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Preparation method of flexible anode of lithium-selenium battery

A battery and flexible technology, applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of reduced relative content of active materials, limited battery energy density, poor electrochemical performance of batteries, etc., to achieve volume expansion and good performance. Effect of ion transport ability and conductivity, high crystallinity

Active Publication Date: 2015-06-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each process of the above method requires precise control, and the process is complicated
And the addition of inactive substances such as binders and conductive agents leads to a decrease in the relative content of active substances in the pole piece, which limits the energy density of the battery; the binder is not conductive, which will also lead to poor electrochemical performance of the battery, especially the rate The performance is not ideal, and the adhesive is also prone to failure during the battery cycle, causing the active material to peel off, which affects the development of lithium-selenium batteries

Method used

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  • Preparation method of flexible anode of lithium-selenium battery
  • Preparation method of flexible anode of lithium-selenium battery
  • Preparation method of flexible anode of lithium-selenium battery

Examples

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Embodiment 1

[0034] Wash the bacterial cellulose membrane (stored in the refrigerator) with deionized water, pre-freeze the sample with liquid nitrogen in a freeze dryer, and then freeze-dry it at a temperature of -48°C and a pressure of 0.04 mbar for 24 hours to obtain bacteria Cellulose membrane, and then knock the bacterial cellulose membrane into discs. 0.89g Zn(NO 3 ) 2 ·6H 2 O. Dissolve 0.49g of bis-methylimidazole in 100mL of DMF to prepare ZIF-8 synthetic solution. Soak the bacterial fiber membrane disc in the ZIF-8 synthetic solution with a concentration of 0.03mol / L. Under the hydrothermal reaction. After reacting for 24 hours, the product was washed and freeze-dried for another 24 hours to obtain a ZIF-8-coated bacterial cellulose membrane material. The obtained product was placed in a tube furnace, in an argon or nitrogen flow, at a heating rate of 5 °C / min, carbonized at 800 °C and kept for 4 hours, to obtain a specific surface area of ​​1500 m 2 / g, nitrogen mass content i...

Embodiment 2

[0042] Clean the bacterial cellulose membrane (stored in the refrigerator) with deionized water, pre-freeze the sample with liquid nitrogen in a freeze dryer, and then freeze-dry it at a temperature of -50 ° C and a pressure of 0.06 mbar for 20 hours to obtain bacteria Cellulose membrane, and then knock the bacterial cellulose membrane into discs. 0.89g Zn(NO 3 ) 2 ·6H 2 O. Dissolve 0.74g of bis-methylimidazole in 100mL DMF to prepare ZIF-8 synthetic solution. Soak the bacterial fiber membrane disk in the ZIF-8 synthetic solution with a concentration of 0.03mol / L. Under the hydrothermal reaction. After reacting for 18 hours, the product was washed and then freeze-dried for 20 hours to obtain a ZIF-8-coated bacterial cellulose membrane material. The obtained product was placed in a tube furnace, and in an argon or nitrogen flow, at a heating rate of 5°C / min, carbonized at 900°C and kept for 3h to obtain a specific surface area of ​​1400m 2 / g, nitrogen mass content is 14% ...

Embodiment 3

[0044] Bacterial cellulose membranes washed with deionized water (stored in a refrigerator), pre-frozen samples with liquid nitrogen in a freeze dryer, and then freeze-dried at a temperature of -30°C and a pressure of 0.01 mbar for 24 hours to obtain Bacterial cellulose membrane, and then knock the bacterial cellulose membrane into discs. 1.48g Zn(NO 3 ) 2 ·6H 2 O. Dissolve 0.82g of bis-methylimidazole in 100mL DMF to prepare ZIF-8 synthetic solution. Soak the bacterial fiber membrane disk in the ZIF-8 synthetic solution with a concentration of 0.05mol / L. Under the hydrothermal reaction. After reacting for 18 hours, the product was washed, and then freeze-dried for 24 hours to obtain a ZIF-8-coated bacterial cellulose membrane material. The obtained product was placed in a tube furnace, in an argon or nitrogen flow, at a heating rate of 5 °C / min, carbonized at 800 °C and kept for 4 hours, to obtain a specific surface area of ​​1500 m 2 / g, a nitrogen mass content of 12% a...

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Abstract

The invention discloses a preparation method of a flexible anode of a lithium-selenium battery. The flexible anode is compounded of a carbon fiber film and elemental selenium, wherein the carbon fiber film is self-supported and modified with nitrogen-containing porous carbon on the surface. The preparation method concretely comprises the steps of in situ forming a metal-organic framework ZIF-8 on a freeze-dried bacterial cellulose membrane, carrying out high temperature carbonization, and enabling the product to be compounded with a selenium-containing organic solvent. The flexible anode of the lithium-selenium battery, obtained by the method, has the advantages of good selenium fixing effect, high selenium content, high mechanical strength, etc. Furthermore, the preparation method is simple and does not need a complicated coating technology; the prepared flexible anode of the lithium-selenium battery is free of a bonding agent, a conductive agent and a current collector, is applied to the lithium-selenium battery and has excellent electrochemical performance.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode of a lithium-selenium battery, belonging to the field of lithium-selenium batteries. Background technique [0002] The continuous growth of population, the gradual consumption of energy and the continuous deterioration of the environment make it extremely urgent to find efficient and clean energy storage devices. Among them, the high specific capacity and long service life of lithium batteries make them widely used in portable electronic devices and electric vehicle plug-in hybrid electric vehicles. However, at this stage, the improvement of the specific capacity of the positive electrode material of the lithium battery is limited, and the development of a battery system with high energy density has long been the general trend. The theoretical volumetric energy density of lithium-sulfur batteries is 3467mA h / cm 3 , It is expected to significantly improve the cruising range of electr...

Claims

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Application Information

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IPC IPC(8): H01M4/1397
CPCH01M4/139H01M4/362H01M10/052Y02E60/10
Inventor 张治安张娟赵星星李劼赖延清
Owner CENT SOUTH UNIV
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