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A kind of composite diaphragm for lithium selenium battery and preparation method thereof

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 complicated process, so as to eliminate surface passivation, increase discharge capacity, and improve cycle performance and the effect of rate performance

Active Publication Date: 2017-02-01
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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  • A kind of composite diaphragm for lithium selenium battery and preparation method thereof
  • A kind of composite diaphragm for lithium selenium battery and preparation method thereof
  • A kind of composite diaphragm for lithium selenium battery and preparation method thereof

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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 in a 1:4 ratio (substance amount ratio) into a mixed solvent with a volume ratio of methanol and dimethylformamide of 1:9, and the concentration of titanium salt in the organic solvent is 0.075 mol L -1 After mixing uniformly, transfer to a polytetrafluoroethylene autoclave, heat up to 150°C and keep it at this temperature for 20h for solvothermal reaction. After the reaction, cool to room temperature at a temperature drop rate of 1°C / min at 10 000r Centrifugal filtration at speed per minute, alternating washing with methanol and deionized water 3 times, drying at 60°C, and transferring to a vacuum drying oven at 180°C for 72h activation, thereby obtaining a titanium-based metal organic framework;

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

[0037] The precursor titanium-based metal-organic framework prepared in step (1) was...

Embodiment 2

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

[0046] Tetrabutyl titanate and 2-aminoterephthalic acid are added in a 1:2 ratio (substance amount ratio) into a mixed solvent with a volume ratio of ethanol and dimethylformamide of 1:9, where the titanium salt is in the organic solvent The concentration is 0.1mol L -1 After mixing uniformly, transfer to a polytetrafluoroethylene autoclave, heat up to 150°C and keep it at this temperature for 20h for solvothermal reaction. After the reaction, cool to room temperature at a rate of 1°C / min at a temperature of 8 000r Centrifugal filtration at speed per minute, alternating washing with methanol and deionized water 3 times, drying at 60°C, and transferring to 200°C vacuum drying oven for 36h activation, thereby obtaining titanium-based metal organic framework;

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

[0048] The precursor titanium-based metal organic framework prepared in step (1) is...

Embodiment 3

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

[0053] Tetrabutyl titanate and trimellitic acid are added to N-formylamide solvent in a ratio of 2:3 (substance amount ratio), and the concentration of titanium salt in the organic solvent is 0.15 mol L -1 After mixing uniformly, transfer to a polytetrafluoroethylene autoclave, heat up to 160°C and keep it at this temperature for 18h for solvothermal reaction. After the reaction, cool to room temperature at a rate of 1°C / min at a rate of 10000r / Centrifugal filtration at min speed, alternating washing with methanol and deionized water 3 times, drying at 60°C, and transferring to 200°C vacuum drying oven for 72h activation, thereby obtaining titanium-based metal organic framework;

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

[0055] The precursor titanium-based metal-organic framework prepared in step (1) is moved to a tube furnace, and heated from room temperature to 600°C at a heatin...

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Abstract

The invention discloses a composite diaphragm for a lithium-selenium battery and a preparation method thereof. The composite diaphragm involved in the present invention is obtained by coating the original diaphragm matrix with the coating material, and the coating material is composed of titanium dioxide / porous carbon composite material, conductive agent and binder, wherein the titanium dioxide / porous carbon composite material is made of titanium base Metal-organic frameworks are obtained by high-temperature carbonization of precursors. The composite separator involved in the invention can effectively inhibit the shuttle effect of polyselenium ions generated during the charging and discharging process of the lithium-selenium battery between the selenium positive electrode and the lithium negative electrode, thereby significantly improving the cycle performance and rate performance of the lithium-selenium battery. Moreover, the preparation method of the present invention is simple in operation, low in cost, has strong application potential and commercial value, and is easy to be implemented in industry and produced in large quantities.

Description

Technical field [0001] The invention belongs to the field of lithium-selenium battery systems, and specifically relates to a composite diaphragm for a lithium-selenium battery and a preparation method thereof. Background technique [0002] Lithium-selenium battery is a lithium-ion secondary battery system with high energy density. At present, academia and industry are working together to develop this battery system. 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 metal lithium as the negative electrode, through the chemical reaction between selenium and lithium to achieve mutual conversion between chemical energy and electrical energy. [0003] As the same main group as sulfur, selenium has a high theoretical volume specific capacity due to its two-electron reaction, high lithiation potential and high density in the electrochemical reaction process. Therefore, t...

Claims

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Application Information

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Patent Type & Authority Patents(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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