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Preparation method of lithium-sulfur battery based on large-area thick film controllable texture photonic crystal

A technology of photonic crystals and lithium-sulfur batteries, applied in the field of preparation of photonic crystal lithium-sulfur batteries based on large-area thick-film controllable textures, can solve the problems of small area and uncontrollable thickness, and achieve simple process, low cost, high The effect of areal volume density

Active Publication Date: 2020-04-28
SHANGHAI JIAO TONG UNIV
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  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing a photonic crystal lithium-sulfur battery based on a large-area thick-film controllable texture in order to overcome the defects of the above-mentioned prior art, which solves the problem of small area and uncontrollable thickness in the prior art. technical problem

Method used

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  • Preparation method of lithium-sulfur battery based on large-area thick film controllable texture photonic crystal
  • Preparation method of lithium-sulfur battery based on large-area thick film controllable texture photonic crystal
  • Preparation method of lithium-sulfur battery based on large-area thick film controllable texture photonic crystal

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preparation example Construction

[0037] A method for preparing a photonic crystal lithium-sulfur battery based on a large-area thick-film controllable texture, comprising the following steps:

[0038] (1) Preparation of monodisperse microsphere suspension

[0039] (1.1) Put monodisperse microspheres with a particle size of 100nm-1000nm in a beaker, add a solvent, disperse ultrasonically, and make a suspension with a certain concentration. According to different substrates, the concentration of the suspension is 0.1-10 %;

[0040] (2) Pretreatment of substrate

[0041] (2.1) Ultrasonic cleaning the substrate in ethanol, acetone and isopropanol respectively, removing impurities and organic matter on the surface, and drying in an oven for subsequent use. The substrates that can be used are carbon fiber paper, carbon fiber cloth, Wire mesh or nickel foam, if metal mesh is used, stainless steel mesh, nickel mesh, titanium mesh, copper mesh, tungsten mesh, molybdenum mesh, zirconium mesh, lead mesh or platinum me...

Embodiment 1

[0055] Ultrasonic clean the small glass bottle used for the self-assembled silica opal template with deionized water for 20 min, at least 3 times, and ultrasonically clean the carbon fiber paper with deionized water, acetone, isopropanol and alcohol for 20 min each, and dry them for later use. Drop the silicon dioxide microsphere alcohol solution with a concentration of 2% and a diameter of 200nm into the glass bottle until it is full, and place the cleaned carbon fiber paper obliquely at the same time. Put the glass bottle into a blast drying oven, and keep the temperature at 35°C until the alcohol solution in the glass bottle is completely evaporated, so that photonic crystals can be self-assembled in the large pores of the carbon fiber paper. To prepare metal framework organic precursor, mix 0.84g zinc nitrate hexahydrate, 0.96g 2-methylimidazole, 25mL methanol and 25mL N,N-dimethylformamide and stir for 10min. The carbon fiber paper in the previous step was immersed in the...

Embodiment 2

[0058] Ultrasonic clean the small glass bottle used for the self-assembled silica opal template with deionized water for 20 min, at least 3 times, and ultrasonically clean the nickel mesh with deionized water, acetone, isopropanol and alcohol for 20 min each, and dry them for later use. Drop the silicon dioxide microsphere alcohol solution with a concentration of 5% and a diameter of 300nm into the glass bottle until it is full, and place the cleaned nickel mesh obliquely at the same time. Put the glass bottle into a blast drying oven and keep the temperature at 35°C until the alcohol solution in the glass bottle evaporates completely, so that photonic crystals are self-assembled in the large pores of the nickel mesh. To prepare metal framework organic precursor, mix 0.42g zinc nitrate hexahydrate, 0.48g 2-methylimidazole, 25mL methanol and 25mL N,N-dimethylformamide and stir for 10min. The nickel mesh from the previous step was immersed in the metal frame organic precursor so...

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Abstract

The invention relates to a preparation method of a lithium-sulfur battery based on a large-area thick film controllable texture photonic crystal, which is characterized in that a vertical sedimentation self-assembly method is used; along with the volatilization of a solvent, monodisperse microspheres are arranged in macropores of a base material to form a photonic crystal structure, the photonic crystal is used as a template, ordered microporous carbon is synthesized in gaps of the template, and the photonic crystal template is removed to obtain a carbon photonic crystal with a three-dimensional ordered hierarchical porous structure, so that the large-area thick film controllable texture photonic crystal is formed. The texture photonic crystal is compounded with elemental sulfur to obtaina sulfur positive electrode, and lithium metal is taken as a counter electrode so as to assemble the lithium-sulfur battery. By changing the thickness of the base material and the concentration of a turbid liquid, the thick film controllability of the electrode thickness ranging from 10 micrometers to 650 micrometers is achieved, and meanwhile, large-area preparation with the electrode area ranging from 0.1cm<2> to 400cm <2> is achieved by changing the area of the base material. In addition, high load of sulfur from 1-15mg.cm<-2> is achieved by adjusting the concentration of an organic solution of sulfur, so that high surface capacity density and surface energy density of the lithium-sulfur battery are realized.

Description

technical field [0001] The invention relates to materials and preparation methods in the technical field of lithium batteries, in particular to a preparation method for lithium-sulfur batteries based on large-area thick film controllable texture photonic crystals. Background technique [0002] With the depletion of natural resources, traditional non-renewable energy can no longer meet the needs of the development of human society, and people's demand for alternative energy is becoming increasingly urgent. As a commonly used electrochemical storage device, lithium-ion batteries have the characteristics of good thermal safety, good reversibility and non-toxicity. However, in view of the fact that lithium-ion batteries are based on the reaction mechanism of lithium ions intercalating lithium back and forth between the two electrodes, its theoretical specific capacity and energy density are limited, which cannot meet the needs of high-power equipment such as power vehicles. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/052H01M4/139C30B29/18C30B29/02
CPCH01M10/058H01M10/052H01M4/139C30B29/18C30B29/02Y02E60/10Y02P70/50H01M4/13H01M4/38H01M4/0416H01M4/663H01M4/0471H01M4/1395H01M10/0525Y10T29/49108
Inventor 胡晓斌林升炫蔡子贺肖佳佳
Owner SHANGHAI JIAO TONG UNIV
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