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Preparation method of cathode functional interlayer applied to lithium-sulfur battery

A lithium-sulfur battery and functional technology, applied in the field of preparation of positive functional separators, can solve the problems of low utilization rate of active materials, poor performance of lithium-sulfur batteries, etc., achieve rich pores, improve the shuttle effect of polysulfides, The effect of large specific surface area

Inactive Publication Date: 2018-02-23
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention adopts polyacrylonitrile (PAN) fiber as a precursor, utilizes electrospinning process to prepare continuous nanofiber film, and improves the current The polysulfide shuttle effect in the lithium-sulfur battery that exists in the existing technology, the active material utilization rate in the positive electrode material is low, resulting in the defect of poor performance of the lithium-sulfur battery

Method used

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  • Preparation method of cathode functional interlayer applied to lithium-sulfur battery
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  • Preparation method of cathode functional interlayer applied to lithium-sulfur battery

Examples

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Embodiment example 1

[0029] The first step, preparation of electrospun PAN membrane:

[0030] The PAN powder and the DMF solution were mixed at a mass ratio of 1:9, sealed and placed in a constant temperature water bath at 65°C for 24 hours with mechanical stirring to obtain an electrospinning solution. Fix the syringe with PAN / DMF solution on the micropump, adjust the distance between the needle tip and the receiving cylinder to the set distance of 25cm, start the motor, set the speed at 1000r / min, turn on the high voltage power supply and adjust to the set A good voltage is 15KV to check whether the spinning is in progress. After 24 hours of spinning, the high-voltage electrospinning device was turned off, and the spun fiber membrane was cut into sealed bags for later use.

[0031] The second step, pre-heat treatment of electrospun PAN membrane:

[0032] The PAN electrospun membrane is pre-heated in a muffle furnace. First, the temperature is raised from room temperature to 120°C at 3°C / min, t...

Embodiment example 2

[0036] The first step, preparation of electrospun PAN membrane:

[0037] The PAN powder and the DMF solution were mixed at a mass ratio of 1:9, sealed and placed in a constant temperature water bath at 65°C for 24 hours with mechanical stirring to obtain an electrospinning solution. Fix the syringe with PAN / DMF solution on the micropump, adjust the distance between the needle tip and the receiving cylinder to the set distance of 25cm, start the motor, set the speed at 1000r / min, turn on the high voltage power supply and adjust to the set A good voltage is 15KV to check whether the spinning is in progress. After 24 hours of spinning, the high-voltage electrospinning device was turned off, and the spun fiber membrane was cut into sealed bags for later use.

[0038] The second step, pre-heat treatment of electrospun PAN membrane:

[0039] The PAN electrospun membrane is pre-heated in a muffle furnace. First, the temperature is raised from room temperature to 120°C at 3°C / min, t...

Embodiment example 3

[0043] The first step, preparation of electrospun PAN membrane:

[0044] The PAN powder and the DMF solution were mixed at a mass ratio of 1:9, sealed and placed in a constant temperature water bath at 65°C for 24 hours with mechanical stirring to obtain an electrospinning solution. Fix the syringe with PAN / DMF solution on the micropump, adjust the distance between the needle tip and the receiving cylinder to the set distance of 25cm, start the motor, set the speed at 1000r / min, turn on the high voltage power supply and adjust to the set A good voltage is 15KV to check whether the spinning is in progress. After 24 hours of spinning, the high-voltage electrospinning device was turned off, and the spun fiber membrane was cut into sealed bags for later use.

[0045] The second step, pre-heat treatment of electrospun PAN membrane:

[0046] The PAN electrospun membrane is pre-heated in a muffle furnace. First, the temperature is raised from room temperature to 120°C at 3°C / min, t...

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Abstract

The invention discloses a preparation method of a cathode functional interlayer applied to a lithium-sulfur battery. The preparation method comprises the following steps: S1, preparation of a polyacrylonitrile membrane by electrostatic spinning: polyacrylonitrile powder and N,N-dimethyl formamide are mixed, the materials are sealed and stirred till a transparent uniform solution is obtained, and electrostatic spinning is used for preparing polyacrylonitrile fibre; S2, pretreatment of the static spinning PAN membrane; S3, carbonization treatment: the electrostatic spinning PAN membrane which istreated by heat treatment in advance in S2 is carbonized. The material can be applied to a functional interlayer, and the material is placed between the cathode and the diaphragm in order to play aneffect for physically or chemically fixing shuttle of polysulfide and improving utilization rate of cathode active substances. In the charge and discharge process, the product is good for reducing polarization phenomenon of electrodes in the electrochemistry process, so that volume expansion problem of electrode materials is effectively alleviated, circulating performance of the electrodes is improved, and electrochemical performance of the lithium-sulfur battery is furthermore enhanced.

Description

technical field [0001] The invention belongs to the technical field of battery separator preparation, and more specifically relates to a method for preparing a positive electrode functional separator applied to a lithium-sulfur battery. Background technique [0002] With the rapid development of science and technology and information industry, the world is in urgent need of renewable energy and new energy. Lithium-ion batteries have the advantages of high specific energy, environmental friendliness and pollution-free, abundant resources, and low price, and have become the choice of energy storage devices such as mobile electronic products and electric vehicles. Using sulfur as the cathode material of lithium-sulfur batteries, its theoretical capacity can reach 1675mAh / g, and its theoretical energy density can reach 2600 Wh / kg. Lithium-sulfur batteries are considered to be one of the most promising secondary batteries. However, the poor conductivity of elemental sulfur and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M50/403H01M50/44
CPCH01M50/403Y02E60/10
Inventor 张永光王新
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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