Lithium-sulfur battery multilayer composite positive electrode and preparation method thereof

A multi-layer composite, lithium-sulfur battery technology, applied in the field of electrochemical batteries, achieves the effects of simple preparation process, increased electron and ion transport, and low-cost preparation

Active Publication Date: 2014-08-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, from the perspective of the entire lithium-sulfur battery, it is rare to comprehensively consider the various influencing factors of...

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  • Lithium-sulfur battery multilayer composite positive electrode and preparation method thereof
  • Lithium-sulfur battery multilayer composite positive electrode and preparation method thereof
  • Lithium-sulfur battery multilayer composite positive electrode and preparation method thereof

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Embodiment 1

[0035] Add 15 mg of graphene into ethanol and disperse uniformly by ultrasonication for 0.5 h (the graphene content in the dispersion is 0.5 mg / mL) and suction-filter it on a polytetrafluoroethylene filter membrane. Immerse the pumped graphene membrane and the polytetrafluoroethylene filter membrane in water, use the polytetrafluoroethylene filter membrane and the graphene membrane to have different hydrophilicity and hydrophobicity in water to effectively separate the graphene membrane, take it out and dry it to remove the solvent to get the first graphite vinyl film layer, see image 3 (a), the thickness of the first graphene film layer is 25 μm. On one surface of the first graphene film layer, the slurry coating formed by mixing sulfur: conductive carbon black: binder (polyvinylidene fluoride) in a weight ratio of 7:2:1, on the first graphene film layer A carbon / sulfur active material layer is formed on the surface of the layer, and it is vacuum-dried at 70°C for 12 ho...

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Abstract

The invention discloses a lithium-sulfur battery multilayer composite positive electrode and a preparation method thereof, and belongs to the field of electrochemical batteries. The lithium-sulfur battery multilayer composite positive electrode has a multiple composite structure consisting of a first graphene thin-film layer, a carbon/sulfur active substance layer, a second graphene thin-film layer and a polymer layer, and multi-element integrated design of the lithium-sulfur batteries is realized. The positive electrode is characterized in that the performances of the lithium-sulfur battery are realized by integrally designing elements of the lithium-sulfur battery, the first graphene thin-film layer plays a role of a current collector, so that the weight of the current collector in the battery is effectively reduced and the effective contact between the current collector and an active electrode material is improved; and the second graphene thin-film layer and the polymer layer play a role of a diaphragm, are equivalent to a solid electrolysis layer and a barrier layer of a polysulfide, and are capable of effectively increasing transmission of electrons and ions and greatly limiting shuttling of polysulfide ions. The multilayer composite-structure positive electrode is simple and easily controllable in preparation process, can be prepared in large scale with low cost, and has great application value.

Description

technical field [0001] The invention belongs to the technical field of electrochemical batteries, and in particular relates to a lithium-sulfur battery multilayer composite positive electrode and a preparation method thereof. Background technique [0002] With the increasing demand for energy storage such as electric vehicles, hybrid electric vehicles and large-scale smart grids, high-efficiency energy storage devices as the power basis for these applications have attracted extensive attention, and are also very important for the development of lightweight and high energy density, power density and High demands are placed on secondary batteries with good cycle stability. Electrode materials and their structural design are key factors in the development of high-performance secondary batteries. The current commercial secondary lithium batteries mainly use positive electrode materials such as lithium cobaltate, lithium manganese oxide and lithium iron phosphate, but the mass s...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/66H01M2/16H01M4/139H01M10/052H01M50/411H01M50/417H01M50/431H01M50/451
CPCY02E60/122H01M4/13H01M4/139H01M4/663H01M10/052Y02E60/10
Inventor 李峰周光敏宋仁升裴松峰黄坤李璐成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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