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

A technology for lithium-sulfur batteries and positive electrode materials, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of unsatisfactory capacity, poor battery cycle performance, poor conductivity, etc., and achieve the suppression of shuttle effect, strong chemical adsorption, The effect of increasing capacity

Active Publication Date: 2020-10-09
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a lithium-sulfur battery positive electrode material and its preparation method and lithium-sulfur battery, the purpose is to solve the poor conductivity of the compound of activated carbon and sulfur and the existing problems of polysulfide ion dissolution, which lead to poor cycle performance and unsatisfactory capacity performance of the battery The problem

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

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specific Embodiment approach 1

[0017] Embodiment 1: This embodiment describes a lithium-sulfur battery positive electrode material, the positive electrode material includes activated carbon, carbon black, transition metal and sulfur, and the mass ratio of activated carbon, carbon black, transition metal and sulfur is 10~ 30: 1~10: 1~10: 60~80.

specific Embodiment approach 2

[0018] Specific embodiment two: a kind of positive electrode material of lithium-sulfur battery described in specific embodiment one, the specific surface area of ​​described activated carbon is 1000~4000 m 2 / g; The specific surface area of ​​the carbon black is 600~3000 m 2 / g; the transition metal is Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Pt, lanthanide or actinide metal; Said sulfur is sublimed sulfur.

specific Embodiment approach 3

[0019] Specific embodiment three: a preparation method of a lithium-sulfur battery positive electrode material described in specific embodiment one or two, the preparation method is as follows: active carbon, carbon black and transition metal are mixed and ground until the mixture can be completely Sieve, then mix with sulfur, grind so that the mixture can be completely sieved, add carbon disulfide to submerge the solid surface, let it stand at room temperature until the carbon disulfide is volatilized, remove the sulfur precipitated on the surface, 60~100 o C blast drying for 6~24h, grinding and sieving, 150~350 o C is placed in a closed container and heated for 1-24 h, ground and sieved to obtain the lithium-sulfur battery positive electrode material; the mesh size of the sieve used is 50-300 mesh; the grinding is manual grinding or mechanical ball milling.

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Abstract

A positive electrode material for a lithium sulphur battery and a preparation method thereof, and the lithium sulphur battery are disclosed. The positive electrode material comprises activated carbon,carbon black, transition metal or a transition metal compound, and sublimed sulfur; and the transition metal compound is metal carbide, metal boride, metal nitride, metal phosphide, metal oxide or metal sulfide. The activated carbon is utilized as a main body of sulfur carrying; the carbon black can carry sulfur and can also strengthen the conductivity of the positive electrode material; and thetransition metal or the transition metal compound can play a fixation role in lithium polysulfide produced in an electrochemical reaction, inhibits the shuttle effect of polysulfide ions, and enablesthe cycle performance of the lithium sulphur battery to be improved. The positive electrode material for the lithium sulphur battery disclosed by the invention has the advantages of being simple and easy to obtain, easy to be prepared on a large scale, and the like, and the lithium sulphur battery with long circulation, high specific capacity and high specific energy can be obtained.

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, a preparation method thereof, and a lithium-sulfur battery. 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 2600 Wh / 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. Generally speaking, sulfur needs to be compounded with porous carbon to improv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCY02E60/10
Inventor 潘跃德李素丽徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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