Novel secondary battery cathode sulfur and selenium binary material and preparation method

A secondary battery and binary material technology, applied in the field of electrochemical batteries, can solve the problems of low utilization rate of sulfur cathode and poor cycle performance, and achieve good active material utilization rate, high specific capacity, and good cycle performance.

Inactive Publication Date: 2015-05-13
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the insulation of sulfur and its discharge product lithium sulfide, and the characteristics of a series of lithium polysulfide intermediates formed during charging and discharging are easily soluble in electrolyte, lithium-sulfur batteries have low utilization of sulfur cathodes and Poor cycle performance and other shortcomings, so it is difficult to practical use

Method used

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  • Novel secondary battery cathode sulfur and selenium binary material and preparation method
  • Novel secondary battery cathode sulfur and selenium binary material and preparation method
  • Novel secondary battery cathode sulfur and selenium binary material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 1.5g of selenium powder and 2.5g of sublimed sulfur respectively, mill them on a ball mill at a speed of 400r / min for 4h, then put them into a closed container, and carry out the sealing operation in a glove box filled with argon. Take out the closed container and put it in a muffle furnace for melting heat treatment: ① heat preservation at 150 °C for 1 hour; ② heat preservation at 230 °C for 1 hour; ③ heat preservation at 300 °C for 2 hours. During the heating process, it is guaranteed to shake several times to ensure the uniformity of the molten state. Finally, put it into ice water for rapid cooling to obtain the binary product. figure 1 is the resulting binary material Se 3 S 5 The XRD pattern is basically the same as the standard PDF card. Press Se 3 S 5 : Ketjen black=7:3 mass ratio mixed ball milling, and then heated at 160°C for 12 hours under argon protection in a tubular atmosphere furnace to obtain Se 3 S 5 / C Composite. Using N-methylpyrrolidon...

Embodiment 2

[0033]Weigh 1.0g of selenium powder and 2.0g of sublimed sulfur respectively, ball mill for 3h at a speed of 500r / min in a ball mill, then put them into a closed container, and carry out sealing operation in a glove box filled with argon. Take out the airtight container and put it in a muffle furnace for melting heat treatment: ① heat preservation at 160 °C for 0.5 hours; ② heat preservation at 250 °C for 2 hours; ③ heat preservation at 300 °C for 1 hour. During the heating process, it is guaranteed to shake several times to ensure the uniformity of the molten state. Finally, quickly put it into ice water for rapid cooling to obtain the product binary material SeS 2 . Press SeS 2 : Graphene = 3:1 mass ratio mixed ball mill, and then heated at 165°C for 10 hours in a tubular atmosphere furnace under the protection of nitrogen to obtain SeS 2 / C Composite. Using deionized water as solvent, the prepared SeS 2 / C composite material, Ketjen black and LA133 were mixed at a mass...

Embodiment 3

[0035] Weigh 2.5g of selenium powder and 1.5g of sublimed sulfur respectively, ball mill on a ball mill at a speed of 300r / min for 6h, then put the mixture into a closed container, and carry out the sealing operation in a glove box filled with argon. Take out the airtight container and put it in a muffle furnace for melting heat treatment: ① heat preservation at 149 °C for 1 hour; ② heat preservation at 230 °C for 1 hour; ③ heat preservation at 280 °C for 3 hours. During the heating process, it is guaranteed to shake several times to ensure the uniformity of the molten state. Finally, quickly put it into ice water for rapid cooling to obtain the product binary material Se 5 S 3 . Press Se 5 S 3 : carbon nanotubes = 3:2 mass ratio mixed ball milling, and then heated at 160°C for 8 hours under the protection of argon in a tubular atmosphere furnace to obtain Se 5 S 3 / C Composite. Using N-methylpyrrolidone as an organic solvent, the prepared Se 5 S 3 / C composite materi...

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Abstract

The invention relates to a novel secondary battery cathode sulfur and selenium binary material and a preparation method. The material is prepared from single elements sulfur and selenium by virtue of a certain heat treatment method and exists in the form of a solid solution with sulfur and selenium being inter-dissolved in any proportion. According to the sulfur and selenium binary material provided by the invention, compared with S, SexSy is relatively good in utilization rate of active substances and cycle performance; compared with Se, SexSy is relatively high in specific capacity. The sulfur and selenium binary material combines the advantages of the two materials, so that a synergistic effect is realized.

Description

(1) Technical field [0001] The invention belongs to the field of electrochemical batteries, and in particular relates to a novel secondary battery anode sulfur-selenium binary material and a preparation method. (2) Background technology [0002] The theoretical specific energy of lithium-sulfur batteries reaches 2600Wh / kg, which is much higher than LiCoO, a common cathode material for lithium-ion batteries. 2 , LiMnO 2 、LiFePO 4 capacity. In addition, lithium-sulfur batteries have the advantages of high specific capacity, no pollution, abundant resources and low price. Therefore, sulfur is a very attractive active material for secondary lithium batteries, especially in the direction of power vehicles, which has a good application prospect. However, limited by the insulation of sulfur and its discharge product lithium sulfide, and the characteristics of a series of lithium polysulfide intermediates formed during charging and discharging are easily soluble in electrolyte, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/136H01M4/1397
CPCH01M4/5815H01M10/052Y02E60/10
Inventor 王卓许寒雪杨晖陈欣王瑛赵成龙
Owner SHANDONG YUHUANG NEW ENERGY TECH
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