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A preparation method of a positive electrode modified spacer applied in a lithium sulfur battery

A lithium-sulfur battery and positive electrode technology, which is applied in the field of preparation of positive electrode modified interlayers, can solve the problems of low utilization rate of active materials and poor performance of lithium-sulfur batteries, and achieve rich pores, good thermal stability and mechanical properties, Effect of improving absorption characteristics

Inactive Publication Date: 2019-01-15
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention adopts the electrospinning method to prepare continuous nano-ZnO fiber membrane, and then carries out carbonization treatment on the electrospun ZnO membrane to obtain the positive electrode modified interlayer, the modified interlayer obtained by this method improves the lithium sulfur existing in the prior art The polysulfide shuttle effect in the battery and the low utilization rate of the active material in the positive electrode material lead to the defects of poor performance of lithium-sulfur batteries

Method used

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  • A preparation method of a positive electrode modified spacer applied in a lithium sulfur battery
  • A preparation method of a positive electrode modified spacer applied in a lithium sulfur battery
  • A preparation method of a positive electrode modified spacer applied in a lithium sulfur battery

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Embodiment 1

[0028] The first step, preparation of electrospinning precursor solution:

[0029] Under magnetic stirring state, in 20g 10% (mass percentage) polyvinyl alcohol solution, slowly dropwise add zinc acetate solution (1.5g (CH 3 COO) 2 Zn·H 2 O and 2g H 2 o). Then reflux in a water bath at 60°C for 5h for later use.

[0030] The second step, the preparation of ZnO nanofiber membrane:

[0031] Put the mixed solution into the syringe, control the working voltage to 10kV, adjust the distance between the receiver and the spinning needle to be 10cm, and the outflow rate of the solution to be 0.5ml / h, and obtain the ZnO nanofiber membrane after spinning for 6 hours.

[0032] The third step, the preparation of ZnO nanofibers:

[0033] The spun fiber membrane was dried in a vacuum oven (70°C) for 8h, and then calcined at 700°C for 5h. Then cool down to room temperature naturally to get ZnO nanofibers.

[0034] The fourth step, the preparation of the positive electrode separator: ...

Embodiment 2

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

[0040] Under magnetic stirring state, in 20g 30% (mass percentage) polyvinyl alcohol solution, slowly dropwise add zinc acetate solution (3g (CH 3 COO) 2 Zn·H2O and 1g H 2 o). Then reflux in a water bath at 80°C for 5h for later use.

[0041] The second step, the preparation of ZnO nanofiber membrane:

[0042] Add the mixed solution into the syringe, control the working voltage to 10kV, adjust the distance between the receiver and the spinning needle to 10cm, and the outflow rate of the solution to 0.5ml / h, and obtain the ZnO nanofiber membrane after spinning for 4 hours.

[0043] The third step, the preparation of ZnO nanofibers:

[0044] The spun fibers were dried in a vacuum oven (70°C) for 8h, and then calcined at 700°C for 5h. Then cool down to room temperature naturally to get ZnO nanofibers.

[0045] The fourth step, the preparation of the positive electrode separator:

[0046] Place the...

Embodiment 3

[0048] The first step, preparation of electrospinning precursor solution:

[0049] Under magnetic stirring state, in 20g 10% (mass percentage) polyvinyl alcohol solution, slowly dropwise add zinc acetate solution (1.5g (CH 3 COO) 2 Zn·H2O and 2g H 2 o). Then reflux in a water bath at 60°C for 5h for later use.

[0050] The second step, the preparation of ZnO nanofiber membrane:

[0051] Put the mixed solution into the syringe, control the working voltage to 20kV, adjust the distance between the receiver and the spinning needle to 20cm, the outflow rate of the solution to 0.8ml / h, and the spinning time to 4~8h, to obtain the ZnO nanofiber membrane.

[0052] The third step, the preparation of ZnO nanofibers:

[0053] The spun fiber membrane was dried in a vacuum oven (70°C) for 8h, and then calcined at 700°C for 5h. Then cool down to room temperature naturally to get ZnO nanofibers.

[0054] The fourth step, the preparation of the positive electrode separator:

[0055] P...

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Abstract

The invention relates to a preparation method of a positive electrode modified spacer applied in a lithium sulfur battery, the method adopts electrostatic spinning method to prepare continuous nano ZnO fiber membrane, Then, through carbonizing the electrospun ZnO film to obtain the cathode modified spacer, the modified spacer obtained by the method improves the polysulfide shuttle effect in the lithium-sulfur battery existing in the prior art, and the utilization ratio of the active material in the cathode material is low, which leads to the poor performance of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of lithium battery preparation, and more specifically relates to a preparation method of a positive electrode modified interlayer applied in a lithium-sulfur battery. Background technique [0002] With the urgent demand for new energy in today's world, more and more clean energy is applied in electric power and power equipment. Lithium-ion batteries have become the first choice for many energy storage devices due to their advantages of portability, high specific energy, environmental friendliness, and recyclability. As the positive electrode material of lithium-sulfur batteries, elemental sulfur has a theoretical capacity of 1675 mAh / g and a theoretical energy density of 2600 Wh / kg, which will play an important role in the future development of lithium batteries. However, due to the poor conductivity of elemental sulfur and its intermediate products in the charge and discharge process, and the shuttle effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/052H01M4/38
CPCH01M4/38H01M4/667H01M10/052Y02E60/10
Inventor 王新单真真
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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