Lithium-sulfur battery cathode composite material and preparation method thereof

A composite material and lithium-sulfur battery technology, applied in electrode manufacturing, battery electrodes, lithium batteries, etc., can solve the problems of reduced coulombic efficiency cycle life, irreversible loss of active material sulfur, blocking charge transmission channels, etc., to overcome rapid capacity decay , Overcome the effect of poor cycle performance and simple preparation process

Active Publication Date: 2015-03-04
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the poor conductivity of elemental sulfur, polysulfides that are easily soluble in the organic electrolyte are formed during charging and discharging, and the polysulfides further react to form insoluble lithium sulfide, which causes irreversible loss of the active material sulfur, resulting in a rapid decline in battery capacity. A series of problems such as greatly reduced Coulombic efficiency and cycle life, or when sulfide insoluble in the electrolyte solvent covers the sulfur cathode and blocks the charge transport channel, the voltage drops rapidly and the reaction stops

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  • Lithium-sulfur battery cathode composite material and preparation method thereof
  • Lithium-sulfur battery cathode composite material and preparation method thereof
  • Lithium-sulfur battery cathode composite material and preparation method thereof

Examples

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Embodiment 1

[0067] Poly(N-vinylcarbazole) with a molecular weight of 25000 and sulfur were mixed at a mass ratio of 1:4, and then dissolved in carbon disulfide (CS 2 ), stirred evenly at a speed of 500 rpm, then heated to a temperature of 40°C, and continued to stir until the organic solvent was completely volatilized to obtain a solid mixture; the solid mixture was placed in a tube furnace filled with nitrogen, and heated at a temperature of 155° After heating for 12 hours under the condition of 160°C, continue heating for 6 hours; after cooling the heated sample to room temperature, put it in an agate mortar, add a small amount of alcohol for wet grinding, and finally place it in a blast drying oven Drying at a temperature of 40° C. for 2 hours to obtain a lithium-sulfur battery cathode composite material with a particle size of 0.2-5 μm. The tube furnace is mainly used for metallurgy, glass, heat treatment, lithium battery positive and negative materials, new energy, mold and other ind...

Embodiment 2

[0073] Mix poly(N-vinylcarbazole) with a molecular weight of 1,100,000 and sulfur at a mass ratio of 3:7, then dissolve in benzene, stir evenly at a speed of 750rpm, then heat to a temperature of 70°C, and continue to stir until the organic solvent All volatilized to obtain a solid mixture; the solid mixture was placed in a tube furnace filled with argon, heated at a temperature of 152°C for 6 hours, and then heated at a temperature of 180°C for 6 hours; the heated The sample was lowered to room temperature for dry grinding, and finally dried in a blast drying oven at a temperature of 60° C. for 4 hours to obtain a lithium-sulfur battery cathode composite material with a particle size of 3-50 μm.

[0074] Mix the lithium-sulfur battery cathode composite material prepared in the present invention, acetylene black, and polyvinylidene fluoride (PVDF) in a mass ratio of 85:10:5, stir to obtain a uniform slurry, and then coat the slurry evenly Spread on aluminum foil and dry. The ...

Embodiment 3

[0078] Mix poly(N-vinylcarbazole) with a molecular weight of 500,000 and sulfur at a mass ratio of 6:9, then dissolve in toluene, stir evenly at a speed of 1500rpm, then heat to a temperature of 70°C, and continue to stir until the organic solvent All volatilized to obtain a solid mixture; the solid mixture was placed in a tube furnace filled with helium, heated at a temperature of 158°C for 18 hours, and then heated at a temperature of 300°C for 8 hours; the heated The sample was lowered to room temperature for dry grinding, and finally dried in a blast drying oven at a temperature of 50° C. for 3 hours to obtain a lithium-sulfur battery cathode composite material with a particle size of 30-100 μm.

[0079] Mix the lithium-sulfur battery cathode composite material prepared in the present invention, acetylene black, and polyvinylidene fluoride (PVDF) in a mass ratio of 94:4:2, stir to obtain a uniform slurry, and then coat the slurry evenly Spread on aluminum foil and dry. Th...

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Abstract

The invention discloses a lithium-sulfur battery cathode composite material and a preparation method thereof. According to the cathode composite material, elemental sulfur is cladded by an electric-conduction polymer poly(N-vinylcarbazole), the sulfur cathode material is guaranteed to have good electric conductivity, also sulfur and electro-discharge products thereof are constrained in the sulfur cathode material, so that relatively high sulfur utilization rate and cycling stability are obtained. According to the technical scheme, the disadvantages of sulfur as a lithium ion secondary cell cathode material are overcome, the lithium-sulfur battery cathode composite material, which is long in cycling life, high in capacity, green, environment-friendly, and simple in method, is prepared. The preparation method is simple, equipment is simple, raw material source is wide, cost is low, and the preparation method is in favor of industrial production.

Description

technical field [0001] The invention relates to a battery cathode material, in particular to a lithium-sulfur battery cathode composite material and a preparation method thereof. Background technique [0002] With the continuous acceleration of the modernization process, the ensuing energy shortage has become a major challenge faced by our country and even countries all over the world. The storage of energy, especially electric energy, is one of the key issues that need to be solved urgently in the 21st century. At present, portable electronic products such as mobile phones, as large as electric vehicles and aerospace vehicles, and then to the development and utilization of renewable energy such as wind energy and solar energy, all rely on the storage of electric energy, and secondary batteries have high energy density. As an energy storage and conversion device, it is playing an irreplaceable role. Secondary batteries use the reversibility of chemical reactions to form a n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/04H01M10/052
CPCH01M4/0471H01M4/366H01M4/624H01M10/052Y02E60/10
Inventor 王斌程建丽黄玲
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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