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Se@CNT/CP self-supporting flexible electrode material, as well as preparation method and application

A flexible electrode, self-supporting technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve the problem of poor rate performance and cycle stability, dissolution of high-order polyselenides, and limited commercialization development and other issues to achieve efficient charge transport, high yield and industrial feasibility, and improved utilization

Active Publication Date: 2019-04-02
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the relatively poor rate performance and cycle stability of lithium-sulfur batteries limit their commercial development opportunities. Selenium is in the same main group as sulfur in the periodic table, and one selenium atom can accommodate two electrons and provide high capacity. Sulfur (5×10 -28 S / m), Selenium has a higher electronic conductivity (1×10 -3 S / m)
Although the theoretical capacity of selenium (675mAh / g) is lower than that of sulfur (1672mAh / g), the volumetric energy density of selenium (3253mAh / cm 3 ) and sulfur (3467mAh / cm 3 )Almost the same
[0003] However, similar to lithium-sulfur batteries, the main problem faced by lithium-selenide batteries is the dissolution of high-order polyselenides, which leads to rapid capacity fading and low coulombic efficiency.

Method used

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  • Se@CNT/CP self-supporting flexible electrode material, as well as preparation method and application
  • Se@CNT/CP self-supporting flexible electrode material, as well as preparation method and application
  • Se@CNT/CP self-supporting flexible electrode material, as well as preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The first step, the preparation of purified CP:

[0038] Choose Xinxiangyin DT26200 commercial paper towels as the source of carbon paper, soak 4cm×4cm paper towels in 30mL of distilled water, let it stand for 2 hours, then add 4mL of concentrated hydrochloric acid to the above mixture, keep it in its original state for 12 hours to remove Impurities, to obtain purified carbon paper.

[0039] In the second step, SeCl 4 Preparation of / CP composites

[0040] Add the purified carbon paper to the solution containing 0.5g SeCl 4 10mL aqueous solution and let it stand for 30 minutes to ensure that the carbon paper is fully soaked, and then the carbon paper is taken out and freeze-dried for 12 hours to obtain the loaded SeCl 4 CP of SeCl 4 / CP composites.

[0041] Step 3: Preparation of Se@CNT / CP self-supporting flexible electrode material:

[0042] A piece of SeCl 4 The / CP is placed in a porcelain boat and placed horizontally in the middle of the tube furnace. In acc...

Embodiment 2

[0047] The first step, the preparation of purified CP:

[0048] Choose Xinxiangyin DT26200 commercial paper towels as the source of carbon paper, soak 4cm×4cm paper towels in 30mL of distilled water, let it stand for 4 hours, then add 8mL of concentrated hydrochloric acid to the above mixture, keep it in its original state for 24 hours to remove Impurities, to obtain purified carbon paper.

[0049] In the second step, SeCl 4 Preparation of / CP composites

[0050] Add the purified carbon paper to the solution containing 0.7g SeCl 4 10mL aqueous solution and let it stand for 30 minutes to ensure that the carbon paper is fully soaked, and then the carbon paper is taken out and freeze-dried for 12-24h to obtain the loaded SeCl 4 CP of SeCl 4 / CP composites.

[0051] Step 3: Preparation of Se@CNT / CP self-supporting flexible electrode material:

[0052] A piece of SeCl 4 The / CP is placed in a porcelain boat and placed horizontally in the middle of the tube furnace. In acces...

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Abstract

The invention belongs to the technical field of lithium-selenium battery positive electrode materials, relates to a self-supporting flexible electrode material composed of an active material, in particular to a Se@CNT / CP self-supporting flexible electrode material, as well as a preparation method and an application, and refers to a preparation process of the Se@CNT / CP self-supporting flexible electrode material with a shell-sheath structure through a novel simple immersion type chemical vapor deposition technology, and a preparation method of the Se@CNT / CP self-supporting flexible electrode material with the characteristics of high yield, industrial feasibility and the like. The adopted immersion type chemical vapor deposition technology is easy and effective, and large-scale and low-costindustrialization of the Se@CNT / CP self-supporting flexible electrode material can be realized easily.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium-selenium batteries, and relates to self-supporting flexible electrode materials composed of active materials, specifically Se@CNT / CP self-supporting flexible electrode materials, preparation methods and applications. Background technique [0002] Lithium-ion batteries are widely used in today's life due to their high efficiency, cleanliness, reusability and many other advantages, such as mobile phones, notebooks and other electronic devices. However, with the requirements of power vehicles and large-scale energy storage systems, the energy density and cycle life of traditional lithium-ion batteries can no longer meet the above application requirements. Exploring materials with higher capacity and energy density has become an important task, and lithium-sulfur batteries are regarded as the most promising next-generation systems due to their high capacity (1672mAh / g)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/366H01M4/38H01M4/625H01M4/628H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 张永光崔国梁
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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