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Method for preparing high-performance lithium-sulfur battery on basis of nitrogen-enriched molecule modified diaphragm

A lithium-sulfur battery and molecular technology, which is applied to battery components, non-aqueous electrolyte batteries, and electrolyte battery manufacturing, etc., can solve the problems of difficulty in controlling the form of N, low content of N heteroatoms, and cumbersome preparation process. It is convenient for large-scale production, the equipment and production process are simple, and the raw materials are cheap and easy to obtain.

Inactive Publication Date: 2017-09-26
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite these outstanding advantages, current research on lithium-sulfur batteries still cannot meet the requirements of practical applications due to defects such as rapid capacity fading and short cycle life.
This is mainly because there are several very difficult problems in the lithium-sulfur battery system: (1) the conductivity of the active material sulfur and its discharge products is poor; (2) the high polysulfides formed during the discharge process are highly dissolved in the electrolyte (3) volume change during the solid-liquid-solid electrochemical reaction
However, most of the currently reported preparation processes are tedious, but the content of introduced N heteroatoms is low (<10%)
In addition, according to density functional theory calculations, polar polysulfides have stronger chemical interactions with pyridinic N (Pyridinic-N), but most of the current synthetic methods are difficult to control the form of N in the final product.

Method used

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  • Method for preparing high-performance lithium-sulfur battery on basis of nitrogen-enriched molecule modified diaphragm
  • Method for preparing high-performance lithium-sulfur battery on basis of nitrogen-enriched molecule modified diaphragm
  • Method for preparing high-performance lithium-sulfur battery on basis of nitrogen-enriched molecule modified diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Take a certain amount of graphitized carbon nitride, a certain amount of conductive agent acetylene black, and a certain amount of binder PVDF, the mass ratio of the three is 6:3:1, add it to the mortar, and grind it thoroughly , to mix the three evenly, then transfer the mixture to a beaker, add a certain amount of dispersant NMP, the amount of dispersant should be appropriate to ensure a suitable viscosity, and then fully stir and mix evenly. Take out the commercial fiberglass separator needed to install the battery from the glove box, cut it into a suitable size, and then lay it flat. Spread the prepared slurry evenly on one side of the separator, and then transfer the separator to a vacuum oven. Vacuum dry at 60°C for 24 hours, then take out the separator, cut it into the diameter required for the button battery, and transfer it to the glove box again. When installing the battery, put the modified separator between the positive and negative electrodes, and coat it wi...

Embodiment 2

[0029]Take a certain amount of graphitized carbon nitride, a certain amount of conductive agent carbon nanofiber, and a certain amount of binder PVDF, the mass ratio of the three is 6:3:1, and add them to the mortar, fully Grind to make the three evenly mixed, then transfer the mixture to a beaker, add a certain amount of dispersant NMP, the amount of dispersant should be appropriate to ensure a suitable viscosity, then stir well and mix evenly. Take out the commercial fiberglass separator needed to install the battery from the glove box, cut it into a suitable size, and then lay it flat. Spread the prepared slurry evenly on one side of the separator, and then transfer the separator to a vacuum oven. Vacuum dry at 60°C for 24 hours, then take out the separator, cut it into the diameter required for the button battery, and transfer it to the glove box again. When installing the battery, put the modified separator between the positive and negative electrodes, and coat it with On...

Embodiment 3

[0031] Take a certain amount of graphitized carbon nitride, a certain amount of conductive agent acetylene black, and a certain amount of binder PVDF, the mass ratio of the three is 1:8:1, add it to the mortar, and grind it thoroughly , to mix the three evenly, then transfer the mixture to a beaker, add a certain amount of dispersant NMP, the amount of dispersant should be appropriate to ensure a suitable viscosity, then stir well and mix evenly. Take out the commercial fiberglass separator needed to install the battery from the glove box, cut it into a suitable size, and then lay it flat. Spread the prepared slurry evenly on one side of the separator, and then transfer the separator to a vacuum oven. Vacuum dry at 60°C for 24 hours, then take out the separator, cut it into the diameter required for the button battery, and transfer it to the glove box again. When installing the battery, put the modified separator between the positive and negative electrodes, and coat it with O...

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Abstract

The invention belongs to the technical field of new energy materials, and particularly relates to a method for improving the property of a lithium-sulfur battery by coating one side of a common commercial diaphragm with a polysulfide barrier layer. By the strong chemical interaction between Pyridinic-N-enriched molecules and polysulfide, the Pyridinic-N-enriched molecules is introduced on the diaphragm and is used as an adsorbent of the polysulfide to relieve shuttle loss of an active material. Meanwhile, a certain amount of conductive substances are introduced onto the diaphragm to reduce electric resistance in the battery, and utilization of the active material is improved. The lithium-sulfur battery with the design has quite excellent electrochemical performance. After 400-time circulation under the high current density (1C=1,675mAg-1) of 0.5 C, the capacity of the battery is still maintained at 840 mAhg-1, and the attenuation rate of the capacity is only 0.07%. Besides a sulfur anode material which is easily obtained commercially and is used for reducing cost and simplifying a preparation process, the organic molecules which contain a large number of Pyridinic-N are introduced and are light in weight and non-toxic, mass production of the capacity is implemented, and practicability of the lithium-sulfur battery is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and particularly relates to a method for modifying a diaphragm by using simple nitrogen-rich molecules. The obtained diaphragm can effectively confine polysulfides in the positive electrode region, greatly improving the capacity and cycle of lithium-sulfur batteries. Stability, which has important applications in the field of energy storage of lithium-sulfur batteries. Background technique [0002] Lithium-sulfur batteries due to their high energy density (2567W h kg -1 ) has become the most potential next-generation energy storage system. In addition, sulfur is widely distributed in nature, cheap, and environmentally friendly. Despite these outstanding advantages, current research on lithium-sulfur batteries still cannot meet the requirements of practical applications due to defects such as rapid capacity fading and short cycle life. This is mainly because there are several very d...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M10/058
CPCH01M10/058H01M50/403Y02E60/10Y02P70/50
Inventor 张景萍范朝英孙海珠
Owner NORTHEAST NORMAL UNIVERSITY
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