Redox shuttles for high voltage cathodes

An electrochemical and battery technology, applied in battery electrodes, electrochemical generators, circuits, etc., can solve problems such as increasing cost and complexity, and achieve the effects of good capacity retention, high average voltage, and high initial capacity

Inactive Publication Date: 2011-03-23
3M INNOVATIVE PROPERTIES CO +1
View PDF23 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This circuit adds cost and complexity, and discourages the use of lithium-ion cells and battery packs i

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Redox shuttles for high voltage cathodes
  • Redox shuttles for high voltage cathodes
  • Redox shuttles for high voltage cathodes

Examples

Experimental program
Comparison scheme
Effect test

example

[0074] Octafluoronaphthalene was purchased from Aldrich Chemical and used as received. 2-Methoxyheptafluoronaphthalene was synthesized as described in the following preparation example. Mesophase carbon microspheres (MCMB) used to make anodes were purchased from E-One / Moli Energy Canada (Maple Ridge, B.C., Canada). LiFePO for making cathode 4 Available from Phostech Lithium (Quebec, Canada). Ethylene carbonate (EC), propylene carbonate (PC) and dimethyl carbonate (DMC) were purchased from Ferro Corp., Fine Chemicals Division (Zachary, LA), while LiPF 6 (available from Stella, Japan) was purchased from E-One / Moli Energy. Lithium bisoxalatoborate (LiBOB) was purchased from Chemetall (Germany). All solvents were high-purity battery grade and dried over 3A molecular sieves before use.

[0075] Using 0.1M chemical shuttle, 0.5M LiPF 6 Cyclic voltammograms were recorded in a standard three-electrode cell with an electrolyte composed of EC, DEC, PC, and DMC at a volume ratio of...

preparation example 1

[0079] Preparation example 1: Synthesis of 2-methoxyheptafluoronaphthalene

[0080] Octafluoronaphthalene (12 g, 0.044 mol), sodium methoxide (2.4 g, 0.0448 mol), and anhydrous methanol were combined in a 100 mL round bottom flask equipped with a reflux condenser and a dry nitrogen sparger. The mixture was refluxed for six hours. Samples were taken and analyzed by GC-FID. At six hours, there was 35% conversion to 2-methoxyheptafluoronaphthalene. An additional 2.0 g of sodium methoxide was added and the mixture was refluxed for an additional 6 hours. Additional methoxide and reaction time did not increase product conversion. The undissolved solid was then filtered at room temperature, and the crude product was recrystallized from aqueous methanol. The product was further purified by flash silica gel column chromatography using hexane as eluent. A total of 0.5 g of high-purity product was obtained. The structure was verified by GC / MS and the purity was 99.7% by GC-FID. ...

preparation example 2

[0081] Preparation Example 2: Preparation of 1,4-bis(2,2,2-trifluoroethoxy)-2,5-di-tert-butylbenzene

[0082] 2,5-di-tert-butylhydroquinone (3.23g, 0.014mol), potassium carbonate (powder, 325 mesh, 4.4g, 0.032mol), tri-n-butylamine (0.2g, 0.0011mol) and 30g The acetone solvent was mixed in a 100 mL three-necked round bottom flask. The flask was equipped with an overhead stirrer, thermocouple, addition funnel, cold water condenser, heating mantle, and dry nitrogen bubbler. Trifluoroethyl 2,2,2-perfluorobutanesulfonate (12.5 g, 0.032 mol, Aldrich) was added dropwise over a period of 2 hours while heating the reaction mixture at 58°C. After stirring for 24 hours, 80 mL of water was added at 58 °C, then the stirring was stopped and the heat source was removed. The product which crystallized in the lower phase at room temperature was filtered from the liquid using vacuum filtration. The crude product was then recrystallized in methanol / water, and the purity of the prepared sam...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

Overcharge protection is provided for rechargeable electrochemical lithium-ion cells. The electrolyte in the provided cells contains a cyclable redox shuttle molecule that can operate in cells with high voltage cathode materials.

Description

[0001] Related Patent Applications [0002] This patent application claims priority to US Provisional Patent Application No. 61 / 027,963, filed February 12, 2008, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to providing overcharge protection for rechargeable electrochemical lithium ion batteries. Background technique [0004] When properly designed and constructed, rechargeable lithium-ion batteries can exhibit excellent charge-discharge cycle life, have little or no memory effect, and high specific and volumetric energies. However, lithium-ion batteries do have some disadvantages, including inability to withstand recharging to potentials above the manufacturer's recommended end-of-charge potential without degradation in cycle life; overheating, the danger of adverse thermal events; and the difficulty of manufacturing large batteries with sufficient resistance to electrical and mechanical abuse in consume...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M10/40H01M10/42H01M10/36
CPCY02E60/122H01M2300/0025Y02T10/7011H01M10/052H01M10/4235H01M10/0567Y10T29/49108Y02E60/10H01M4/1391H01M4/525H01M10/0525Y02T10/70
Inventor 杰弗里·R·达恩威廉·M·拉曼纳迈克尔·J·布林斯基江俊伟李·莫舒查帕·T·彭理查德·L·王
Owner 3M INNOVATIVE PROPERTIES CO
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

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap