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Low-valence titanium sulfide as well as preparation method and application thereof

A low-valence, sulfide technology, used in titanium compounds, chemical instruments and methods, titanium sulfide, etc., to achieve the effects of reducing side reactions, excellent electrochemical performance, and high electrical conductivity

Active Publication Date: 2020-06-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there are few reports on the synthesis of single-phase low-valence titanium sulfides and their applications in Na-ion capacitors.

Method used

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  • Low-valence titanium sulfide as well as preparation method and application thereof
  • Low-valence titanium sulfide as well as preparation method and application thereof
  • Low-valence titanium sulfide as well as preparation method and application thereof

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preparation example Construction

[0040] figure 1 A schematic flow diagram of a preparation method of a low-valent titanium sulfide provided by the present invention, comprising the following steps:

[0041] (1) Preparation of TiS 2 Cathode: TiS 2 powder compression molding into flakes, and flake TiS 2 fixed to the current collector, resulting in TiS 2 cathode;

[0042] Preferably, TiS in step (1) 2 The dosage is 0.3~1.5g, and the molding pressure is 10~30MPa;

[0043] (2) Preparation of molten salt electrolyte: under the protection of an inert gas, first remove the water separation of the halogen salt, and then heat up to completely melt the halogen salt, thereby obtaining a molten salt electrolyte;

[0044] Preferably, the halogen salt in step (2) includes at least one of the following: calcium chloride, potassium chloride, lithium chloride, and sodium chloride, and the melting temperature of the halogen salt is 300-900°C.

[0045] (3) Preparation of low-valent titanium sulfide: the inert anode and th...

Embodiment 1

[0049] This embodiment includes the following steps:

[0050] (1) Add 0.5g of TiS 2 Press the pressure of 20MPa into a flake with a diameter of 10mm, and the flake TiS 2 Wrapped with molybdenum mesh and fixed on molybdenum wire, it is used as electrolysis cathode.

[0051] (2) Weigh 150g of lithium chloride molten salt and place it in a graphite crucible with a diameter of 400mm and a depth of 20cm, and heat it at 120°C, 250°C and 450°C for 5h to remove water, and then at a speed of 3°C / min The temperature is raised to 700°C until lithium chloride is completely melted, and as a molten salt electrolyte for electrolysis, the whole process is completed under the protection of an argon atmosphere.

[0052] (3) In order to remove impurities in the molten salt electrolyte, before the electrolysis experiment starts, the molten lithium chloride prepared by step (2) is Electrolyte, electrolysis at 2.6V for 10h. Then replace the molybdenum wire cathode with TiS 2 Cathode, continue ...

Embodiment 2

[0058] This embodiment includes the following steps:

[0059] (1) Add 0.5g of TiS 2 Press the pressure of 20MPa into a flake with a diameter of 10mm, and the flake TiS 2 Wrapped with molybdenum mesh and fixed on molybdenum wire as electrolysis cathode;

[0060] (2) Weigh 150g of lithium chloride molten salt and place it in a graphite crucible with a diameter of 400mm and a depth of 20cm, and heat it at 120°C, 250°C and 450°C for 5h to remove water, and then at a speed of 3°C / min Raise the temperature to 700°C until the lithium chloride is completely melted, as the molten electrolyte for electrolysis, and the whole process is completed under the protection of an argon atmosphere.

[0061] (3) In order to remove impurities in the molten salt electrolyte, before the electrolysis experiment starts, the molten lithium chloride prepared by step (2) is Electrolyte, electrolysis at 2.6V for 10h. Then replace the molybdenum wire cathode with TiS 2 Cathode, continue to prepare the ...

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Abstract

The invention discloses a low-valence titanium sulfide, a preparation method and an application thereof. The method comprises the steps that 1, a TiS2 cathode is prepared, specifically, TiS2 powder issubjected to compression molding to be in a sheet shape, the sheet-shaped TiS2 is fixed to a current collector, and therefore the TiS2 cathode is obtained; (2) a fused salt electrolyte is prepared: under the protection of inert gas, firstly water of haloid is removed, and then heating is carried out to completely melt the haloid so as to obtain the fused salt electrolyte; (3) low-valence titaniumsulfide is prepared: an inert anode and the TiS2 cathode prepared in the step (1) are put into the molten salt electrolyte prepared in the step (2), and an electrolytic tank is constructed; and the TiS2 on the TiS2 cathode is electrolyzed by controlling the electrolysis voltage and the electrolysis time, so that the low-valence titanium sulfide is obtained. According to the method, TiS2 is used as a raw material for preparing the TiS2 cathode, haloid is used for preparing the fused salt electrolyte, and the low-valence titanium sulfide with high conductivity is obtained by controlling the electrolysis voltage and the electrolysis time.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and more specifically relates to a low-valent titanium sulfide, a preparation method and an application thereof. Background technique [0002] At this stage, energy and environment are two main factors affecting the sustainable development of human society. In response to the depletion of fossil energy and environmental degradation, countries around the world are vigorously developing and establishing efficient, clean and renewable new energy (solar, wind and tidal energy, etc.) systems. As a simple and efficient energy storage technology, electrochemical capacitors play a vital role in new energy applications (such as large-scale energy storage power stations, mobile traffic power, and various portable electronic products). Compared with lithium-ion batteries, the most technologically mature and commercialized electrochemical energy storage systems, electrochemical capacitors h...

Claims

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Application Information

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IPC IPC(8): C25B1/00C01G23/00H01G11/06H01G11/30H01G11/86
CPCC01G23/007C25B1/00H01G11/06H01G11/30H01G11/86
Inventor 蒋凯陶宏伟周敏王康丽陈曼琳王如星李浩秒
Owner HUAZHONG UNIV OF SCI & TECH
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