Lithium-sulfur battery positive pole material and preparation method thereof

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of complex process, large proportion of inactive substances, and micro-precision control unfavorable for large-scale production, etc. Achieve the effect of low cost, high specific capacity and stable electrochemical cycle performance

Inactive Publication Date: 2016-08-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

QingZhao et al. used electrochemical deposition to prepare sulfur nanodots on nickel foam as anode materials for lithium-sulfur batteries to improve the performance of lithium-sulfur batteries (QingZhao, et al. The process is complicated, and the proportion of inactive substances is large
Liwei Chen et al. prepared monodispersed sulfur nanodots by using the chemical action of thiamine, but the precise control of the micro amount is not conducive to large-scale production (Hongwei Chen, et al. Monodispersed Sulfur Nanoparticles for Lithium-Sulfur Batteries with Theoretical Performance. NanoLett. 2015, 15, 798–802.)

Method used

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  • Lithium-sulfur battery positive pole material and preparation method thereof
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  • Lithium-sulfur battery positive pole material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] (1) 1.15g zinc and 3.9g sucrose are mixed and ball milled, the ball-to-material ratio is 10:1, and the rotating speed is 300rpm, and the ball mill is 6h, and the resulting mixture is sealed in a stainless steel autoclave in a glove box full of an inert gas, and then the The autoclave was evacuated to below 0.1MPa; the autoclave was heated to 550°C with an electric furnace, and after 8 hours of reaction, it was naturally cooled to room temperature to obtain the reaction product, and the loose part of the upper layer of the reaction product was ball milled at a speed of 300rpm for 6 hours. The obtained material was first washed with dilute hydrochloric acid with a concentration of 0.1M until no bubbles were generated, then washed with deionized water until the pH was neutral, and dried at 100°C for 10 hours to obtain porous nanocarbon flakes; the porous nanocarbon flakes and sulfur The simple substances are mixed and ball milled at a mass ratio of 1:4, the ball to material...

Embodiment 2

[0065] (1) 1.15g magnesium and 3.9g sucrose are mixed and ball-milled, the ball-to-material ratio is 10:1, the rotating speed is 300rpm, and the ball mill is 6h. The resulting mixture is sealed in a stainless steel autoclave in a glove box full of inert gas, and then the high-pressure The autoclave was evacuated to below 0.1MPa; the autoclave was heated to 550°C with an electric furnace, and after 8 hours of reaction, it was naturally cooled to room temperature to obtain the reaction product, and the loose part of the upper layer of the reaction product was ball milled at a speed of 300rpm for 6 hours, and obtained after ball milling The substance was first washed with dilute hydrochloric acid with a concentration of 0.1M until no bubbles were generated, then washed with deionized water until the pH was neutral, and dried at 100°C for 10 hours to obtain porous nanocarbon flakes; the porous nanocarbon flakes and sulfur element According to the mass ratio of 1:4, ball milling is ...

Embodiment 3

[0078] (1) 1.15g zinc and 3.9g glucose are mixed ball milled, the ball-to-material ratio is 10:1, the rotating speed is 300rpm, ball milled for 6h, the resulting mixture is sealed in a stainless steel autoclave in a glove box full of inert gas, and then the The autoclave was evacuated to below 0.1MPa; the autoclave was heated to 550°C with an electric furnace, and after 8 hours of reaction, it was naturally cooled to room temperature to obtain the reaction product, and the loose part of the upper layer of the reaction product was ball milled at a speed of 300rpm for 6 hours. The obtained material was first washed with dilute hydrochloric acid with a concentration of 0.1M until no bubbles were generated, then washed with deionized water until the pH was neutral, and dried at 100°C for 10 hours to obtain porous nanocarbon flakes; the porous nanocarbon flakes and sulfur The simple substances are mixed and ball-milled according to the mass ratio of 1:4, the ball-to-material ratio i...

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Abstract

The invention relates to a lithium-sulfur battery positive pole material and a preparation method thereof, and belongs to the technical field of battery materials. The provided positive pole material has abundant micropores and mesopores; porous nano carbon thin sheets with a three-dimensional communicated net structure are taken as the skeleton; nano sulfur dots are filled into the pores of the net structure, and the outer layer of the skeleton is wrapped by reduced oxidized graphene. The preparation method comprises the following steps: mixing porous nano carbon thin sheets with a sulfur single substance, subjecting the mixture to ball milling, carrying out reactions at a temperature of 180 to 200 DEG C in an enclosed environment in the absence of oxygen and water under the protection of inert gas to obtain a porous nano carbon thin sheet/nano sulfur compound; dissolving the compound into an ethanol solution, dispersing the compound by ultrasonic waves, adding oxidized graphene, adjusting the pH to 10.1 by ammonia water, carrying out ultrasonic dispersion, carrying out hydrothermal reactions at a temperature of 80 to 100 DEG C, filtering, washing the reaction product until the reaction product becomes neutral, and drying to obtain the positive pole material. The positive material has the advantages of high specific capacity and stable electrochemical circulation performance, moreover, the preparation method is simple, the price is low, and the positive material is environment-friendly and can be easily produced in batches.

Description

technical field [0001] The invention relates to a lithium-sulfur battery cathode material and a preparation method thereof, belonging to the technical field of battery materials. Background technique [0002] With the continuous advancement of new energy and green science and technology and the increasing demand for power batteries and mobile power equipment, research and development of environmentally friendly secondary batteries with long cycle life and high specific capacity has become more and more meaningful. Due to the advantages of high energy density, long life and no memory effect, lithium-ion secondary batteries have become the preferred power source for various electronic products. With the further miniaturization of electronic equipment and the rapid development of electric vehicles and large-scale energy storage power stations, people have put forward higher requirements for their power supplies. Existing lithium-ion batteries are difficult to meet people's nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/587H01M4/625H01M10/052Y02E60/10
Inventor 吴锋陈人杰叶玉胜薛晴钱骥赵腾李丽
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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