High-performance sulfenyl composite anode material and preparation method thereof

A composite positive electrode material and composite material technology, applied in the field of high-performance sulfur-based composite positive electrode material and its preparation, can solve the problems of poor cycle life, low electrode activity, low electrical conductivity, etc., and achieve low cost, low specific surface area, thermal good stability

Active Publication Date: 2018-09-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide a high-performance sulfur-based composite positive electrode material and a preparation method thereof, wherein the sulfur-based composite positive electrode material is prepared with corresponding components and corresponding proportions. The overall flow process setting of the method and the reaction parameter conditions (such as processing temperature, processing time, etc.) The problem of low electrode activity and poor cycle life caused by the dissolution and diffusion of sulfide; and the lithium-sulfur battery formed by the sulfur-based composite positive electrode material as the positive electrode assembly also has the characteristics of high cycle times, good capacity stability and long service life

Method used

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  • High-performance sulfenyl composite anode material and preparation method thereof
  • High-performance sulfenyl composite anode material and preparation method thereof
  • High-performance sulfenyl composite anode material and preparation method thereof

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Embodiment 1

[0023] The selenium element, the sulfur element and the conductive polymer are uniformly mixed according to the mass ratio of 20P 80 (10Se 90S) (the mass percentage of the conductive polymer in the mixture is 20%, the mass percentage of the selenium element is 8%, and the sulfur The mass percentage of the simple substance is 72%), heat treatment at 220° C. for 10 h under a vacuum-sealed condition, to fully react sulfur, selenium and conductive polymer, and obtain a precursor. Then, the precursor was treated at 300°C for 4 hours in an argon or nitrogen atmosphere to promote dehydrogenation of the polymer, and volatilize and remove S that was not recombined with the polymer chain to obtain a sulfur-based composite cathode material. According to its BET results, its specific surface area is 18m 3 / g( figure 1 ).

[0024] The above-mentioned sulfur-based composite positive electrode material, acetylene black conductive agent, and SBR adhesive are mixed evenly at a mass ratio of ...

Embodiment 2

[0026] The selenium element, the sulfur element and the conductive polymer were uniformly mixed at a mass ratio of 65P·35(2Se·98S), and heat-treated at 250°C for 12 hours in a vacuum-sealed condition to fully react the sulfur, selenium and the conductive polymer to obtain a precursor. Then, the precursor was treated at 350°C for 10 hours under an argon or nitrogen atmosphere to promote dehydrogenation of the polymer, and volatilize and remove the S that was not recombined with the polymer chain to obtain a sulfur-based composite cathode material.

Embodiment 3

[0028] The selenium element, the sulfur element and the conductive polymer were uniformly mixed at a mass ratio of 50P·50(5Se·95S), and heat-treated at 280°C for 16 hours in a vacuum-sealed condition to fully react the sulfur, selenium and the conductive polymer to obtain a precursor. Then, the precursor was treated at 400°C for 6 hours under an argon or nitrogen atmosphere to promote dehydrogenation of the polymer, and volatilize and remove S that was not recombined with the polymer chain to obtain a sulfur-based composite cathode material.

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Abstract

The invention discloses a high-performance sulfenyl composite anode material and a preparation method thereof. The composite material is formed by compounding a conductive polymer with M-doped sulfur,and is xP.{(1-x)[yM.(1-y)S]} particularly, wherein P stands for the conductive polymer, S is sulfur, M is one or two of Se and Te, x and (1-x) are separately the mass percent of the conductive polymer and the mass percent of the M-doped sulfur, y and (1-y) are separately the mass percent of M in the M-doped sulfur and the mass percent of sulfur, 0<x<1, and 0<y<1. The high-performance sulfenyl composite anode material can be obtained by modifying and further optimizing various components in the sulfenyl composite anode material and the corresponding ratios, the corresponding preparation methods and the like, and the problems that in the prior art, the electrical conductivity is low, and the activity of an electrode is low and the cycle life is poor due to solubility and diffusion of polysulfide are solved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and more specifically relates to a high-performance sulfur-based composite cathode material and a preparation method thereof. Background technique [0002] Batteries are an indispensable device in contemporary society. From portable electronic products such as mobile phones, to electric vehicles and aerospace vehicles, to the utilization of renewable energy, batteries are playing an irreplaceable role as energy storage and conversion devices. Compared with other commonly used secondary batteries, lithium-ion batteries have attracted extensive attention because of their high mass-specific energy and volume-specific energy. Low cost, high energy density, high safety, long cycle life, and green secondary batteries are the hotspots in the development of next-generation lithium batteries. [0003] Elemental sulfur is used as the positive electrode material, and metal lithium is used as the negativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5815H01M4/624Y02E60/10
Inventor 谢佳袁利霞孙玉龙陈新彭林峰
Owner HUAZHONG UNIV OF SCI & TECH
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