Preparation method of high-energy density lithium sulphur power battery and battery

A high energy density, power battery technology, applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle stability and cruising range of less than 350 kilometers, and achieve the effect of increasing energy density, low price, and abundant resources

Inactive Publication Date: 2018-09-14
桑顿新能源科技(长沙)有限公司
12 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

At this stage, lithium-ion power batteries using ternary materials as positive electrodes have an energy density of only 200Wh/kg to 280Wh/kg, and a cruising range of less than 350 k...
View more

Abstract

The invention discloses a preparation method of a high-energy density lithium sulphur power battery and a battery. Metal lithium is compactly pressed into foam copper; the formation of arborescent crystals in the lithium sulphur battery can be relieved through the pore structures of the foam copper; the diaphragm piercing by the lithium arborescent crystals can be avoided; the safety performance of the battery is improved; in addition, a diaphragm bag with an opening at one end is used for encapsulating the foam copper/ lithium negative electrode sheet to obtain a fully sealed small unit; on one hand, the short circuit problem due to positive electrode and negative electrode position staggering caused by diaphragm drapes in the sheet lamination process can be solved; on the other hand, thedirect contact between the metal lithium layer with the air or the oxygen gas in the sheet lamination process can be avoided.

Application Domain

Cell electrodesSecondary cells

Technology Topic

High energyEngineering +9

Image

  • Preparation method of high-energy density lithium sulphur power battery and battery
  • Preparation method of high-energy density lithium sulphur power battery and battery
  • Preparation method of high-energy density lithium sulphur power battery and battery

Examples

  • Experimental program(1)
  • Comparison scheme(1)
  • Effect test(1)

Example Embodiment

[0030] Example 1
[0031] Step S1: Preparation of Sulfur-Containing Cathode Active Material
[0032] Weigh elemental sulfur and sepiolite respectively according to the weight percentage of 75%: 25%, first perform preliminary mixing to make elemental sulfur evenly mixed in sepiolite, then mix and grind in a ball mill for 3 hours, and then put the mixed powder into a tube In the furnace, the temperature was set to 155 °C under vacuum or N2 atmosphere, and calcined for 3 hours; then the temperature was further heated to 320 °C, and calcined for 1 hour to remove the elemental sulfur that was not incorporated on the mixing surface; finally, the particle size was obtained by pulverizing with a pulverizer. Sepiolite/sulfur composites smaller than 15 μm.
[0033] Step S2: Preparation of Cathode Slurry
[0034] First, weigh the sepiolite/sulfur composite material, acetylene black, and PVDF according to the weight percentage of 89%: 7.5%: 3.5%, and then weigh the solvent NMP according to the ratio of the solid content of the glue liquid to 6%. The stirring speed is 40 rpm, The dispersion speed was 35 r/min, and a uniform and transparent glue was obtained for 3 h; then the conductive agent acetylene black was added according to the stirring speed of 35 r/min and the dispersion speed of 35 r/min, and the operation was carried out for 1 h; finally, the sepiolite/sulfur composite material was added, According to the stirring speed of 35 rpm and the dispersion speed of 30 rpm, the positive electrode slurry was obtained after running for 4 hours. The solid content of the positive electrode slurry was 67.7%, the viscosity was 9200 mpa.s, and the slurry fineness was about 25 μm.
[0035] Step S3: Preparation of negative electrode sheet/separator
[0036] A metal lithium layer 7 is embedded in the middle of the two layers of porous copper foam 8, and in an inert atmosphere, a high pressure of 15Kg/cm 2 The foamed copper/lithium negative electrode sheet 12 is obtained by compacting, and then the foamed copper/lithium negative electrode sheet 12 is inserted into the diaphragm bag 4 with one end open, and finally the open end is hot-pressed and closed to form the negative electrode/diaphragm small unit 13 .
[0037] Step S4: Fabrication of positive electrode sheet
[0038] The positive electrode slurry prepared in step S2 is evenly coated on the carbon-coated aluminum foil current collector, the surface of the aluminum foil is coated with a layer of carbon nanotubes with a thickness of 12-16 μm, and the desired positive electrode is obtained by baking, rolling and die-cutting. piece.
[0039] Step S5: Battery Assembly
[0040] Stack the negative electrode/diaphragm cell and the positive electrode piece obtained in step S3 and step S4 to form a bare cell, then put the bare cell into an aluminum-plastic film airtight case, and finally add additive LiNO 3 The electrolyte solution with a specific gravity of 6.0% was sealed to obtain a 25Ah finished cell.

PUM

PropertyMeasurementUnit
Fineness<= 1.0µm
Particle size<= 15.0µm
Thickness15.0 ~ 20.0µm

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Similar technology patents

Supercritical water jet cleaning equipment

Owner:INST OF MICROELECTRONICS CHINESE ACAD OF SCI

Method and system for controlling cabinet door lock

InactiveCN109559414AEasy to monitor and manageImprove safety performance
Owner:武汉武钢绿色城市技术发展有限公司

Classification and recommendation of technical efficacy words

  • Improve safety performance
  • avoid direct contact

Electric monocycle

InactiveCN104760644AImprove safety performanceAdaptable to road conditions
Owner:UNIV OF SHANGHAI FOR SCI & TECH

Near field communication terminal with security mechanism

ActiveCN102215053AImprove safety performancePrevent false charges
Owner:HUIZHOU TCL MOBILE COMM CO LTD

Network system for realizing integrated security services

ActiveCN101771619AImprove safety performance
Owner:NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP

Liquid crystal display panel

Owner:HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1

Functional enterostomy cannula

InactiveCN105708608AGood tissue compatibilityavoid direct contact
Owner:AFFILIATED HUSN HOSPITAL OF FUDAN UNIV

Refrigerator

ActiveCN102620499Aavoid direct contactImprove freshness preservation performance
Owner:HEFEI MIDEA REFRIGERATOR CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products