](1) Add nickel chloride into N,N-dimethylformamide according to the mass volume ratio g:mL of 1:180, stir with a magnetic stirrer combined with ultrasonic dispersion for 30 minutes to obtain a mixed solution A; Diformic acid is added into the mixed solvent according to the ratio of mass volume ratio g:mL of 1:120, and the magnetic stirrer is combined with ultrasonic dispersion for 30 minutes to mix to obtain the mixed solution B. The mixed solvent is N,N-dimethylformamide, ethanol and The water is mixed according to the volume ratio of 4:1:1, the magnetic stirring speed of the magnetic stirrer combined with the ultrasonic treatment is 1000 rpm, and the ultrasonic power is 200W;

[0042] (2) Mix the mixed solution A and the mixed solution B in step (1) according to the molar ratio of nickel chloride and ...

Embodiment 3

[0047] A method for preparing a composite cathode material for a lithium-sulfur battery with a nanosheet layered structure, specifically comprising the following steps:

[0048] (1) Add nickel chloride into N,N-dimethylformamide according to the mass volume ratio g:mL of 1:200, stir with a magnetic stirrer combined with ultrasonic dispersion for 30 minutes to obtain a mixed solution A; Diformic acid is added into the mixed solvent according to the ratio of mass volume ratio g:mL of 1:150, and the magnetic stirrer is combined with ultrasonic dispersion for 30 minutes to mix to obtain the mixed solution B. The mixed solvent is N,N-dimethylformamide, ethanol and The water is mixed according to the volume ratio of 3:1:1, the magnetic stirring speed of the magnetic stirrer combined with the ultrasonic treatment is 800 rpm, and the ultrasonic power is 300W;

[0049] (2) Mix the mixed solution A and the mixed solution B in step (1) according to the molar ratio of nickel chloride and ...

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Abstract

The invention discloses a method for preparing a composite cathode material of a lithium-sulfur battery with a nanosheet layered structure. Nickel chloride and terephthalic acid are respectively added to N, N-dimethylformamide solution, and then stirred and combined with a magnetic stirrer. Ultrasonic generator disperses, then adds triethylamine, stirs at room temperature to form a suspension, uses ultrasonic dispersion, centrifuges and heats after drying to obtain black powder, black powder is mixed with sulfur powder and roasted under argon atmosphere, naturally After cooling to room temperature and grinding, the composite positive electrode material of lithium-sulfur battery with nanosheet layered structure is obtained; the layered composite powder prepared by the present invention has small particle size, uniformity, large specific surface area, good sulfur coating, good conductivity, etc. Advantages: The heating rate in the heat treatment process is slow and the holding time is short, ensuring that the particles are uniform and fine, and the sulfur element can fully enter the molecular gap.

Description

technical field [0001] The invention relates to a method for preparing a composite cathode material of a lithium-sulfur battery with a nanosheet layered structure, and belongs to the technical field of lithium-ion batteries. Background technique [0002] Energy is the lifeblood of the development of today's society. The depletion of fossil fuels and serious environmental pollution make the storage and application of new energy an important research hotspot. As an important energy storage system, lithium-ion batteries have attracted much attention in the field of new energy technologies. At present, the development of new energy technologies such as electric vehicles has put forward higher requirements for lithium-ion batteries, among which energy density and power density are aspects that need special attention. The energy density of lithium-ion batteries is mainly determined by the energy density of the electrode materials. [0003] Lithium-sulfur battery is a kind of lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/624H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 张正富徐嘉辉任艳昆范苏晓
Owner KUNMING UNIV OF SCI & TECH
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