A kind of sulfur-containing composite material and its preparation method and application
A composite material and composite technology are applied in the field of sulfur-containing composite materials and their preparation, which can solve the problem that the sulfur positive electrode has no carrier material, and achieve the effect of taking into account the rate performance.
Active Publication Date: 2020-12-04
ZHUHAI COSMX BATTERY CO LTD
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problem that there is no suitable carrier material for the sulfur positive electrode of the existing lithium-sulfur battery, and to provide a sulfur-containing composite material and its preparation method and application
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specific Embodiment approach 1
[0020] Specific embodiment 1: This embodiment describes a sulfur-containing composite material, which contains a graphene layer, XMn 2 o 4 Nanosheets, sulfur, where X=Co, Zn or Mg;
[0021] The graphene layer and XMn 2 o 4 The nanosheets are alternately stacked, and the graphene layers and XMn 2 o 4 The interlayers of the nanosheets contain sulfur, such as figure 1 shown.
specific Embodiment approach 2
[0022] Specific embodiment two: a kind of sulfur-containing composite material described in specific embodiment one, the XMn 2 o 4 The crystal structure is spinel.
specific Embodiment approach 3
[0023] Embodiment 3: An application of the sulfur-containing composite material described in Embodiment 1 or Embodiment 2. The sulfur-containing composite material is applied to the positive electrode of a lithium-sulfur battery.
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Abstract
The invention discloses a sulfur-containing composite material as well as a preparation method and an application thereof, which belong to the technical field of lithium-sulfur batteries. The sulfur-containing composite material contains a graphene layer, an XMn2O4 nanosheet layer and sulfur, wherein X is Co, Zn or Mg; the graphene layers and the XMn2O4 nanosheet layers are alternately stacked, and sulfur is contained between the graphene layers and the XMn2O4 nanosheet layers. The sulfur-containing composite material is applied to a positive electrode of a lithium-sulfur battery. The preparation method has the advantages that a graphene / XMn2O4 nanosheet compound is obtained through a simple solution method, the synthesis method is easy to amplify, industrial production is performed, and the composite material can be prepared on a large scale. When the composite material disclosed by the invention is used as a positive electrode material of a lithium-sulfur battery, the high conductivity of graphene is utilized, and the rate capability, the capacity exertion and the cycling stability of the lithium-sulfur battery are considered due to the adsorption effect of the bimetallic oxide XMn2O4 on polysulfide ions, so that the high-performance lithium-sulfur battery can be obtained.
Description
technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a sulfur-containing composite material and its preparation method and application. Background technique [0002] A lithium-sulfur battery consists of a positive electrode containing electroactive sulfur, a negative electrode containing lithium, an electrolyte, and a separator. The theoretical specific energy of lithium-sulfur batteries is as high as 2600Wh / kg, and the actual specific energy is higher than that of current commercial lithium-ion batteries. This significant advantage in specific energy makes lithium-sulfur batteries have a wide range of potential applications in special power sources, electric vehicles, and high-altitude aircraft. [0003] The cathode material of lithium-sulfur batteries is the key technology of lithium-sulfur batteries. Metal oxides are an important support material for sulfur (Adv. Mater. 2017, 29, 1601759). Magnesi...
Claims
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IPC IPC(8): H01M4/38H01M4/62H01M4/13H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/13H01M4/38H01M4/625H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 潘跃德李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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