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A preparation method for functional interlayer of lithium-sulfur battery

A lithium-sulfur battery and functional technology, applied in the field of preparation of functional separators, can solve the problems of low utilization rate of active materials, poor performance of lithium-sulfur batteries, etc.

Active Publication Date: 2021-09-10
HEBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention mixes the metal cobalt salt and the spinning solution and then spins, and dries and calcines the fibers spun by high-voltage electrospinning to obtain tricobalt tetroxide nanofibers, and then cuts to obtain functional interlayers. Through this method Improve the polysulfide shuttle effect in the lithium-sulfur battery existing in the prior art, and the utilization rate of the active material 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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  • A preparation method for functional interlayer of lithium-sulfur battery
  • A preparation method for functional interlayer of lithium-sulfur battery
  • A preparation method for functional interlayer of lithium-sulfur battery

Examples

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Effect test

Embodiment example 1

[0027] The first step, preparation of electrospinning precursor solution:

[0028] Add 0.3g Co(NO 3 ) 2 ·6H 2 O and 5ml ethanol and 5ml N,N-dimethylformamide (DMF), stirred for 20min, added 0.7g PVP to the mixed solution, stirred for 1h, and finally ultrasonicated for 1h in an ultrasonic machine to obtain the electrospinning precursor .

[0029] The second step, the preparation of metal cobalt salt nanofiber membrane:

[0030] Put the mixed solution into the syringe, control the working voltage to 20KV, adjust the distance between the receiver and the spinning needle to be 15cm, and the outflow speed of the solution to be 0.5ml / h to obtain the metal cobalt salt nanofiber membrane.

[0031] In the third step, Co 3 o 4 Preparation of nanofibers:

[0032] The spun metal cobalt salt fiber membrane was dried in a vacuum oven (70°C) for 10h, and then calcined in a muffle furnace at 500°C for 5h. Then naturally lowered to room temperature, the Co 3 o 4 Nanofibers.

[0033]...

Embodiment example 2

[0039] The first step, preparation of electrospinning precursor solution:

[0040] Add 0.3g Co(NO 3 ) 2 ·6H 2 O and 10ml ethanol and 5ml N,N-dimethylformamide (DMF), stirred for 20min, then added 1g of PVP to the mixed solution, stirred for another 2h, and finally ultrasonicated in an ultrasonic machine for 1h to obtain an electrospinning precursor.

[0041] The second step, the preparation of metal cobalt salt nanofiber membrane:

[0042] Put the mixed solution into the syringe, control the working voltage to 20KV, adjust the distance between the receiver and the spinning needle to be 15cm, and the outflow rate of the solution to be 0.5ml / h to obtain the metal salt nanofiber membrane.

[0043] In the third step, Co 3 o 4 Preparation of nanofibers:

[0044] The spun metal cobalt salt fiber membrane was dried in a vacuum oven (70°C) for 10h, and then calcined in a muffle furnace at 500°C for 5h. Then naturally lowered to room temperature, the Co 3 o 4 Nanofibers.

[0...

Embodiment example 3

[0049] The first step, preparation of electrospinning precursor solution:

[0050] Add 0.3g Co(NO 3 ) 2 ·6H 2 O and 5ml ethanol and 5ml N,N-dimethylformamide (DMF), stirred for 20min, then added 0.7g PVP to the mixed solution, stirred for 2h, and finally ultrasonicated for 1h in an ultrasonic machine to obtain an electrospinning precursor .

[0051] The second step, the preparation of metal cobalt salt nanofiber membrane:

[0052] Put the mixed solution into the syringe, control the working voltage to 10KV, adjust the distance between the receiver and the spinning needle to 25cm, and the outflow rate of the solution to 0.1ml / h to obtain the metal salt nanofiber membrane.

[0053] In the third step, Co 3 o 4 Preparation of nanofibers:

[0054] The spun metal cobalt salt fiber membrane was dried in a vacuum oven (70°C) for 10h, and then calcined in a muffle furnace at 500°C for 5h. Then naturally lowered to room temperature, the Co 3 o 4 Nanofibers.

[0055] The fourt...

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Abstract

The invention is a method for preparing a functional interlayer applied to a lithium-sulfur battery. In the method, the metal cobalt salt and the spinning liquid are mixed and then spun, and the fibers spun by high-voltage electrospinning are dried and calcined to obtain tricobalt tetroxide nanofibers, and then cut to obtain functional interlayers. The invention can improve the polysulfide shuttling effect in the lithium-sulfur battery in the prior art, and the low utilization rate of the active material in the positive electrode material leads to the defect of poor performance of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of preparation of battery interlayers, and more specifically relates to a preparation method of a functional interlayer applied to lithium-sulfur batteries. Background technique [0002] Lithium-sulfur batteries have a high theoretical specific capacity (1675mAh g -1 ) and theoretical energy density (2600Wh kg -1 ), and the advantages of high capacity and low cost, it is most likely to become the next-generation battery after lithium-ion batteries and one of the new high-energy chemical power systems with the most development potential. However, the limitations of lithium-sulfur batteries include shuttle effect during long-term cycling of lithium polysulfides, inefficient use of sulfur, and severe volume expansion (80%). In addition, the diffusion of lithium polysulfide intermediates and the redox reaction will lead to severe self-discharge phenomenon and low coulombic efficiency, resulting in poor reversi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/44H01M50/431H01M50/451H01M50/406H01M50/454
CPCH01M50/431H01M50/44H01M50/403H01M50/449Y02E60/10
Inventor 张永光单真真
Owner HEBEI UNIV OF TECH
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