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Preparation method of positive electrode of transition metal doped antimonene composite lithium-sulfur battery

A transition metal and composite electrode technology, which is applied in the direction of lithium batteries, battery electrodes, metal processing equipment, etc., can solve problems such as shedding, achieve the effects of preventing dissolution and diffusion, improving volume expansion effect, and stabilizing structure

Active Publication Date: 2022-03-22
东方电气集团科学技术研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above method only solves the dissolution and diffusion of polysulfide compounds from the perspective of physical confinement. It is difficult to form a strong chemical bond between the surface of the electrode material and the sulfur. Will still fall off the current collector due to the change in electrode volume

Method used

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  • Preparation method of positive electrode of transition metal doped antimonene composite lithium-sulfur battery
  • Preparation method of positive electrode of transition metal doped antimonene composite lithium-sulfur battery
  • Preparation method of positive electrode of transition metal doped antimonene composite lithium-sulfur battery

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Embodiment 1

[0036] A method for preparing a positive electrode of a transition metal-doped antimonene composite lithium-sulfur battery, comprising the following steps:

[0037] S1. Synthesis of Antimonene

[0038] Put metal antimony crystals into a mortar, add ethanol and isopropanol mixed solvent (ethanol: isopropanol = 1:2), and grind in the same direction. After grinding for 2-12 hours, grind the After the mixture is poured into a cup, the cup is placed in an ultrasonic instrument for ultrasonication. After ultrasonication for 2-14 hours, the mixture is centrifuged to obtain several layers of antimonene. Wherein, the centrifugal speed of centrifugal separation is 5000-15000 rpm, and the obtained antimonene has 10-100 layers and a thickness of 2-10 nm.

[0039] S2. Preparation of antimonene transition metal composite electrode

[0040] Under alkaline conditions with a pH value of 9-10, mix the antimonene material obtained in step S1 with metal cobalt Co in a nickel boat, and place it ...

Embodiment 2

[0046] A method for preparing a positive electrode of a transition metal-doped antimonene composite lithium-sulfur battery, comprising the following steps:

[0047] S1. Synthesis of Antimonene

[0048] Put metal antimony crystals into a mortar, add ethanol and isopropanol mixed solvent (ethanol: isopropanol = 1:2), and grind in the same direction. After grinding for 2-12 hours, grind the After the mixture is poured into a cup, the cup is placed in an ultrasonic instrument for ultrasonication. After ultrasonication for 2-14 hours, the mixture is centrifuged to obtain several layers of antimonene. Wherein, the centrifugal speed of centrifugal separation is 5000-15000 rpm, and the obtained antimonene has 10-100 layers and a thickness of 2-10 nm.

[0049] S2. Preparation of antimonene transition metal composite electrode

[0050] Under alkaline conditions with a pH value of 9-10, mix the antimonene material obtained in step S1 with metal zinc Zn in a nickel boat, and place it in...

Embodiment 3

[0057] A method for preparing a positive electrode of a transition metal-doped antimonene composite lithium-sulfur battery, comprising the following steps:

[0058] S1. Synthesis of Antimonene

[0059] Put metal antimony crystals into a mortar, add ethanol and isopropanol mixed solvent (ethanol: isopropanol = 1:2), and grind in the same direction. After grinding for 2-12 hours, grind the After the mixture is poured into a cup, the cup is placed in an ultrasonic instrument for ultrasonication. After ultrasonication for 2-14 hours, the mixture is centrifuged to obtain several layers of antimonene. Wherein, the centrifugal speed of centrifugal separation is 5000-15000 rpm, and the obtained antimonene has 10-100 layers and a thickness of 2-10 nm.

[0060] S2. Preparation of antimonene transition metal composite electrode

[0061] Under alkaline conditions with a pH value of 9-10, mix the antimonene material obtained in step S1 with metal chromium Cr in a nickel boat, and place i...

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Abstract

The invention discloses a preparation method of a positive electrode of a transition metal doped antimonene composite lithium-sulfur battery, and relates to the technical field of lithium-sulfur battery preparation, and the preparation method comprises the steps of antimonene synthesis, antimonene transition metal composite electrode preparation, hard carbon coated core-shell composite sulfur electrode material preparation and antimonene transition metal composite sulfur positive electrode preparation. A metal compound with good conductivity is formed by doping antimonene with transition metal, so that the conductivity of the sulfur electrode is improved, sulfide is captured by utilizing the special vacancy defect and wider band gap of two-dimensional lamellar antimonene, and the problem of dissolution diffusibility of polysulfide is solved; an antimonene transition metal compound is used as a carrier, sulfur with a hard carbon coated core-shell structure is loaded on a metal composite substrate, the antimonene / carbon coated composite sulfur electrode is prepared, the large interlayer spacing of hard carbon can buffer the volume expansion of sulfide in the charge-discharge cycle process of a lithium-sulfur battery, and the stability of the lithium-sulfur battery is improved. The purposes of improving the actual capacity of the lithium-sulfur battery and prolonging the cycle life of the lithium-sulfur battery are achieved.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur battery preparation, in particular to a method for preparing a positive electrode of a transition metal-doped antimonene composite lithium-sulfur battery. Background technique [0002] Lithium-sulfur battery is a type of lithium battery, which uses sulfur as the positive electrode of the battery and metal lithium as the negative electrode. Elemental sulfur is abundant in the earth, its price is low, and it is an environmentally friendly element that basically has no pollution to the environment, so it is a very promising lithium battery material. [0003] Due to its high theoretical specific capacity (1672mAh / g), energy density, and power density, lithium-sulfur batteries are considered to be the most promising high-energy batteries for the next generation, and have gradually become the focus of research. The theoretical specific energy of lithium-sulfur batteries is 2567Wh / g, which is muc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62B22F1/068B22F9/04C01B17/02C01B32/05C01G9/03C01G15/00C01G37/02C01G45/02C01G51/04
CPCH01M4/366H01M4/38H01M4/583H01M4/624H01M10/052B22F9/04C01G51/04C01B32/05C01B17/0248C01G9/03C01G37/02C01G45/02C01G15/00H01M2004/028C01P2004/80C01P2006/40Y02E60/10
Inventor 黄兴兰张中伟候小宝阮晓莉阴宛珊
Owner 东方电气集团科学技术研究院有限公司
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