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A kind of electrode of lithium sulfur battery and its preparation method and application

A lithium-sulfur battery and electrode technology, which is applied in battery electrodes, non-aqueous electrolyte battery electrodes, lithium batteries, etc., can solve the problems of volume change of sulfur active material, low conductivity, affecting the comprehensive performance of lithium-sulfur batteries, etc.

Active Publication Date: 2021-03-30
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] At present, the current collector of lithium-sulfur battery still has the problem that the volume of sulfur active material is easy to change, and the conductivity is not high, which affects the comprehensive performance of lithium-sulfur battery.

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  • A kind of electrode of lithium sulfur battery and its preparation method and application
  • A kind of electrode of lithium sulfur battery and its preparation method and application
  • A kind of electrode of lithium sulfur battery and its preparation method and application

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Embodiment Construction

[0078] The content of the present invention will be described in further detail below through specific examples. The raw materials, reagents or devices used in the examples and comparative examples can be obtained from conventional commercial sources unless otherwise specified. Unless otherwise specified, experiments or testing methods are conventional methods in the art. The usage percentages mentioned in the examples all refer to mass percentages unless otherwise specified.

[0079] The present invention provides a new type of electrode structure for lithium-sulfur batteries - "sandwich" electrode, the schematic diagram of which is attached figure 1 shown. From figure 1 It can be seen that the surface of the current collector of the lithium-sulfur battery electrode of the present invention is provided with three structural layers, which are the microcracked carbon nanotube layer 1, the active material layer 2, and the multi-walled carbon nanotube and lithium titanate comp...

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Abstract

The invention discloses an electrode of a lithium-sulfur battery as well as a preparation method and application of the electrode. The electrode of the lithium-sulfur battery comprises a current collector, wherein a micro-crack carbon nanotube layer, an active substance layer, a carbon nanotube and a lithium titanate composite interlayer are sequentially arranged on the surface of the current collector. The preparation method of the lithium-sulfur battery electrode comprises the following steps: 1, preparing the micro-crack carbon nanotube layer; 2, preparing an active substance layer; 3, preparing a carbon nanotube and lithium titanate nanosphere composite material; and 4, preparing the composite interlayer. Meanwhile, the invention also provides a lithium-sulfur battery containing the electrode. The invention provides a lithium-sulfur battery electrode with a sandwich structure. According to the invention, the current collector with a large specific surface area and the interlayer with excellent performance are adopted, so that the binding force between an active substance and the current collector is increased, the volume change of the active substance is buffered, the shuttle effect is limited, the conductivity of the electrode is further improved, the cycle performance and the rate capability of the battery are enhanced, and an efficient energy storage and conversion mechanism is realized.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to an electrode of a lithium-sulfur battery and a preparation method thereof. Background technique [0002] A lithium-sulfur battery uses sulfur as the positive electrode of the battery and metallic lithium as the negative electrode. The current collector is an important part of collecting current on the lithium-sulfur battery, and its surface functional structure has an important impact on the conductivity, charge-discharge capacity, and cycle life of the lithium-sulfur battery. In lithium-sulfur batteries, the current collector is not only the carrier of the active material, but also the collector and transmitter of the current. It should have the characteristics of light and thin, low resistivity, and high bonding strength with the electrode material. [0003] At present, the current collectors of lithium-sulfur batteries still have the problem that the sulfur a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/139H01M4/13H01M10/052
CPCH01M4/13H01M4/139H01M4/38H01M4/62H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 袁伟潘琪琪邱志强王淳汤勇
Owner SOUTH CHINA UNIV OF TECH
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