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Fabrication method of soft package lithium-sulfur battery

A lithium-sulfur battery and a manufacturing method technology are applied in the direction of lithium-sulfur battery, electrolyte battery manufacturing, battery electrodes, etc., which can solve the problem of low specific capacity of lithium-sulfur battery at first discharge, increase migration and diffusion resistance, improve utilization rate, The effect of increasing the overall capacity

Inactive Publication Date: 2018-04-13
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a manufacturing method of a soft-pack lithium-sulfur battery, which solves the problem that the first discharge specific capacity of the lithium-sulfur battery obtained by the existing manufacturing method is low

Method used

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  • Fabrication method of soft package lithium-sulfur battery
  • Fabrication method of soft package lithium-sulfur battery
  • Fabrication method of soft package lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Ball mill 2g of porous carbon and 1g of sublimated sulfur for 10 hours to obtain a solid mixed powder; put the solid mixed powder into a hydrothermal reaction kettle, place it in a vacuum oven, and keep it warm at 170°C for 5 hours. After the reaction is completed, about 3g of sulfur / porous carbon is obtained Composite materials; the sulfur / porous carbon hybrid material was placed in a ball mill jar, and Co 3 o 4 After ball milling for 300min, Co 3 o 4 - Sulfur / porous carbon composites, where Co 3 o 4 The addition amount is 2wt% of the composite material; the Co 3 o 4 - Sulfur / porous carbon composites by Co 3 o 4 - Sulfur / porous carbon composite material: Super P: PVDF=95:2:3 (mass ratio) mixed with an appropriate amount of NMP, stirred at room temperature for 12 hours, so that the slurry was evenly mixed, and the solid content of the obtained slurry was 40%; then Use a coating machine to evenly coat the slurry on the aluminum foil, then place the aluminum foil ...

Embodiment 2

[0054] Ball mill 6g of KS-6 and 1g of sublimed sulfur for 5.5h to obtain a solid mixed powder; put the solid mixed powder into a hydrothermal reaction kettle, place it in a vacuum oven, and keep it warm at 145°C for 12.5h. After the reaction, about 7g of sulfur / KS-6 composite material; place the sulfur / KS-6 composite material in a ball mill jar, add Mg 0.6 Ni 0.4 After O, ball milled for 165min to obtain Mg 0.6 Ni 0.4 O-sulfur / KS-6 composite material, where Mg 0.6 Ni 0.4 The addition of O is 15wt% of the composite material; the Mg 0.6 Ni 0.4 O-sulfur / KS-6 composite material by Mg 0.6 Ni 0.4 O-sulfur / KS-6 composite material: (Super P+ graphene): (PVDF+PTFE) = 75:18:7 (mass ratio) mixed with an appropriate amount of NMP and deionized water, stirred at room temperature for 12 hours, and made the slurry Mix evenly, the solid content of the obtained slurry is 55%; then use a coating machine to evenly coat the slurry on the aluminum foil, then put the aluminum foil coated w...

Embodiment 3

[0056] Ball mill 10g of graphene-porous carbon and 1g of sublimated sulfur for 1 hour to obtain a solid mixed powder; put the solid mixed powder into a hydrothermal reaction kettle, place it in a vacuum oven, and keep it warm at 120°C for 20 hours. After the reaction, about 11g of sulfur / Graphene-porous carbon composite material; place the sulfur / graphene-porous carbon hybrid material in a ball mill jar, then add Mg 0.6 Ni 0.4 O and Co 3 o 4 After ball milling for 30min, Mg 0.6 Ni 0.4 O-Co 3 o 4 - Sulfur / graphene-porous carbon composites, where Mg 0.6 Ni 0.4 O and Co 3 o 4 The total amount added is 30wt% of the composite material; the Mg 0.6 Ni 0.4 O-Co 3 o 4 - Sulfur / graphene-porous carbon composites by Mg 0.6 Ni 0.4 O-Co 3 o 4 - Sulfur / graphene-porous carbon composite material: (KS-6+ carbon nanotube): (PVDF+SBR) = 55:35:10 (mass ratio) mixed with an appropriate amount of NMP, stirred at room temperature for 12 hours, to make the slurry Mix evenly, and the...

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Abstract

The invention discloses a fabrication method of a soft package lithium-sulfur battery. The fabrication method comprises the following steps of 1, combining a lithium negative electrode and a negativecurrent collector to obtain a negative pole plate; 2, obtaining a separator or a separator coated with a conductive agent and a binding agent in a mixed way; 3, mixing the conductive agent, a sulfur positive active material and the binding agent, performing coating on a positive current collector, and then drying and cutting to obtain a positive pole plate; and 4, assembling the negative pole plate, the separator and the positive pole plate of the steps 1-3, obtaining a battery cell after a tab is welded, assembling the battery cell into a package shell, and performing liquid injection, package and aging to obtain the soft package lithium-sulfur battery. According to the fabrication method of the soft package lithium-sulfur battery, and the initial discharging specific capacity, the coulombic efficiency and the cycle stability of the battery all can be effectively improved under a synergistic effect of the whole battery structure.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a manufacturing method of a soft-pack lithium-sulfur battery. Background technique [0002] The advent of the Internet era and the rapid development of electric vehicles and large-scale energy storage power stations have put forward higher requirements for the performance of lithium-ion secondary batteries, but the existing secondary lithium-ion batteries are not enough due to their own material characteristics. meet demand. Lithium-sulfur batteries have up to 1680mA·h·g -1 The theoretical specific capacity and 2600W·h·kg -1 It is considered to be a very promising secondary battery system due to its outstanding theoretical energy density, as well as its outstanding advantages such as low price of active material sulfur, abundant resources and low toxicity. However, sulfur is an electron and ionic insulator and is difficult to use alone as a cathode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/058H01M4/36H01M4/38H01M4/62
CPCH01M4/364H01M4/38H01M4/628H01M10/052H01M10/058H01M2004/021Y02E60/10Y02P70/50
Inventor 杨蓉付欣任冰许云华陈利萍
Owner XIAN UNIV OF TECH
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