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Chalcogenide composite cathode material, an all-solid-state lithium battery thereof and a preparation method thereof

A composite positive electrode material and lithium battery technology, which is applied in the manufacture of electrolyte batteries, positive electrodes, secondary batteries, etc., can solve the problems of limited energy density improvement of all-solid-state lithium batteries, poor cycle performance of all-solid-state lithium batteries, and low active material loading capacity and other issues, to achieve the effect of improving cycle performance and capacity retention rate, simple structure, and high output energy density

Active Publication Date: 2019-01-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low electronic conductivity and ionic conductivity of sulfur, a large amount of ion conductivity agent and electron conductivity agent are required in the positive stage of the all-solid-state lithium-sulfur battery, resulting in a low loading capacity of the active material in the positive stage, and the all-solid-state lithium-sulfur battery The energy density increase is limited
Due to the use of different materials in the composite positive layer and the electrolyte layer in the all-solid lithium battery, there is a potential difference between the two, and a space charge layer is generated at the interface, which increases the interface impedance, resulting in poor cycle performance of the all-solid lithium battery and low capacity. retention rate is not high

Method used

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  • Chalcogenide composite cathode material, an all-solid-state lithium battery thereof and a preparation method thereof
  • Chalcogenide composite cathode material, an all-solid-state lithium battery thereof and a preparation method thereof
  • Chalcogenide composite cathode material, an all-solid-state lithium battery thereof and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This example uses Li 6 P.S. 5 Cl sulfide electrolyte, which not only serves as the positive electrode active material, but also serves as the material of the solid electrolyte layer. Commercial multi-walled carbon nanotubes are used as conductive carbon materials, and lithium indium alloys are used as negative electrode materials to assemble all-solid lithium-ion batteries. The specific steps are as follows:

[0037] (1) will P 2 S 5 (Aladding 99%), Li 2 S (Alfa 99.9%) and LiCl (Aladding 99.99%) were ball milled for 1 hour at a speed of 100 rpm; then the mixture was sealed and heat-treated at 550°C for 3 hours to obtain Li 6 P.S. 5 Cl sulfide electrolyte.

[0038] (2) will Li 6 P.S. 5 Cl sulfide electrolyte and multi-walled carbon nanotubes (mass ratio 86:14) were mixed by dry ball milling at a speed of 300rpm for 1h to complete the preparation of the composite cathode powder.

[0039] (3) Weigh 70mg Li 6 P.S. 5Cl sulfide electrolyte powder, in a mold with a ...

Embodiment 2

[0046] This example uses Li 6 P.S. 5 Cl sulfide electrolyte, which is used not only as the positive electrode active material, but also as the material of the solid electrolyte layer. A variety of carbon composite materials are commercially used as conductive carbon materials, lithium-indium alloys are used as negative electrode materials, and solid lithium-ion batteries are assembled. The specific steps are as follows:

[0047] (1) will P 2 S 5 (Aladding 99%), Li 2 S (Alfa 99.9%) and LiCl (Aladding 99.99%) were ball milled for 1 hour at a speed of 100 rpm; then the mixture was sealed and heat-treated at 550°C for 3 hours to obtain Li 6 P.S. 5 Cl sulfide electrolyte.

[0048] (2) Mixing Super P and VGCF according to the mass ratio of 2:1 at a speed of 300rpm for 1h by dry ball milling can complete the preparation of various carbon composite materials.

[0049] (3) Will Li 6 P.S. 5 The composite material of Cl sulfide electrolyte and various carbons (mass ratio 70:30) ...

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Abstract

The invention discloses a composite cathode material, a preparation method thereof and an application in an all-solid-state lithium battery. Positive composite materials include sulfide and conductivecarbon with thioagermanite crystal structure, in which the sulfide not only acts as the release capacity of active material, but also acts as an electrolyte to conduct lithium ions; Conducting carbonmaterials play the role of conducting electrons; The mass ratio of the sulfide to the conductive carbon material can be (20-90): (80-10). The sulfide electrolyte used in the electrolyte layer is thesame as the sulfide electrolyte used in the composite positive stage when assembling all-solid-state batteries. The obtained all-solid-state lithium battery has the advantages of simple structure, small interface impedance, small overall impedance, high safety performance, high output energy density, good cycle stability and high capacity retention rate.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a sulfur-based composite positive electrode material, an all-solid-state lithium battery, and a preparation method thereof. Background technique [0002] At present, with the wide application of new energy vehicles and portable electronic devices, people's demand for lithium-ion batteries is increasing. However, the organic liquid electrolyte used in traditional lithium-ion batteries is flammable and explosive. At the same time, the growth of lithium dendrites during the cycle can easily pierce the separator and cause a short circuit. Replacing liquid electrolyte with inorganic ceramic solid electrolyte will eliminate safety hazards from the root. Therefore, all-solid-state lithium batteries have become an inevitable trend in the development of lithium batteries in the future. [0003] Sulfur is used as the positive active material, and the traditional positive ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01M10/058
CPCH01M4/364H01M4/5815H01M4/625H01M10/0525H01M10/058H01M2004/021H01M2004/028Y02E60/10Y02P70/50
Inventor 南策文王硕李亮亮沈洋林元华
Owner TSINGHUA UNIV
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