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Integrated electrode for lithium sulphur battery and preparation method of integrated electrode

A lithium-sulfur battery and electrode technology, used in battery electrodes, non-aqueous electrolyte battery electrodes, lithium batteries, etc., can solve problems such as affecting battery cycle stability, easily decomposing or dissolving, reducing battery energy density, etc., to achieve a good cycle. Effects of stability, mass reduction, and energy density improvement

Active Publication Date: 2014-06-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the preparation of the electrode is simple, there are some problems: 1. The carbon-sulfur composite and the current collector are only bonded together by a binder, and the contact resistance between the two cannot be avoided; 2. Additional conductive agents are added to increase The content of carbon in the positive electrode is reduced, which is equivalent to reducing the content of elemental sulfur, thereby reducing the energy density of the battery; 3. The binders added are all high-molecular organic substances, which are expensive, and these organic substances are easily damaged during battery operation. Decompose or dissolve into the electrolyte, affecting the cycle stability of the battery

Method used

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  • Integrated electrode for lithium sulphur battery and preparation method of integrated electrode
  • Integrated electrode for lithium sulphur battery and preparation method of integrated electrode
  • Integrated electrode for lithium sulphur battery and preparation method of integrated electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Weigh 5g of sucrose, dissolve it in deionized water, add 0.5g of 98% sulfuric acid to form slurry A, the concentration of slurry A is 90%, and the area is 6.25cm 2 The carbon paper (thickness is 90μm), impregnate it into slurry A, take it out after completely infiltrating, dry at 80°C for 12 hours, and dry at 160°C for 6 hours. ; Then the impregnated carbon paper was transferred to a tube furnace protected by argon, and fired at 900°C for 5h, and then lowered to room temperature. Transfer the calcined carbon paper to the gas-phase sulfur filling device (the gas-phase sulfur filling device is a closed container, and the container is filled with sulfur vapor during the sulfur filling process), and after filling sulfur at 300°C for 2 hours, the integrated product prepared by the present invention can be obtained. Electrode, wherein the sulfur content is 95%. The electrochemical performance was tested by assembling a button cell in an argon-filled glove box.

[0035] Depe...

Embodiment 2

[0038] Weigh 5g of phenolic resin (concentration is 60%), dilute it in ethanol to form slurry A, the concentration of slurry A is 5%, and the area is 6.25cm 2 Immerse the nickel foam into the slurry A, take it out after it is completely soaked, and dry it at 80°C for 12 hours. After multiple immersions, keep the pore residual rate of the nickel foam itself at 95%; then transfer the impregnated nickel foam to Calcined at 800°C for 3h in a tube furnace protected by argon, then cooled to room temperature. The roasted nickel foam is transferred to a gas-phase sulfur charging device, and after sulfur charging at 300° C. for 2 hours, the integrated electrode prepared by the present invention is obtained, wherein the sulfur charging amount is 5%. The electrochemical performance was tested by assembling a button cell in an argon-filled glove box.

Embodiment 3

[0040] Weigh 5g of phenolic resin (concentration: 60%), dilute it in ethanol, add 0.6g of carbon nanotubes, stir well to form slurry A, the concentration of slurry A is 40%, and the area is 6.25cm 2 Scrape-coat the carbon paper from the slurry A on the carbon paper, dry at 80°C for 12 hours, and the residual porosity of the carbon paper itself is 50%; In the furnace, bake at 900°C for 3h, then drop to room temperature. The integrated electrode prepared by the present invention is obtained by filling the calcined carbon paper with sulfur by melting method, wherein the sulfur filling amount is 75%. The electrochemical performance was tested by assembling a button cell in an argon-filled glove box. See attached for specific data figure 2 , attached image 3 .

[0041] The comparative example is the discharge performance of a button battery assembled with a carbon-sulfur composite prepared by using phenolic resin as the carbon source (sulfur-filling content of 75%) and electr...

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Abstract

The invention relates to an integrated electrode for a lithium sulphur battery and a preparation method of the integrated electrode. The integrated electrode is composed of a current collector, and a carbon-sulphur compound which is formed by than the current collector is subjected to in-situ growth; the carbon-sulphur compound comprises a conductive carbon material, and elemental sulphur with which a porous structure of the carbon material is filled, wherein the elemental sulphur accounts for 10 to 95% the carbon-sulphur compound in percentage by mass and is of 0.1 to 5mg / cm<2> in equivalent weight based on the current collector. The integrated electrode is simple in process and easy to realize. The electrode prepared by adopting the method is able to obviously reduce the contact resistance between the current collector and the carbon-sulphur compound and the utilization rate of active substance naming sulphur is also increased; in addition, the integrated electrode does not need any adhesive, so that the problem that the battery is poor in cycling stability because of the stability of the adhesive can be avoided, the cost is also saved, and the high commercial value is achieved.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to a lithium-sulfur battery electrode and a preparation method thereof. Background technique [0002] With the increasing shortage of fossil energy and the increasingly serious environmental problems, the development of new energy storage and conversion technologies has become the focus of the world's energy strategy. Among them, lithium-sulfur batteries are high-energy-density secondary batteries with great development potential and application prospects. [0003] Lithium-sulfur battery is a secondary battery with metal lithium as the negative electrode and elemental sulfur as the positive electrode. Its specific energy can theoretically reach 2600Wh / kg, and the actual energy density can reach 300Wh / kg at present, and it is very likely to increase to 300Wh / kg in the next few years. At the same time, the elemental sulfur cathode material has the advantages of abundant source...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/13H01M4/139
CPCY02E60/122H01M4/13H01M4/139H01M4/625H01M10/052Y02E60/10
Inventor 张华民王美日张益宁曲超王倩李婧聂红娇
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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