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A kind of positive electrode material of lithium-sulfur battery and preparation method thereof

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of low utilization rate of electrode active materials, poor battery cycle performance, poor cycle stability, etc., to achieve enhanced electrochemical performance, improvement of adsorption energy, and enhancement of electrical conductivity

Active Publication Date: 2020-12-11
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

The biggest disadvantage of lithium-sulfur secondary batteries is their poor cycle stability. Studies have shown that lithium polysulfides produced during battery discharge are easily soluble in organic electrolytes. The discharge reaction accelerates the corrosion of lithium, and the generation of disordered lithium polysulfide is a partially irreversible reaction. This series of problems all lead to low utilization of electrode active materials and poor battery cycle performance.

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  • A kind of positive electrode material of lithium-sulfur battery and preparation method thereof
  • A kind of positive electrode material of lithium-sulfur battery and preparation method thereof

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Effect test

Embodiment 1

[0022] The anode material of the lithium-sulfur battery is a composite material formed of nitrogen-doped carbon nanofiber-carbonized covalent organic framework material and pure-phase nano-sulfur powder.

[0023] The mass ratio of the nitrogen-doped carbon nanofiber-carbonized covalent organic framework material to the pure-phase nano-sulfur powder is 1:3.

[0024] The preparation method of the positive electrode material of the lithium-sulfur battery comprises the following steps:

[0025] (1) Preparation of covalent organic framework materials: 0.8g of 1,4-phenylenediamine and 0.8g of 1,3,5-tritylaldehyde were placed in a reaction tube, and 8mL of 1,4-dioxane was added to dissolve the two Mix well, then slowly add 3mL of acetic acid with a mass fraction of 30%, a yellow solid will be produced immediately with the dripping of acetic acid, connect the reaction tube to the vacuum line, vacuumize under the condition of liquid nitrogen freezing, drive out the air bubbles, and sea...

Embodiment 2

[0031] The preparation method of the positive electrode material of the lithium-sulfur battery comprises the following steps:

[0032](1) Preparation of covalent organic framework materials: put 0.5g of 1,4-phenylenediamine and 0.5g of 1,3,5-tritylaldehyde in a reaction tube, add 5mL of 1,4-dioxane to dissolve them Mix well, then slowly add 1mL of acetic acid with a mass fraction of 10%, a yellow solid will be produced immediately with the addition of acetic acid, connect the reaction tube to the vacuum line, vacuumize under the condition of liquid nitrogen freezing, drive out the air bubbles, and seal the tube , naturally rose to room temperature, then transferred to a constant temperature oven at 100°C to react for 24 hours, stopped heating, and after the system was cooled to room temperature, opened the reaction tube, centrifuged, washed, and after Soxhlet extraction, vacuum-dried at 60°C for 12 hours. A light yellow solid was obtained;

[0033] (2) Preparation of nitrogen...

Embodiment 3

[0039] The preparation method of the positive electrode material of the lithium-sulfur battery comprises the following steps:

[0040] (1) Preparation of covalent organic framework materials: put 1g of 1,4-phenylenediamine and 1g of 1,3,5-tritylaldehyde in a reaction tube, add 10mL of 1,4-dioxane to dissolve and mix them well , then drop 5mL of acetic acid with a mass fraction of 40%, a yellow solid will be produced immediately with the drop of acetic acid, connect the reaction tube to the vacuum line, vacuumize under the condition of liquid nitrogen freezing, drive out the air bubbles, seal the tube, and rise naturally to room temperature, then transferred to a constant temperature oven at 150°C to react for 48 hours, stop heating, and after the system was cooled to room temperature, open the reaction tube, centrifuge, wash, and after Soxhlet extraction, vacuum-dry at 60°C for 24 hours to obtain light yellow solid;

[0041] (2) Preparation of nitrogen-doped carbon nanofiber-...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. The material is a composite material formed of nitrogen-doped carbon nanofiber-carbonized covalent organic framework material and pure-phase nano-sulfur powder. Nitrogen-doped carbon nanofiber-carbonized covalent organic framework materials are applied to lithium-sulfur batteries. The resulting positive electrode material improves the cycle performance of lithium-sulfur batteries. Its high specific surface area and porous structure adsorb lithium polysulfide, an intermediate product of the electrode reaction, It plays the role of sulfur fixation; at the same time, the conductivity of the material is also improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are considered to be one of the batteries with the most potential for development in the new century because of their high voltage, high energy density, safety, and reliability. The performance of lithium-ion batteries largely depends on the reversible lithium-extraction / intercalation capacity of the battery material. The cathode material is the bottleneck hindering the development of high-capacity lithium-ion batteries, and the cathode material is also an important factor in determining the safety performance of the battery. The current mainstream cathode materials for lithium-ion secondary batteries include lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate. Although mainstream cathode materials have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCY02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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