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Phosphorus-doped porous carbon material, preparation method thereof and application of phosphorus-doped porous carbon material in coating diaphragm for lithium-sulfur battery

A porous carbon material and lithium-sulfur battery technology, applied in the field of electrochemistry, can solve the problems that hinder the application of rechargeable Li-S batteries, reduce the Coulombic efficiency, and cell self-discharge, and achieve the suppression of shuttle effect, suppression of self-discharge, and simple operation Effect

Active Publication Date: 2019-05-03
JIANGSU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the "shuttle effect" is one of the key issues hindering the practical application of rechargeable Li-S batteries
The shuttling effect originates from the diffusion of polysulfides between the anode and cathode, resulting in capacity loss, decreased Coulombic efficiency and severe self-discharge of the cell

Method used

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  • Phosphorus-doped porous carbon material, preparation method thereof and application of phosphorus-doped porous carbon material in coating diaphragm for lithium-sulfur battery
  • Phosphorus-doped porous carbon material, preparation method thereof and application of phosphorus-doped porous carbon material in coating diaphragm for lithium-sulfur battery
  • Phosphorus-doped porous carbon material, preparation method thereof and application of phosphorus-doped porous carbon material in coating diaphragm for lithium-sulfur battery

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Effect test

Embodiment 1

[0034] Preparation of β-carbonyl cyclodextrin binder: First, dissolve 2.0 g of β-cyclodextrin in 5 mL of H 2 o 2 The solution was kept at 80° C. for 24 hours to remove the solvent, and then transferred to a vacuum drying oven at 80° C. for 24 hours to obtain the β-carbonyl cyclodextrin binder.

[0035] Preparation of coated separators for lithium-sulfur batteries: first dehydrate 0.15M sucrose solution in a hydrothermal kettle at 190°C, and then further carbonize in argon in a tube furnace at 900°C. For a 500mg carbon sample, add 650μL of 2.0M Co(NO 3 ) 2 ·6H 2 The solution of O was dried overnight at 100 °C to obtain Co-C. Then add phytic acid, phytic acid: the mass ratio of carbon sample=5:1, after drying at 85 ℃, put the sample in N 2 Under the atmosphere, the rate was increased to 800°C at a rate of 3°C / min and kept for 1 hour, then 1.0M HCl solution was used for 12 hours to dissolve the residual Co salt, and finally dried at 80°C to obtain a phosphorus-doped porous c...

Embodiment 2

[0040] Preparation of β-carbonyl cyclodextrin binder: First, dissolve 2.0 g of β-cyclodextrin in 5 mL of H 2 o 2 The solution was kept at 80° C. for 24 hours to remove the solvent, and then transferred to a vacuum drying oven at 80° C. for 24 hours to obtain the β-carbonyl cyclodextrin binder.

[0041] Preparation of coated separators for lithium-sulfur batteries: First, dehydrate 0.15M sucrose solution in a hydrothermal kettle at 190°C, and then further carbonize in argon in a tube furnace at 1000°C. For a 500mg carbon sample, add 650μL of 2.0M Co(NO 3 ) 2 ·6H 2 O solution, dried overnight at 100°C. Then add phytic acid, phytic acid: the mass ratio of carbon sample=3:1, after drying at 85 ℃, put the sample in N 2 Under the atmosphere, the rate was raised to 800°C at a rate of 3°C / min for calcination and pyrolysis and kept for 1 hour, then 1.0M HCl solution was used for 12h to dissolve the residual Co salt, and finally dried at 80°C to obtain a phosphorus-doped porous car...

Embodiment 3

[0044] Preparation of β-carbonyl cyclodextrin binder: First, dissolve 2.0 g of β-cyclodextrin in 5 mL of H 2 o 2 The solution was kept at 80° C. for 24 hours to remove the solvent, and then transferred to a vacuum drying oven at 80° C. for 24 hours to obtain the β-carbonyl cyclodextrin binder.

[0045] Preparation of coated separators for lithium-sulfur batteries: first dehydrate 0.15M sucrose solution in a hydrothermal kettle at 190°C, and then further carbonize in argon in a tube furnace at 900°C. For a 500mg carbon sample, add 650μL of 2.0M Co(NO 3 ) 2 ·6H 2 O solution, dried overnight at 100°C. Then add phytic acid, phytic acid: carbon sample = 7: 1 mass ratio, dry the sample at 85°C 2 Under the atmosphere, the rate was increased to 800°C at a rate of 3°C / min and kept for 1 hour, then 1.0M HCl solution was used for 12 hours to dissolve the residual Co salt, and finally dried at 80°C to obtain a phosphorus-doped porous carbon material, the specific surface area 278m ...

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Abstract

The invention discloses a phosphorus-doped porous carbon material, a preparation method thereof and an application of the phosphorus-doped porous carbon material in a coating diaphragm for a lithium-sulfur battery. The diaphragm is formed by modifying a coating which coats a diaphragm base body. A preparation method of the diaphragm comprises the following steps: preparing the phosphorus-doped porous carbon material by taking phytic acid as a phosphorus source and cobalt nitrate as a template, uniformly mixing the phosphorus-doped porous carbon materials with different phosphorus content witha conductive agent and a water-phase adhesive, dropwise adding a proper amount of deionized water to obtain uniformly-dispersed coating slurry, uniformly coating a conventional polyolefin diaphragm matrix with the coating slurry, and carrying out drying to obtain the coating diaphragm. The improved coating diaphragm has strong chemical adsorption on polysulfides formed in charging and dischargingprocesses, the "shuttle effect" is effectively inhibited, and electrochemical performance of the lithium-sulfur battery is improved.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a phosphorus-doped porous carbon material and its preparation and application in a coating separator for a lithium-sulfur battery. Background technique [0002] Energy storage devices are increasingly important for applications in mobile electronics and hybrid vehicles, and also play an important role in renewable energy harvesting, conversion, and energy storage. Lithium-ion batteries are the mainstream energy storage technology for mobile power supplies today, but the total capacity of lithium-ion batteries is limited by the LiCoO 2 (272mAh / g) and LiFePO 4 (170mAh / g) and other positive electrode materials are limited by the theoretical capacity, which cannot meet the increasing consumer demand. Lithium-sulfur (Li-S) batteries have gained widespread popularity due to their high theoretical energy density (∼2600 Wh / kg), low cost, and naturally abundant sulfur active elements. T...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01M2/14H01M2/16H01M10/052H01M50/403H01M50/431H01M50/489
CPCY02E60/10
Inventor 张开龙潘红琳王莉王迪江钰蒋政言王磊王良彪周全法
Owner JIANGSU UNIVERSITY OF TECHNOLOGY
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