Composite diaphragm for lithium-selenium battery and preparation method of composite diaphragm

A composite diaphragm and battery technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of reducing the selenium content in the selenium positive electrode and complex process, so as to eliminate surface passivation, increase discharge capacity, and improve utilization rate And the effect

Active Publication Date: 2015-05-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the research paper (J.Am.Chem.Soc., 2012,134,4505.), the preparation of carbon nanotube / selenium composite material is disclosed as the positive electrode material of lithium battery. It can show excellent electrochemical performance at low density, but the use of this material will reduce the content of selenium in the selenium positive electrode, and in this paper, the process of preparing selenium / carbon composite materials is complicated, and although the material can improve the selenium to a certain extent The utilization rate of active material selenium, but it failed to fundamentally solve the problem of "shuttle effect" of lithium-selenium batteries

Method used

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  • Composite diaphragm for lithium-selenium battery and preparation method of composite diaphragm

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Experimental program
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Effect test

Embodiment 1

[0034] 1) Preparation of titanium-based metal-organic framework:

[0035] Tetrabutyl titanate and terephthalic acid are added into a mixed solvent with a volume ratio of methanol and dimethylformamide of 1:9 in a ratio of 1:4 (mass ratio), wherein the concentration of titanium salt in the organic solvent is 0.075 mol L -1 , mixed evenly and then transferred to a polytetrafluoroethylene high-pressure reactor, heated to 150°C and kept at this temperature for 20h to carry out solvothermal reaction. Centrifugal filtration was carried out at a speed of min, washed alternately with methanol and deionized water three times, dried at 60°C, and then transferred to a vacuum oven at 180°C for activation for 72 hours, thereby obtaining a titanium-based metal-organic framework;

[0036] 2) Preparation of titanium dioxide / porous carbon composites:

[0037] Move the precursor titanium-based metal-organic framework prepared in step (1) to a tube furnace, and under the protection of an argon a...

Embodiment 2

[0045] 1) Preparation of titanium-based metal-organic framework:

[0046] Tetrabutyl titanate and 2-aminoterephthalic acid are added into a mixed solvent with a volume ratio of ethanol and dimethylformamide of 1:9 in a ratio of 1:2 (mass ratio), wherein the titanium salt is in an organic solvent The concentration is 0.1mol L -1 , mixed evenly and then transferred to a polytetrafluoroethylene high-pressure reactor, heated to 150°C and kept at this temperature for 20 hours to carry out solvothermal reaction. Centrifugal filtration was performed at a speed of 1 min, washed alternately with methanol and deionized water three times, dried at 60°C, and then transferred to a vacuum oven at 200°C for activation for 36 hours, thereby obtaining a titanium-based metal-organic framework;

[0047] 2) Preparation of titanium dioxide / porous carbon composites:

[0048] Move the precursor titanium-based metal-organic framework prepared in step (1) to a tube furnace, and under the protection ...

Embodiment 3

[0052] 1) Preparation of titanium-based metal-organic framework:

[0053] Tetrabutyl titanate and mellitic acid are added in the N-formyl amide solvent in a ratio of 2:3 (mass ratio), wherein the concentration of titanium salt in the organic solvent is 0.15mol L -1 , mixed evenly and then transferred to a polytetrafluoroethylene high-pressure reactor, heated to 160°C and kept at this temperature for 18 hours to carry out solvothermal reaction. Centrifugal filtration was carried out at a speed of 1 min, washed alternately with methanol and deionized water three times, dried at 60°C, and then transferred to a vacuum oven at 200°C for activation for 72 hours, thereby obtaining a titanium-based metal-organic framework;

[0054] 2) Preparation of titanium dioxide / porous carbon composites:

[0055] Move the precursor titanium-based metal-organic framework prepared in step (1) to a tube furnace, and under the protection of an argon atmosphere, heat it from room temperature to 600 °C...

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Abstract

The invention discloses a composite diaphragm for a lithium-selenium battery and a preparation method of the composite diaphragm. The composite diaphragm is formed by smearing a coating material on an original diaphragm basal body, wherein the coating material consists of a titanium dioxide/porous carbon composite material, a conducting agent and a binder, and the titanium dioxide/porous carbon composite material is prepared by adopting a titanium-based metal organic framework as a precursor in a high-temperature carbonization manner. By adopting the composite diaphragm disclosed by the invention, a shuttle effect of poly-selenium ions generated in the charging and discharging process of the lithium-selenium battery between a selenium positive electrode and a lithium negative electrode can be effectively inhibited, and the cycling performance and the rate capability of the lithium-selenium battery can be remarkably improved. The preparation method is simple to operate, the composite diaphragm is low in cost and high in application potential and commercial value, and industrial implementation and mass production can be realized easily.

Description

technical field [0001] The invention belongs to the field of lithium-selenium battery systems, and in particular relates to a composite separator for lithium-selenium batteries and a preparation method thereof. Background technique [0002] Lithium-selenium battery is a lithium-ion secondary battery system with high energy density, which is currently being jointly developed by academia and industry. Lithium-selenium battery refers to a type of metal lithium secondary battery that uses elemental selenium or selenium-containing compounds as the positive electrode and metallic lithium as the negative electrode, and realizes the mutual conversion between chemical energy and electrical energy through the chemical reaction between selenium and lithium. [0003] As selenium of the same main group as sulfur, because of its two-electron reaction, high lithiation potential and high density in the electrochemical reaction process, it has a high theoretical volume specific capacity. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/446H01M50/449
CPCY02E60/10
Inventor 张治安甘永青陈巍赖延清李劼
Owner CENT SOUTH UNIV
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