Preparation method of lithium-sulfur battery current collector

A lithium-sulfur battery and current collector technology, which is applied in the field of preparation of three-dimensional self-supporting lithium-sulfur battery current collectors, can solve the problems of low utilization rate of active materials, fast capacity decay, poor rate performance, etc., and achieve high reproducibility and high load capacity. The effect of high volume and long cycle life

Active Publication Date: 2021-03-02
KUNMING UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003]Lithium-sulfur batteries have great advantages in terms of energy density, raw material cost, and environmental compatibility, but they are limited to the reaction mechanism and material characteristics of electrode materials, and there are active materials utilization Low efficiency, fast capacity decay, low Coulombic efficiency, poor rate performance, etc.

Method used

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  • Preparation method of lithium-sulfur battery current collector

Examples

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Embodiment 1

[0026] A preparation method of a lithium-sulfur battery current collector, the specific steps are as follows:

[0027] (1) Cleaned biomass cattails are evenly spread between two graphite sheets (30mm*50mm), the biomass mass is 650mg, and pre-carbonized in a muffle furnace at 240°C for 2h in an air atmosphere. The carbonized sample was carbonized at 850 °C for 2 h in an Ar atmosphere, and after cooling to 700 °C, CO 2 Activation under the atmosphere for 2h, to obtain a three-dimensional self-supporting carbon material with the same quality as the conventional current collector aluminum foil; as figure 1 Shown is the topography of the prepared three-dimensional self-supporting carbon material. It can be seen from the figure that the prepared material is a flexible three-dimensional self-supporting carbon material;

[0028] (2) Disperse nickel sulfide in ethanol / water (volume ratio 1:1) solvent according to the mass volume ratio g:mL of 1:5 to obtain a uniform slurry, and vulcan...

Embodiment 2

[0032] A preparation method of a lithium-sulfur battery current collector, the specific steps are as follows:

[0033] (1) The cleaned biomass bamboo fiber is evenly spread between two graphite sheets (30mm*50mm), and the biomass quality is 500mg. In the muffle furnace, under the air atmosphere, pre-carbonize at 100°C for 2h, the The pre-carbonized samples were carbonized at 500 °C for 3 h under Ar atmosphere, and then in CO 2 Activation at 500°C for 3 hours in the atmosphere to obtain a flexible three-dimensional self-supporting carbon material with the same quality as the conventional current collector aluminum foil;

[0034] (2) Disperse nano-titanium dioxide in ethanol / water (volume ratio 1:1) solvent in a ratio of 1:5 according to the mass volume ratio g:mL to obtain a uniform slurry, and obtain a uniform slurry according to the final material titanium dioxide 5% by mass is coated on the flexible three-dimensional self-supporting carbon material obtained in step (1) to o...

Embodiment 3

[0038] A preparation method of a lithium-sulfur battery current collector, the specific steps are as follows:

[0039] (1) Cleaned biomass cattail and bamboo fiber mass ratio 1:1 are evenly spread between two graphite sheets (30mm*50mm), the biomass mass is 750mg, in the muffle furnace, under the air atmosphere, with Pre-carbonize at 300°C for 1 h, carbonize the pre-carbonized sample at 900°C for 1 h in an Ar atmosphere, and then carbonize at 900°C in CO 2 Activated under the atmosphere for 1h to obtain a flexible three-dimensional self-supporting carbon material with the same quality as the conventional current collector aluminum foil;

[0040] (2) The commercial Mxene (Ti 3 C 2 ) is dispersed in ethanol / water (volume ratio 1:1) solvent to obtain uniform slurry according to the ratio of mass volume ratio g:mL being 1:5, and the homogeneous slurry obtained is coated with 20% of the mass content of the final material Mxene Coated on the flexible three-dimensional self-suppor...

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Abstract

The invention discloses a preparation method of a lithium-sulfur battery current collector. The preparation method comprises the following steps of: preparing a slurry from a transition metal sulfideor Ti-based material, and coating a three-dimensional self-supporting carbon material with the slurry to obtain a three-dimensional self-supporting lithium-sulfur battery current collector. The transition metal sulfide or Ti-based material loaded three-dimensional self-supporting current collector for a lithium-sulfur battery prepared by the method is simple in preparation method, available in material, high in reproducibility, high in flexibility and controllable in quality of the current collector, high sulfur loading capacity can be realized, and industrial popularization and application are easy to realize.

Description

technical field [0001] The invention relates to the technical field of battery materials, and more specifically, to a method for preparing a three-dimensional self-supporting lithium-sulfur battery current collector. Background technique [0002] Lithium-sulfur battery technology is based on the redox reaction mechanism, elemental sulfur is used as the positive electrode material, and the theoretical capacity is as high as 1675mAhg -1 , which is 5-10 times that of the current commercial positive electrode material, and the battery is assembled with metal lithium negative electrode, and the theoretical mass energy density is as high as 2500Whkg -1 , volumetric energy density up to 2800WhL -1 , which can fully meet the standards of electric vehicle power batteries, and has abundant elemental sulfur reserves, low cost, environmental friendliness, safety and reliability. Lithium-sulfur battery is a promising next-generation battery energy storage system, which has great resear...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/052
CPCH01M4/667H01M4/663H01M10/052Y02E60/10
Inventor 张义永夏广辉王丁张英杰李雪豹侯冀岳王颖
Owner KUNMING UNIV OF SCI & TECH
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