Preparation method of hydrophilic modification hollow carbon for lithium electrode and sulfur electrode material

A hydrophilic modification, lithium electrode technology, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problem that dendrites and polysulfide shuttle cannot be effectively inhibited, so as to inhibit the shuttle of polysulfide ions and avoid The effect of dendrites, specific surface area and large pore volume

Inactive Publication Date: 2019-08-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that traditional porous carbon cannot effectively inhibit the shuttle of dendrites and polysulfides, the present invention proposes to improve the hydrophilicity of carbon materials

Method used

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  • Preparation method of hydrophilic modification hollow carbon for lithium electrode and sulfur electrode material
  • Preparation method of hydrophilic modification hollow carbon for lithium electrode and sulfur electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment one: melamine / H 2 SO 4 Solution preparation

[0036] Add 5.04g (0.04mol) of melamine into deionized water (180mL, 10mol) and stir to dissolve at 80°C, then slowly add 5mL of 6N concentrated sulfuric acid H 2 SO 4 , mixed uniformly and stirred for 2h at 80°C to obtain acidified melamine (melamine / H 2 SO 4 ) solution.

Embodiment 2

[0037] Embodiment two: preparation of cobalt coordination melamine solution

[0038] Dissolve hexahydrate cobalt nitrate (5.82g, 0.02mol) in deionized water (58.2mL) 10 times its mass to obtain a transition metal solution, and slowly add it to the melamine / H solution obtained in Example 1 2 SO 4 The solution made the molar ratio of cobalt nitrate and melamine reach 1:2, and stirred for 2 hours to obtain a cobalt-coordinated melamine solution.

Embodiment 3

[0039] Embodiment three: mixed solution spray flash freezing

[0040] Nickel nitrate hexahydrate (5.81g, 0.02mol) was dissolved in deionized water (58.1mL) 10 times its mass to obtain a transition metal solution, which was slowly added to the melamine / H solution obtained in Example 1. 2 SO 4 The solution made the molar ratio of cobalt nitrate and melamine reach 1:2, and stirred for 2 hours to obtain a nickel-coordinated melamine solution.

[0041] Take 7.93g (0.04mol) of glucose monohydrate, 0.3g (5.3mmol) of KOH, and 0.1g (2.7mmol) of NaOH, add 8.33mL of deionized water, stir well at 80°C, the moles of KOH and NaOH in the solution The ratio is 1:0.5, glucose and alkali (OH - ) in a molar ratio of 1:0.2, slowly add the above nickel-coordinated melamine solution, and the molar ratio of melamine to glucose is 1:1. Spray the above solution directly into a Dewar bottle filled with liquid nitrogen through a sprayer for flash freezing, and directly quench from 80° C. to the tempe...

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Abstract

The invention relates to a lithium-sulfur battery technology, and aims to provide a preparation method of hydrophilic modification hollow carbon for a lithium electrode and sulfur electrode material.According to the preparation method, KOH-NaOH mixed alkali is used as a template, a transition metal ligand solution is obtained by employing transition metal nitrate and melamine ligand, a precursoris obtained by flash freezing of a coordination compound, glucose and the mixed alkali solution, an intermediate product comprising transition metal coordination graphite carbon nitride is obtained byfreezing, drying and medium-temperature calcination, the hydrophilic modification hollow carbon loaded with a transition metal oxide is obtained by high-temperature calcination, reaction of diluted hydrochloric acid and cleaning, filtering and drying of deionized water and is used for loading metal lithium and sulfur as an electrode material of a lithium-sulfur battery. Hollow carbon with hydrophilic inner surface and outer surface is obtained and has the characteristics of large specific area and large pore volume, and more lithium or sulfur can be loaded; formation of metal lithium ion holeduring charging is guaranteed by the transition metal oxide dispersed and distributed on an inner wall of carbon, and dendritic crystal of the metal lithium is prevented.

Description

technical field [0001] The invention relates to lithium-sulfur battery technology, in particular to a preparation method of hydrophilic modified hollow carbon used for lithium electrodes and sulfur electrode materials. Background technique [0002] Lithium-sulfur batteries use elemental sulfur and metallic lithium as positive and negative active materials, and realize the mutual conversion of electrical energy and chemical energy through the chemical reaction of lithium and sulfur. The mass energy density of the assembled battery can reach 2500Wh kg -1 , far larger than the lithium-ion batteries currently in use, which means that lithium-sulfur batteries of the same quality can provide greater energy, make up for the shortcomings of lithium-ion batteries with low energy density, and provide a basis for improving the mileage and driving performance of electric vehicles . Compared with the positive electrode material of lithium-ion batteries, elemental sulfur, an important ra...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/052
CPCH01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 李洲鹏汪述平刘宾虹
Owner ZHEJIANG UNIV
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