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Selenium-rich lithium selenium battery based on three-dimensional ordered porous carbon optical crystal and preparation method of selenium-rich lithium selenium battery

A three-dimensional ordered, porous carbon technology, used in lithium batteries, electrolyte battery manufacturing, battery electrodes, etc., can solve problems such as cracks and poor order of photonic crystals, and achieve the effects of simple process, improved electrical conductivity, and extended cycle performance.

Pending Publication Date: 2022-04-29
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0006] 2) The spraying method is used to prepare large-area photonic crystals. Due to the fast drying process, the order of the prepared photonic crystals is poor, and after drying, obvious cracks will occur due to surface tension.

Method used

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  • Selenium-rich lithium selenium battery based on three-dimensional ordered porous carbon optical crystal and preparation method of selenium-rich lithium selenium battery
  • Selenium-rich lithium selenium battery based on three-dimensional ordered porous carbon optical crystal and preparation method of selenium-rich lithium selenium battery
  • Selenium-rich lithium selenium battery based on three-dimensional ordered porous carbon optical crystal and preparation method of selenium-rich lithium selenium battery

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preparation example Construction

[0043] A method for preparing a selenium-rich lithium-selenium battery based on a three-dimensional ordered porous carbon crystal, characterized in that the method comprises the following steps:

[0044] (1) Preparation of selenium-enriched sulfur selenide

[0045] (1.1) Mix selenium powder and a small amount of sulfur powder according to the mass ratio of sulfur powder: selenium powder 0.05-0.2: 0.95-0.8, grind, seal in a glass tube, and then heat-treat in a tube furnace at 220°C-280°C for 1h -12h.

[0046] (2) Preparation of microsphere photonic crystals

[0047] (2.1) Disperse silicon oxide microspheres of a certain size into a solvent, ultrasonicate for a certain period of time, and prepare a solution with a mass concentration of 0.1%-10%; the particle size of the monodisperse microspheres in the solution is 100nm-1000nm;

[0048] (2.2) Pour the microsphere solution into a container for vacuum filtration, and filter for 10min-2h to prepare microsphere photonic crystals w...

Embodiment 1

[0060] Sulfur powder and selenium powder with a molar mass ratio of 10% and 90% were mixed and ground, sealed in a glass tube, and then transferred to a tube furnace for 3 hours at 260°C to obtain selenium-enriched sulfoselenide. Add the silicon dioxide microsphere alcohol solution with a mass concentration of 2% and a diameter of 200 nm into a suction filter bottle, and perform vacuum filtration for 30 minutes to obtain microsphere photonic crystals with a certain thickness. 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 microsphere photonic crystals were removed from the filter paper, immersed in the metal frame organic compound precursor solution for 1 h, and then moved to a dry oven at 70°C for 6 h to form a composite of silicon dioxide and metal frame organic compounds. The composite was moved to a tube furnace for heat treatment at 800°C for 3h...

Embodiment 2

[0064] Sulfur powder and selenium powder with a molar mass ratio of 5% and 95% were mixed and ground, sealed in a glass tube, and then transferred to a tube furnace for 3 hours at 270°C to obtain selenium-enriched sulfoselenide. Add the silicon dioxide microsphere alcohol solution with a mass concentration of 0.5% and a diameter of 300 nm into a suction filter bottle, and perform vacuum filtration for 60 minutes to obtain microsphere photonic crystals with a certain thickness. 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 microsphere photonic crystals were removed from the filter paper, immersed in the metal frame organic compound precursor solution for 1 h, and then moved to a dry oven at 90 ° C for 3 h to form a composite of silicon dioxide and metal frame organic compounds. The composite was transferred to a tube furnace for heat treatment at 900...

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Abstract

The invention relates to a selenium-rich lithium selenium battery based on three-dimensional ordered porous carbon optical crystal and a preparation method thereof, on one hand, trace sulfur is doped in selenium simple substance, and selenium-rich sulfur selenide is synthesized as a battery active material; on the other hand, a silicon dioxide colloidal crystal template is synthesized through a vacuum filtration method, a metal organic framework compound is synthesized in gaps of the template, a silicon dioxide and ordered porous carbon compound is formed through high-temperature carbonization, and the three-dimensional ordered graded porous nitrogen-doped carbon photonic crystal is obtained after the silicon dioxide opal template is removed. The selenium-rich sulfur selenide and the nitrogen-doped carbon photonic crystal are compounded to serve as a positive electrode material of the lithium-selenium battery, and lithium metal serves as a counter electrode to prepare the lithium-selenium battery. Compared with the prior art, the lithium-selenium battery with high specific capacity, high rate capability and long cycle life is obtained.

Description

technical field [0001] The invention relates to materials and preparation methods in the technical field of lithium batteries, in particular to a selenium-enriched lithium-selenium battery based on three-dimensional ordered porous carbon crystals and a preparation method thereof. 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, since lithium-ion batteries are based on the reaction mechanism of lithium-ion intercalation and delithiation in the gaps of the molecular structure of electrode materials, its theoretical specific capacity and energy density are limited, which cannot meet the needs of high-power equipment suc...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M10/058H01M4/62
CPCH01M10/052H01M10/058H01M4/625Y02P70/50
Inventor 胡晓斌林升炫肖佳佳
Owner SHANGHAI JIAO TONG UNIV
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