Novel high-performance lithium-sulfur battery positive electrode material and preparation method thereof

A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of volume expansion effect and poor cycle characteristics, and achieve excellent electrochemical energy storage advantages , Improve the charge transfer rate, easy to achieve the effect

Active Publication Date: 2020-06-26
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In principle, two-dimensional graphene sheets of carbon-based materials are a promising sulfur-loading host. After sulfur is loaded onto graphene, it can effectively improve the conductivity of the positive electrode structure; The confinement ability of LPS) is very effective, leading to its poor cycle characteristics; in addition, the two-dimensional structure of graphene has little effect on the volume expansion effect during the discharge process.

Method used

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  • Novel high-performance lithium-sulfur battery positive electrode material and preparation method thereof
  • Novel high-performance lithium-sulfur battery positive electrode material and preparation method thereof
  • Novel high-performance lithium-sulfur battery positive electrode material and preparation method thereof

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Embodiment 1

[0030] The novel high-performance lithium-sulfur battery cathode material is graphene and V with a three-dimensional foam structure. 2 Composites of C Mxene.

[0031] The preparation method of the novel high-performance lithium-sulfur battery cathode material comprises the following steps:

[0032] (1) Prepare graphene and V 2 C Mxene aqueous phase dispersion mixture: first weigh 5mL graphene homogeneous aqueous phase dispersion liquid with a concentration of 10mg / mL, then add 7.5mL deionized water to dilute it to 4mg / mL, and stir evenly in a beaker at room temperature for 0.5 h obtains graphene homogeneous dispersion liquid, then according to mass ratio graphene: V 2 C Mxene is 10:1 ratio will 1mL concentration be 5mg / ml V 2C Mxene solution is added in graphene homogeneous dispersion liquid, continuously stirs 0.5h to form uniform graphene and V 2 C Mxene aqueous phase dispersion mixture;

[0033] (2) Preparation of adsorbed graphene and V 2 C Mxene's nickel foam: First...

Embodiment 2

[0041] The preparation method of the novel high-performance lithium-sulfur battery cathode material comprises the following steps:

[0042] (1) Prepare graphene and V 2 C Mxene aqueous phase dispersion mixture: first weigh 2.5mL graphene homogeneous aqueous phase dispersion liquid with a concentration of 10mg / mL, then add 3.75mL deionized water to dilute it to 4mg / mL, and stir evenly in a beaker at room temperature 0.5h obtains graphene homogeneous dispersion liquid, then according to mass ratio graphene: V 2 C Mxene is 5:1 ratio will 1mL concentration be 5mg / ml V 2 C Mxene solution is added in graphene homogeneous dispersion liquid, continuously stirs 0.5h to form uniform graphene and V 2 C Mxene aqueous phase dispersion mixture;

[0043] (2) Preparation of adsorbed graphene and V 2 C Mxene's nickel foam: First, the nickel foam is sequentially washed with deionized water and absolute ethanol

[0044] Wash each once and dry at 60°C for 1h, then soak until the graphene and...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a novel high-performance lithium-sulfur battery positive electrode material and a preparation method thereof. The positive electrode material is a composite material of graphene with a three-dimensional foam structure and V2C Mxene. The positive electrode material is a graphene and V2C Mxene composite material with a three-dimensional foam structure, and graphene has good conductivity; the V2C Mxene has the characteristics of excellent adsorbability and electrochemical energy storage; meanwhile, the three-dimensional foam structure limits soluble polysulfide, increases active sites and forms a rapid ion channel, and the electrochemical performance of the lithium-sulfur battery is promotedthrough the combined action of the three components. The preparation method is simple, effective and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a novel high-performance lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] With the increasing progress of society and the rapid development of science and technology, the demand for energy storage technology in human society continues to grow, making rechargeable batteries emerge as the times require, in order to cope with the energy crisis faced by social development. Due to the abundant content of sulfur in the earth's crust, its low price and its excellent theoretical specific capacity, lithium-sulfur batteries have become one of the most promising new secondary batteries and have received widespread attention. [0003] However, the field of lithium-sulfur batteries still faces major challenges. There are many shortcomings such as poor conductivity of the active material sulfur in the battery; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/052C01B32/182
CPCH01M4/362H01M4/583H01M4/625H01M10/052C01B32/182Y02E60/10
Inventor 张永光刘加兵
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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