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A preparation method of carbon/metal sulfide/carbon three-dimensional porous array composite electrode material for lithium-ion batteries

A metal sulfide and lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of sharp drop in lithium storage capacity, deterioration of cycle performance, and sharp increase in resistance, and achieve high cycle stability and improve battery life. Chemical properties, the effect of enhancing electrical conductivity

Active Publication Date: 2020-10-09
FUZHOU UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As typical representatives of transition metals, although cobalt sulfide and nickel sulfide materials have high theoretical capacity, their electrical conductivity is poor, and in the process of repeated charge and discharge, there is excessive stress that causes electrode pulverization, sharp increase in resistance, and lithium storage capacity. Defects such as sharp decrease and deterioration of cycle performance

Method used

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  • A preparation method of carbon/metal sulfide/carbon three-dimensional porous array composite electrode material for lithium-ion batteries
  • A preparation method of carbon/metal sulfide/carbon three-dimensional porous array composite electrode material for lithium-ion batteries
  • A preparation method of carbon/metal sulfide/carbon three-dimensional porous array composite electrode material for lithium-ion batteries

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Embodiment 1

[0028] A preparation of a carbon / metal sulfide / carbon three-dimensional porous array composite electrode material for lithium ion batteries, specifically comprising the following steps:

[0029] 1) Select clean bamboo, remove the outer skin, select 3g of bamboo phloem and place it in a 80°C deionized water bath for 2 hours to remove impurities, then dry the solid obtained by centrifugation in an oven at 60°C for 12 hours, and then dry the dried The material was placed in a tube furnace and calcined under nitrogen for 2 hours at a temperature of 300°C to obtain a carbonized bamboo material; Figure 1 is a schematic diagram of a carbon-based three-dimensional porous array after carbonization of the bamboo phloem;

[0030] 2) Weigh 1g of the carbonized material, place it in a solution of 30ml of concentrated sulfuric acid and concentrated nitric acid mixed in equal volume, and stir at 70°C for 6h, after it cools down to room temperature, wash it with a large amount of deionized wat...

Embodiment 2

[0035] A preparation of a carbon / metal sulfide / carbon three-dimensional porous array composite electrode material for lithium ion batteries, specifically comprising the following steps:

[0036] 1) Select clean bamboo, remove the outer skin, select 3g of bamboo phloem and place it in a 80°C deionized water bath for 2 hours to remove impurities, then dry the solid obtained by centrifugation in an oven at 60°C for 12 hours, and then dry the dried The material was placed in a tube furnace and calcined under nitrogen for 3 hours at a calcination temperature of 400°C to obtain a carbonized bamboo material; Figure 1 is a schematic diagram of a carbon-based three-dimensional porous array after carbonization of the bamboo phloem;

[0037] 2) Weigh 1g of the carbonized material, place it in a solution of 30ml of concentrated sulfuric acid and concentrated nitric acid mixed in equal volume, and stir at 80°C for 6h, after it cools down to room temperature, rinse it with a large amount of de...

Embodiment 3

[0042] A preparation of a carbon / metal sulfide / carbon three-dimensional porous array composite electrode material for lithium ion batteries, specifically comprising the following steps:

[0043] 1) Select clean bamboo, remove the outer skin, select 3g of bamboo phloem and place it in a 80°C deionized water bath for 2 hours to remove impurities, then dry the solid obtained by centrifugation in an oven at 60°C for 12 hours, and then dry the dried The material was placed in a tube furnace and calcined under nitrogen for 3 hours at a temperature of 500°C to obtain a carbonized bamboo material; Figure 1 is a schematic diagram of a carbon-based three-dimensional porous array after carbonization of the bamboo phloem;

[0044] 2) Weigh 1g of the carbonized material, place it in a solution of 30ml of concentrated sulfuric acid and concentrated nitric acid mixed in equal volume, and stir at 80°C for 6h, after it cools down to room temperature, rinse it with a large amount of deionized wa...

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Abstract

The invention relates to a preparation method of a carbon / metal sulfide / carbon three-dimensional porous array composite electrode material for a lithium-ion battery. The electrode material uses a carbon skeleton, which is obtained after bamboo is calcined, as an array substrate; a metal oxide active substance is loaded by adopting the processes of deorganification, acidification and the like; afterwards, the stability of the material is enhanced through glucose coating and carbonization treatment; subsequently, the oxide is modified to form a sulfide by adopting the processes of suction filtration, oven-drying, ultrasonic treatment and hydrothermal sulfuration to increase electrochemical performance; the carbon / metal sulfide / carbon three-dimensional porous array composite electrode material for the lithium-ion battery is finally obtained. The preparation method is green and environment-friendly, does not use a noble metal or a heavy metal, is convenient and feasible, and is beneficialto industrialized large-scale production, and the prepared electrode material has excellent electric conductivity and stability, high charge and discharge specific capacities and electrochemical cycleperformance, and has huge application potential in the field of negative electrode materials for lithium-ion batteries.

Description

technical field [0001] The invention belongs to the field of new energy nano energy storage materials, and mainly relates to a preparation method of a carbon / metal sulfide / carbon three-dimensional porous array composite electrode material for lithium ion batteries. Background technique [0002] With the rapid development of the economy, people's demand for energy is getting higher and higher. The resulting energy crisis, environmental pollution, greenhouse effect and other worldwide problems are also coming one after another. The developed wind energy, solar energy, geothermal energy, Tidal energy and other inherent defects such as regional intermittency cannot completely solve the endless energy crisis. As a representative of the new energy field, lithium-ion secondary batteries have received more and more attention because of their unrivaled advantages such as high operating voltage, light weight, high energy density, and long service life. Lithium battery anode material,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/362Y02E60/10
Inventor 杨尊先郭太良阮玉帅叶冰清艾经伟胡海龙周雄图陈耿旭李福山张玉飞
Owner FUZHOU UNIV
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