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A kind of positive electrode material of lithium-sulfur battery and preparation method thereof

A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of rapid capacity decline, poor conductivity, and low effective sulfur load, and achieve improved cycle stability and efficiency , the effect of improving cycle stability

Active Publication Date: 2020-12-11
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a lithium-sulfur battery positive electrode material and a preparation method thereof in view of the problems that the existing lithium-sulfur battery positive electrode material has a low sulfur effective load, poor electrical conductivity, and rapid capacity decline. The material uses a double-layer metal oxide with a synergistic effect and a porous structure as a new type of sulfur-based positive electrode material, which can form a stable metal oxide-sulfur-coated structure with sulfur, which significantly improves the effective utilization of sulfur in the positive electrode material of lithium-sulfur batteries. The loading capacity effectively avoids the "shuttle effect" of polysulfides, resulting in excellent electrochemical performance and strong cycle stability

Method used

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  • A kind of positive electrode material of lithium-sulfur battery and preparation method thereof
  • A kind of positive electrode material of lithium-sulfur battery and preparation method thereof
  • A kind of positive electrode material of lithium-sulfur battery and preparation method thereof

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Embodiment 1

[0033] The positive electrode material of the lithium-sulfur battery, the raw material includes porous Fe 2 o 3 / TiO 2 Composite metal oxide and nano sulfur.

[0034] The preparation method of the positive electrode material of the lithium-sulfur battery comprises the following steps:

[0035] (1) Fe 4 Ti 12 Al 94 Alloy strip preparation: Fe was first prepared from Al, Ti and Fe by refining in a vacuum electric arc furnace 4 Ti 12 Al 94 Ingot, in which Al, Ti and Fe are all 99.99wt% high-purity; Fe is then melt-spun 4 Ti 12 Al 94 The ingot is made into an alloy strip with a thickness of 20 μm and a width of 3 mm;

[0036] (2) Porous Fe 2 o 3 / TiO 2 Preparation of composite metal oxides: first divide the alloy ribbon obtained in step (1) into alloy strips each with a mass of 3 g, and then place the alloy strips in 2 L of NaOH solution with a concentration of 2 mol / L and spontaneously oxidize them at 25 ° C for 10 Alloying was carried out by etching Al for 1 hour;...

Embodiment 2

[0042] The positive electrode material of the lithium-sulfur battery, the raw material includes porous Fe 2 o 3 / TiO 2 Composite metal oxide and nano sulfur.

[0043] The preparation method of the positive electrode material of the lithium-sulfur battery comprises the following steps:

[0044] (1) Fe 4 Ti 12 Al 94 Alloy strip preparation: Fe was first prepared from Al, Ti and Fe by refining in a vacuum electric arc furnace 4 Ti 12 Al 94 Ingot, in which Al, Ti and Fe are all 99.99wt% high-purity; Fe is then melt-spun 4 Ti 12 Al 94 The ingot is made into an alloy strip with a thickness of 20 μm and a width of 3 mm;

[0045] (2) Porous Fe 2 o 3 / TiO 2 Preparation of composite metal oxides: first divide the alloy ribbon obtained in step (1) into alloy strips each with a mass of 5 g, and then place the alloy strips in 2 L of NaOH solution with a concentration of 2 mol / L and spontaneously oxidize them at 25 °C for 12 Alloying was carried out by etching Al for 1 hour; ...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. The positive electrode material of this kind of lithium-sulfur battery, the raw material includes porous Fe 2 o 3 / TiO 2 Composite metal oxide and nano sulfur. This lithium-sulfur battery cathode material uses a double-layer metal oxide with a synergistic effect and a porous structure as a new type of sulfur-based cathode material, which can form a stable metal oxide-sulfur-coated structure with sulfur, which significantly improves the performance of lithium-sulfur batteries. The effective loading of sulfur in the cathode material effectively avoids the "shuttle effect" of polysulfides, resulting in excellent electrochemical performance and strong cycle stability.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] Batteries are now used in a wide range of applications, such as advanced portable electronics, growing electric vehicles, and large energy storage devices. With the increasing application of batteries, there is an urgent need for battery systems with high energy density and long cycle life. At the same time, traditional lithium-ion batteries have been limited by the low theoretical energy density limit (300mAh / g), and it is difficult to meet the quality requirements for practical application of lithium-ion batteries. Therefore, the development of next-generation high-energy-density batteries is of great strategic importance. Because lithium-sulfur batteries have excellent theoretical energy density, which can reach 2567Wh / kg, and sulfur as a pos...

Claims

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Application Information

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