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Nitrogen-rich eggshell type lithium sulfur battery anode material and preparation method and application thereof

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as fragmentation, density difference, volume expansion of sulfur cathode, and achieve regular shape, effective adsorption, and control simple effect

Inactive Publication Date: 2016-03-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition to the dissolution of polysulfides and the shuttle effect, another problem that needs to be solved is the elemental S and the discharge product Li 2 Due to the different density of S, the sulfur cathode will expand in volume (about 79%) during charge and discharge, leading to serious safety problems such as fragmentation.

Method used

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  • Nitrogen-rich eggshell type lithium sulfur battery anode material and preparation method and application thereof
  • Nitrogen-rich eggshell type lithium sulfur battery anode material and preparation method and application thereof
  • Nitrogen-rich eggshell type lithium sulfur battery anode material and preparation method and application thereof

Examples

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Effect test

Embodiment example 1

[0044] Put 2.0g of melamine, 3.6mL of formaldehyde and 20mL of deionized water in a 100mL three-neck flask, stir and mix evenly, then add triethanolamine, control the pH value to 8, heat the water bath to 75°C and continue stirring for 20min to obtain the reaction product A; Add 32mL of silica sol and 100mL of deionized water into a 250mL three-neck flask, stir well, and ultrasonically treat for 1 hour, then add the reaction product A, adjust the pH to 6 with acetic acid, heat in a water bath, slowly raise the temperature to 60°C, and keep stirring 2h, cooling. Filter, wash, and dry to obtain the core-shell structure B of melamine-formaldehyde resin-coated silica. Set B at 3°C ​​min -1 Carbonization was carried out at 800°C for 3h in a high-purity nitrogen atmosphere at the heating rate. Then the carbonized product was etched with 5M NaOH solution at 100°C for 8h, washed with deionized water until the pH value remained unchanged, filtered, and dried at 80°C for 24h to obtain...

Embodiment example 2

[0053] Put 2.0g of melamine, 4.8mL of formaldehyde and 20mL of deionized water in a 100mL three-neck flask, stir and mix evenly, then add triethanolamine, control the pH value to 9, heat the water bath to 75°C and continue stirring for 20min to obtain the reaction product A; Add 40mL of silica sol and 100mL of deionized water into a 250mL three-necked flask, stir well, and ultrasonically treat for 1 hour, then add the reaction product A, adjust the pH to 6 with acetic acid, heat in a water bath, slowly raise the temperature to 60°C, and keep stirring 2h, cooling. Filter, wash, and dry to obtain the core-shell structure B of melamine-formaldehyde resin-coated silica. The dried melamine-formaldehyde resin-coated silica core-shell structure B was carbonized at 800°C under a high-purity nitrogen atmosphere for 3 hours at a heating rate of 3°C min-1. Then the carbonized product was etched with 5M NaOH solution at 100°C for 8h, washed with deionized water until the pH value remaine...

Embodiment example 3

[0062]Put 2.0g of melamine, 6mL of formaldehyde and 20mL of deionized water in a 100mL three-necked flask, stir and mix evenly, add triethanolamine, control the pH value to 9, heat the water bath to 75°C and continue stirring for 20min to obtain the reaction product A; Add 40mL of silica sol and 100mL of deionized water into a 250mL three-neck flask, stir well, and ultrasonically treat for 1 hour, then add the reaction product A, adjust the pH to 6 with chromic acid, heat in a water bath, slowly raise the temperature to 60°C, and keep it warm Stir for 2h and cool. Filter, wash, and dry to obtain the core-shell structure B of melamine-formaldehyde resin-coated silica. Dry the core-shell structure B of melamine-formaldehyde resin-coated silica at 3°C ​​min -1 Carbonization was carried out at 800°C for 3h in a high-purity nitrogen atmosphere at the heating rate. Then the carbonized product was etched with 5M NaOH solution at 100°C for 8h, washed with deionized water until the p...

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Abstract

The invention discloses a lithium sulfur battery anode material and preparation method thereof, melamine formaldehyde resin rich in nitrogen is taken as a carbon source and nitrogen source, a nitrogen-rich hollow eggshell with the diameter of 100-300 nm is prepared with a nanometer SiO2 casting method, the interfacial adsorption of polysulfide is enhanced by the aid of the combined effect of physical adsorption and chemical adsorption, migration and shuttle effects of the polysulfide are effectively restrained, and charge and discharge stability of a lithium sulfur battery is enhanced. At the same time, an eggshell structure is formed after the hollow eggshell is filled with sulfur, and an interior gap exists between a sulfur inner core and a polymer shell so as to accommodate volume expansion in a sulfur atom lithiation process. The lithium sulfur battery anode material is applied to preparation of a lithium sulfur battery anode and the lithium sulfur battery. The lithium sulfur battery has excellent cycle performance and capacity retention ratio.

Description

technical field [0001] The invention belongs to the field of electrode materials, and relates to a lithium-sulfur battery cathode material, a lithium-sulfur battery cathode, a lithium-sulfur battery and a preparation method thereof. Background technique [0002] Secondary batteries have been widely used because of their economical and practical characteristics, especially lithium-ion batteries have the advantages of light weight, high capacity and no memory effect. However, lithium-ion batteries are limited by the theoretical capacity of traditional cathode materials, and their energy density is low, which can no longer meet our increasingly high requirements. Therefore, people began to study some new lithium secondary battery systems, among which lithium-sulfur batteries have become a research hotspot. [0003] The advantages of lithium-sulfur batteries are: (1) Elemental sulfur is abundant in nature; (2) Environmentally friendly; (3) The theoretical specific capacity of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/583H01M4/139H01M10/052
CPCH01M4/139H01M4/5815H01M4/583H01M10/052Y02E60/10
Inventor 张凤祥张小龙杜新宇李令东盖方圆
Owner DALIAN UNIV OF TECH
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