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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 low electrochemical performance, battery specific capacity, low cycle retention rate, etc., to achieve high cycle retention rate, Effect of inhibiting polysulfide ion shuttle and reducing cost

Active Publication Date: 2019-03-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems in the prior art that the shuttle effect of lithium polysulfide, the intermediate product of the sulfur positive electrode in the lithium-sulfur battery, leads to low battery specific capacity, cycle retention rate, and low overall electrochemical performance, one of the purposes of the present invention is to provide a A cathode material for lithium-sulfur batteries

Method used

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  • Lithium-sulfur battery positive electrode material and preparation method thereof
  • Lithium-sulfur battery positive electrode material and preparation method thereof
  • Lithium-sulfur battery positive electrode material and preparation method thereof

Examples

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Embodiment 1

[0043] The lithium-sulfur battery cathode material includes a matrix layer, a polymer layer covering the matrix layer, and a core layer located in the matrix layer. like figure 1 As shown, 1 is the base layer, 2 is the polymer layer, and 3 is the core layer.

[0044] The matrix layer is halloysite, the polymer is one of polypyrrole (PPy), polyaniline (PANI) and poly-3,4-ethylenedioxythiophene (PEDOT), and the core layer is a sulfur elemental layer.

[0045] figure 2 It is a scanning electron microscope (SEM) picture of untreated halloysite. From the picture, it can be seen that halloysite has smooth outer walls and hollow channels.

Embodiment 2

[0047] Lithium-sulfur battery cathode material, the preparation method comprising:

[0048] (1) heat treatment after halloysite is extracted with acid, specifically:

[0049]Add 10g of natural halloysite solid powder to a solution consisting of 28ml of concentrated hydrochloric acid with a mass fraction of 38% and 7ml of deionized water, react at 70°C for 120min, then centrifuge, wash and filter to obtain a solid, and place it in an oven at 80°C Dry for 24 hours to obtain halloysite powder purified by acid leaching. Put the purified halloysite powder in a tube furnace under an argon atmosphere, keep it at 300°C for 3h, and heat up at a rate of 5°C / min. Heat-treated halloysite powder.

[0050] (2) Dispersing the halloysite processed in step (1) in a solvent, adding the polymer and oxidant to the solvent to obtain a semi-finished product after polymerization, specifically:

[0051] Add 0.1g of halloysite treated in step (1) into 90ml of deionized water, ultrasonicate at room t...

Embodiment 3

[0056] Lithium-sulfur battery cathode material, the preparation method comprising:

[0057] (1) heat treatment after halloysite is extracted with acid, specifically:

[0058] Add 10g of natural halloysite solid powder to a solution consisting of 28ml of concentrated hydrochloric acid with a mass fraction of 38% and 7ml of deionized water, react at 70°C for 120min, then centrifuge, wash and filter to obtain a solid, and place it in an oven at 80°C Dry for 24 hours to obtain halloysite powder purified by acid leaching. Put the purified halloysite powder in a tube furnace under an argon atmosphere, keep it at 300°C for 3h, and heat up at a rate of 5°C / min. Heat-treated halloysite powder.

[0059] (2) Dispersing the halloysite processed in step (1) in a solvent, adding the polymer and oxidant to the solvent to obtain a semi-finished product after polymerization, specifically:

[0060] Add 0.1 g of halloysite treated in step (1) into 90 ml of deionized water, sonicate at room tem...

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Abstract

The invention provides a lithium-sulfur battery positive electrode material. The lithium-sulfur battery positive electrode material comprises a matrix layer, a polymer layer and a core layer, whereinthe polymer layer wraps the matrix layer, and the core layer is arranged in the matrix layer. The invention also provides a preparation method of the lithium-sulfur battery positive electrode material. In the lithium-sulfur battery positive electrode material provided by the invention, the conductive polymer layer wraps the matrix layer, and the matrix layer is filled with the core layer; meanwhile, by a physical limitation effect of a one-dimensional pipeline of the matrix layer and an absorption effect of a chemical constituent, the problems that the battery capacity and cycle retention ratecan be relatively low and the integral electrochemical performance is low by a shuttle effect of intermediate product polysulfide ions generated during the charging and discharging process of a sulfur positive electrode of a lithium-sulfur battery are solved; and the matrix layer is a halloysite layer, the shuttling of the polysulfide ions can be prevented from two aspects of physical limitationand chemical absorption, the halloysite is used as natural mineral at a low cost, the cost of the position electrode also can be reduced by using the halloysite as a matrix, and promotion and application are facilitated.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] With the rapid development of new energy vehicles and mobile electronic devices, batteries with higher energy density are urgently needed. In the new energy system, lithium-sulfur batteries have become one of the most promising secondary battery systems for the next generation due to their high theoretical specific energy (2600W h / kg), low cost of elemental sulfur, and environmental friendliness. [0003] Typical lithium-sulfur batteries generally use elemental sulfur as the positive electrode and metal lithium sheets as the negative electrode. However, there are three main problems in lithium-sulfur batteries: (1) elemental sulfur and the discharge product lithium sulfide are non-conductive or low-conductive substances, and the conductivity is very poo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/628H01M10/052Y02E60/10
Inventor 韩凯王云艳王璐璐贺亚灵叶红齐
Owner CENT SOUTH UNIV
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