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Composite positive electrode material with spring-shaped lamellar structure as well as preparation method and application of composite positive electrode material

A technology of composite cathode material and lamellar structure, applied in structural parts, battery electrodes, electrical components, etc., can solve the problems of low Coulombic efficiency, low discharge voltage, short cycle life, etc., and achieve shortened diffusion distance, strong structural rigidity, The effect of promoting penetration

Pending Publication Date: 2022-02-15
中科南京绿色制造产业创新研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these cathode materials have some problems, such as low specific capacity of graphite-based cathode materials, poor rate capacity and cycle stability of metal sulfides, and slow reaction kinetics / polysulfide dissolution of sulfur cathode materials. Ion batteries urgently need to develop cathode materials with high capacity, high rate performance and long cycle life
In order to solve the above problems, metal oxide nanomaterials have been developed rapidly. Researchers use nanomaterials to improve the specific capacity and cycle stability of batteries, but there are still problems that have not been resolved. For example, the positive electrode active material cannot fully contact the electrolyte, and there is no stability The capacitive behavior of the discharge platform, lower discharge voltage, poor reversibility and low Coulombic efficiency, thus causing rapid discharge specific capacity decay and short cycle life, while there is a positive electrode due to the larger size of the intercalation product Problems with material structure decomposition and volume expansion

Method used

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  • Composite positive electrode material with spring-shaped lamellar structure as well as preparation method and application of composite positive electrode material
  • Composite positive electrode material with spring-shaped lamellar structure as well as preparation method and application of composite positive electrode material
  • Composite positive electrode material with spring-shaped lamellar structure as well as preparation method and application of composite positive electrode material

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Embodiment 1

[0062] This embodiment provides a composite positive electrode material with a spring-like sheet structure, and the composite positive electrode material includes a carbon sheet and vanadium trioxide nanoparticles dispersed on the surface of the carbon sheet. The single-layer thickness of the composite positive electrode material is 35nm, and the single-layer width is 500nm.

[0063] The preparation method of the composite cathode material is as follows:

[0064] Vanadium dioxide (0.1866g) and 1,4-naphthalene dicarboxylic acid (0.3243g) with a molar ratio of 1.5:1 were stirred in 30mL of deionized water at a stirring rate of 700rpm for 4h. Precursor material was obtained after thermal reaction for 22 hours, washed by centrifugation with deionized water for 5 times, and then washed with ethanol twice for 5 minutes, and then dried at 60°C for 10 hours. Calcining at 750° C. for 5 hours in an argon atmosphere at a heating rate, and cooling to room temperature to obtain the compos...

Embodiment 2

[0066] This embodiment provides a composite positive electrode material with a spring-like sheet structure, and the composite positive electrode material includes a carbon sheet and vanadium trioxide nanoparticles dispersed on the surface of the carbon sheet. The single-layer thickness of the composite positive electrode material is 20nm, and the single-layer width is 200nm.

[0067] The preparation method of the composite cathode material is as follows:

[0068] Vanadium dioxide (0.1244g) and 1,4-naphthalene dicarboxylic acid (0.3243g) with a molar ratio of 1:1 were stirred in 30mL of deionized water at a stirring rate of 600rpm for 6h. Precursor material was obtained after thermal reaction for 24 hours, centrifuged and washed with deionized water for 4 times, and then washed with ethanol once for 1 minute, and then dried at 40°C for 12 hours. Calcining at 700° C. for 6 hours in an argon atmosphere at a heating rate, and cooling to room temperature to obtain the composite po...

Embodiment 3

[0070] This embodiment provides a composite positive electrode material with a spring-like sheet structure, and the composite positive electrode material includes a carbon sheet and vanadium trioxide nanoparticles dispersed on the surface of the carbon sheet. The thickness of a single layer of the composite positive electrode material is 50 nm, and the width of a single layer is 800 nm.

[0071] The preparation method of the composite cathode material is as follows:

[0072] Vanadium dioxide (0.2488g) and 1,4-naphthalene dicarboxylic acid (0.3243g) with a molar ratio of 2:1 were stirred in 30mL of deionized water at a stirring rate of 800rpm for 2h. Precursor material was obtained after thermal reaction for 20 hours, washed by centrifugation with deionized water for 6 times, and then washed with ethanol twice for 5 minutes, and then dried at 80°C for 8 hours. Calcining at 800° C. for 4 hours in an argon atmosphere at a heating rate, and cooling to room temperature to obtain t...

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Abstract

The invention provides a composite positive electrode material with a spring-shaped lamellar structure as well as a preparation method and application of the composite positive electrode material. The composite positive electrode material comprises a carbon sheet layer and vanadium trioxide nanoparticles dispersed on the surface of the carbon sheet layer. The invention provides an aluminum ion battery composite positive electrode material with a spring-shaped lamellar structure. The composite positive electrode material adopts a carbon sheet layer as a support skeleton, and is compounded with vanadium trioxide nanoparticles, so the diffusion path of aluminum ions is reduced, and the conductivity of the composite positive electrode material is enhanced; meanwhile, a precursor material is prepared by utilizing a hydrothermal method, and is calcined at high temperature to finally obtain the composite material with the spring-shaped lamellar structure.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a composite positive electrode material with a spring-like sheet structure, a preparation method thereof and an application of an aluminum ion battery. Background technique [0002] The energy crisis and environmental problems caused by the depletion of fossil fuels have greatly accelerated the development of renewable energy and energy storage devices. At present, lithium-ion batteries have been widely used in portable electronic devices, including mobile phones, notebook computers and wearable devices. Lithium-ion batteries are also considered to be the preferred large-scale energy storage systems for the growing demand of smart grids and electric vehicles. Aluminum is the most abundant metal element in the earth's crust, and aluminum ions have a smaller radius than lithium ions, which indicates that aluminum ions can intercalate and deintercalate in the intercalation stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/054
CPCH01M4/362H01M4/583H01M4/48H01M10/054Y02E60/10
Inventor 韩阗俐王艳胡超权李琳刘金云
Owner 中科南京绿色制造产业创新研究院
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