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Preparation method of carbon-coated nitride porous ceramic

A technology of porous ceramics and oxide ceramics, applied in ceramic products, applications, electrical components, etc., can solve the problems of short battery life, poor long-term cycle performance and poor rate performance of lithium-sulfur batteries

Pending Publication Date: 2021-09-14
NANJING UNIV OF POSTS & TELECOMM +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method for preparing a carbon-coated nitride porous ceramic sulfur-containing electrode, which utilizes the excellent electron transport capability, firm macro-microstructure, and stable The chemical properties of lithium-sulfur batteries effectively solve the problem of poor rate performance of lithium-sulfur batteries, and solve the problems of poor long-term cycle performance and short battery life of lithium-sulfur batteries by improving the way of sulfur fixation and carbon coating on the ceramic surface

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  • Preparation method of carbon-coated nitride porous ceramic

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Embodiment 1

[0033] (1) Preparation of titanium nitride porous ceramic sheet

[0034] First, titanium oxide powder, nano-carbon black, binder, pore-forming agent and other powders are prepared as raw materials according to the mass ratio of 8:1:0.5:0.5; then, under Ar atmosphere, cemented carbide balls are used as grinding balls, The ratio of ball to material is 10:1, the stainless steel tank is a ball mill tank, and the ball mill is rolled and mixed at a speed of 500r / min on the ball mill. After a period of 6 hours of ball milling, titanium oxide ceramic powder is obtained; the obtained titanium oxide ceramic powder is obtained Placed in a cemented carbide steel mold with a diameter of 14mm, the titanium oxide green body made by powder compression method, the compression pressure is 10 Mpa / cm 2 Put the obtained titanium oxide green body in a tube furnace, and carry out pressureless sintering at 950, 1000, and 1100° C. respectively under the atmosphere of an ammonia-nitrogen mixer to obtai...

Embodiment 2

[0046] (1) Preparation of titanium nitride porous ceramic sheet

[0047] First, titanium oxide powder, nano-carbon black, binder, pore-forming agent and other powders are prepared as raw materials according to the mass ratio of 7:2:0.5:0.5; then, under Ar atmosphere, cemented carbide balls are used as grinding balls, The ratio of ball to material is 10:1, the stainless steel tank is a ball mill tank, and the ball mill is rolled and mixed at a speed of 500r / min on the ball mill. After a period of 6 hours of ball milling, titanium oxide ceramic powder is obtained; the obtained titanium oxide ceramic powder is obtained Placed in a rectangular cemented carbide steel mold with a length and width of 3*4 cm, the titanium oxide green body is made by powder pressing, and the pressing pressure is 10 Mpa / cm 2 ; Place the obtained titanium oxide green body in a tube furnace, and perform pressureless sintering at 1000° C. in an ammonia-nitrogen mixer atmosphere to obtain titanium nitride p...

Embodiment 3

[0053] (1) Preparation of titanium nitride porous ceramic sheet

[0054] First, titanium oxide powder, nano-carbon black, binder, pore-forming agent and other powders are prepared as raw materials according to the mass ratio of 8:1:0.5:0.5; then, under Ar atmosphere, cemented carbide balls are used as grinding balls, The ball-to-material ratio is 15:1, the stainless steel tank is a ball mill tank, and the ball mill is rolled and mixed at a speed of 600r / min on the ball mill. After a period of 12 hours of ball milling, titanium oxide ceramic powder is obtained; the obtained titanium oxide ceramic powder is obtained Placed in a cemented carbide steel mold with a diameter of 60 mm, the titanium oxide green body is made by powder pressing, and the pressing pressure is 20 Mpa / cm 2 ; Place the obtained titanium oxide green body in a tube furnace, and perform pressureless sintering at 900° C. under an ammonia-nitrogen mixer atmosphere to obtain titanium nitride porous ceramics;

[0...

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Abstract

The invention provides a method for preparing carbon-coated nitride porous ceramic through arc discharge plasma magnetic filtration vapor deposition , belonging to the technical field of preparation of lithium-sulfur battery electrode materials. The method comprises the following steps: ball-milling and mixing titanium oxide powder, nanometer carbon black, a binder, a pore-forming agent and other powder with a ball mill; preparing a green body of an oxide porous ceramic by using a powder tabletting method via a tablet press; placing the green body in a tubular furnace for high-temperature-atmosphere sintering to obtain nitride porous ceramic; placing the nitride porous ceramic in a chemical vapor co-deposition device, and depositing S in a pore structure of the nitride porous ceramic to obtain a nitride porous ceramic sulfur-containing electrode; and finally, combining arc discharge plasma magnetic filtering vapor deposition with a solid source, coating the surface of the sulfur-containing nitride porous ceramic sulfur-containing electrode with a layer of carbon so as to prepare the carbon-coated nitride porous ceramic sulfur-containing electrode. According to the invention, nitride in the structure serves as a conductive framework, so the structural stability and the conductivity of a sulfur-containing carrier can be improved, and the nitride has excellent conversion and adsorption performance on polysulfide. Particularly, carbon coating is carried out on the surface of the nitride porous ceramic sulfur-containing electrode, so the shuttle effect of polysulfide can be further inhibited, and remarkable effects on improving the S content of a lithium-sulfur battery, prolonging the cycle life of the battery and the like are achieved.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous conductive ceramics, and in particular relates to a preparation method of a carbon-coated nitride porous ceramic sulfur-containing electrode. Background technique [0002] The rapid development of various electronic products has brought great convenience to our lives. At the same time, the market demand for commercial lithium-ion batteries, which are the main power supply for battery products, is also gradually increasing. The global market size of lithium-ion batteries reached the billion level. In response to the current market demand, there is an urgent need for a lithium-ion battery that is smaller, lighter and thinner, and has a higher energy density. g) and specific energy (2600Wh / kg) have attracted more and more scientific research. As far as the current research progress is concerned, while lithium-sulfur batteries have high energy density, there are many problems that affe...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B41/89H01M4/36H01M4/38H01M4/583H01M10/052C04B38/02
CPCC04B35/58C04B35/58014C04B35/58007C04B35/58042C04B41/89C04B41/52C04B41/009H01M4/366H01M4/38H01M4/583H01M10/052C04B38/02C04B2235/3232C04B2235/3237C04B2235/3239C04B2235/3258C04B2235/3277C04B2235/465C04B2235/46C04B41/5097C04B41/4531C04B41/5001Y02E60/10
Inventor 王成陈子博何倩韩旭然焦云飞吴强张婷刘瑞卿应世强李谊马延文
Owner NANJING UNIV OF POSTS & TELECOMM
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