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Composite electrode and preparation method and application thereof

A composite electrode and hybrid technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as loss of active materials, and achieve the effects of improving electrical conductivity, achieving uniform dispersion, and good electron transmission capacity.

Inactive Publication Date: 2017-06-20
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

In addition, in the cycle, polysulfides may also reach the negative electrode through the separator, forming reaction by-products, which will also cause the loss of active materials.

Method used

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  • Composite electrode and preparation method and application thereof
  • Composite electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Lithium iron phosphate and elemental sulfur were mixed at a ratio of 8:2 and ball milled at 300r / min for 3 hours to obtain product A. Take 0.1g of A, add 24.7mg of commercial KB carbon powder, mix evenly, and disperse in 1.3g of N-methylpyrrolidone ( NMP), after uniform dispersion, ultrasonic 20min, stirring for 1h, adding 0.132g 10wt% polyvinylidene fluoride (PVDF) solution, the solvent is NMP, stirring for 5h, adjusting the scraper to 200μm, scrape coating on the aluminum film to form a film , after overnight drying at 70°C, cut into small discs with a diameter of 14mm, weighed, and vacuum-dried at 60°C for 24 hours, then use this small disc as the positive electrode (the sulfur loading on a single piece is about 1 mg cm -2 ), lithium sheet as negative electrode, clegard 2325 as separator, 1M bis(trifluoromethylsulfonyl)imide lithium solution (LiTFSI) as electrolyte solution, solvent as 1,3-dioxolane (DOL) and ethylene dioxane A mixture of alcohol dimethyl ether (DME)...

Embodiment 2

[0036] Disperse the ternary material and elemental sulfur in the ethanol solution at a ratio of 5:5 (the amount of ethanol added is suitable for infiltrating the powder material), and ball mill at 300r / min for 5 hours to obtain product A. Take 0.1gA and add 24.7mg of commercial KB After the carbon powder is uniformly mixed, disperse in 1.3g of N-methylpyrrolidone (NMP). After the dispersion is uniform, ultrasonically for 20min, stir for 1h, add 0.132g of 10wt% polyvinylidene fluoride (PVDF) solution, the solvent is NMP, and stir for 5h , adjust the scraper to 200μm, scrape and coat on the aluminum film to form a film, dry it overnight at 70°C, cut it into a small disc with a diameter of 14mm, weigh it, and vacuum dry it at 60°C for 24h, then use this small disc as the positive electrode (Single-chip sulfur load is about 1mg cm -2 ), lithium sheet as negative electrode, clegard 2325 as separator, 1M bis(trifluoromethylsulfonyl)imide lithium solution (LiTFSI) as electrolyte solu...

Embodiment 3

[0038] Dissolve 0.35g of lithium sulfide in ethanol solution, add 0.15g of lithium ion battery positive electrode material, stir and mix for 3 hours, then dry the ethanol at 80°C to obtain the target product of ethanolization, put the powder in a tube furnace, Ar atmosphere , Calcined at 200°C for 1 h, the target product was obtained after removal of ethanol. Take 0.1g of the product, add 24.7mg of commercial KB carbon powder and mix evenly, then disperse in 1.3g of N-methylpyrrolidone (NMP). (PVDF) solution, the solvent is NMP, stirred for 5h, adjusted the scraper to 200μm, scraped on the aluminum film to form a film, dried overnight at 70°C, cut into small discs with a diameter of 14mm, weighed, vacuumed at 60°C After drying for 24 hours, the small disc was used as the positive electrode (the sulfur loading capacity of the single disc was about 1 mg cm -2 ), lithium sheet as negative electrode, clegard 2325 as separator, 1M bis(trifluoromethylsulfonyl)imide lithium solution...

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Abstract

The invention discloses a composite electrode material, a preparation method and an application thereof, applied to a lithium-sulfur battery, and aims to solve the technical problem of low discharging capacity of the existing lithium-sulfur battery. According to the technical scheme, a positive electrode material of a conventional lithium ion battery is compounded with active material sulfur or lithium sulfide to be used as the positive electrode material of the lithium-sulfur battery. In the electrode material, the positive electrode material of the lithium ion battery is uniformly filled with the active material sulfur or lithium sulfide; surface conductivity of lithium sulfide is induced based on changes of the surface microstructure of the positive electrode material of the lithium ion battery, so that reversibility of a redox reaction of lithium sulfide is improved and battery discharging capacity and cycling stability are improved; and meanwhile, a lithium ion intercalation and deintercalation process occurs under the interaction of the positive electrode material of the lithium ion battery and elemental sulfur, so that the discharging capacity of the lithium-sulfur battery is improved.

Description

technical field [0001] The invention relates to a composite electrode material, in particular to an electrode material applied to the positive electrode of a lithium-sulfur battery or a lithium-ion mixed lithium-sulfur battery. Background technique [0002] In recent years, with the decline of oil production and the intensification of global environmental pollution, countries around the world have generally recognized that clean and pollution-free electric vehicles to replace fuel vehicles is an inevitable choice for a country's sustainable development. The power battery technology with high specific capacity has become the key to the development of pure electric vehicles. At the same time, the rapid development of communication technology, space technology, and national defense industry has greatly promoted the demand for small-volume, high-capacity rechargeable batteries. At present, among the commercialized secondary batteries, the lithium-ion battery is currently the se...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5815H01M10/0525Y02E60/10
Inventor 王美日张华民张洪章冯凯杨晓飞李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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