Lithium-sulfur battery carbon fiber reinforced three-dimensional graphene-sulfur positive electrode material, preparation method of material and preparation method of positive electrode
A technology of sulfur cathode materials and lithium-sulfur batteries, which is applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of poor rate performance and low area specific capacity of graphene-sulfur electrodes, so as to improve conductivity and avoid metal accumulation. The effect of the use of current flow device and binder, improvement of rate performance and cycle life
Active Publication Date: 2015-05-13
HARBIN INST OF TECH
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Problems solved by technology
[0006] The present invention aims to solve the technical problems of low area specific capacity and poor rate performance of existing graphene-sulfur electrodes, and provides a carbon fiber reinforced three-dimensional graphene-sulfur positive electrode for lithium-sulfur batteries and its preparation method and positive electrode preparation method
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specific Embodiment approach 1
[0020] Embodiment 1: A carbon fiber reinforced three-dimensional graphene-sulfur positive electrode material for a lithium-sulfur battery in this embodiment is that elemental sulfur is dispersed in the pores inside the carbon fiber modified sponge-like graphene, wherein the mass percentage of elemental sulfur in the positive electrode material is 40%-85%, the mass percentage of carbon fiber is 2%-8%, and the mass percentage of graphene is 7%-58%.
specific Embodiment approach 2
[0021] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the mass fraction of elemental sulfur is 50% to 80%, the mass fraction of carbon fiber is 5% to 6%, and the mass percentage of graphene is 14% to 45%. . Others are the same as in the first embodiment.
specific Embodiment approach 3
[0022] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the mass fraction of elemental sulfur is 70%, the mass fraction of carbon fiber is 10%, and the mass percentage of graphene is 20%. Others are the same as in the first embodiment.
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Abstract
The invention discloses a lithium-sulfur battery carbon fiber reinforced three-dimensional graphene-sulfur positive electrode material, a preparation method of the positive electrode material and a preparation method of the positive electrode, relates to a lithium-sulfur battery positive electrode material, a preparation method of the positive electrode material and a preparation method of the positive electrode, and can be used for solving the technical problem that the conventional graphene-sulfur electrode is low in area specific capacity and bad in rate capability. The positive electrode material is formed by dispersing elemental sulfur in holes of carbon fiber modified spongy graphene. The preparation method of the positive electrode material comprises the following steps: adding carbon fibers into mixed liquid of graphene oxide dispersion liquid, carrying out hydro-thermal synthesis to obtain hydrogel and carrying out freeze-drying to obtain carbon fiber modified three-dimensional spongy graphene; cutting the carbon fiber modified three-dimensional spongy graphene into slices, sprinkling the elemental sulfur on the surfaces of the slices, placing the slices in a vacuum tank and heating to obtain the lithium-sulfur battery carbon fiber reinforced three-dimensional graphene-sulfur positive electrode material. The positive electrode is prepared by slicing the positive electrode material and then pressing. The area specific capacity of the electrode material is up to 10 mAh / cm<2>, so that the electrode material can be applied to lithium ion batteries.
Description
technical field [0001] The invention relates to a lithium-sulfur battery cathode material, a preparation method thereof, and a preparation method of the cathode. Background technique [0002] In recent years, with the continuous advancement of science and technology and the rapid development of various electronic products, the chemical power sources used are required to have the characteristics of light weight, small size, and large capacity. The specific energy of current commercial lithium-ion batteries based on lithium intercalation / extraction is limited by the theoretical specific capacity of their cathode materials, such as LiCoO 2 The theoretical specific capacity of the battery is 274mAh / g. In order to maintain the reversibility and safety of the charge-discharge cycle, only half of the lithium is deintercalated during actual charging. Therefore, the current specific energy of lithium-ion batteries is difficult to exceed 200Wh / kg. The stagnation of cathode materials...
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IPC IPC(8): H01M4/38H01M4/62H01M4/139
CPCH01M4/04H01M4/139H01M4/362H01M4/62H01M4/625Y02E60/10
Inventor 秦伟卢松涛吴晓宏
Owner HARBIN INST OF TECH
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