Electrolyte materials for use in electrochemical cells

a technology of electrochemical cells and electrochemical materials, applied in the field of electrochemical cells, can solve the problems of limited capacity, incomplete destruction of batteries, and many technical problems that have not yet been solved

Inactive Publication Date: 2012-03-01
SION POWER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in contrast to conventional lead-based secondary batteries, various technical problems have not yet been solved.
Although the batteries mentioned therein exhibit advantageous features, they are limited in capacity.
A particular problem with lithium sulfur batteries is the thermal runaway which can be observed at elevated temperatures between, e.g., 150 to 230° C. and which leads to complete destruction of the battery.
However, those methods usually lead to a dramatic reduction in capacity.
However, the thermal runaway problem has not been solved satisfactorily.

Method used

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  • Electrolyte materials for use in electrochemical cells
  • Electrolyte materials for use in electrochemical cells
  • Electrolyte materials for use in electrochemical cells

Examples

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example 1

[0171]This example outlines, according to one set of embodiments, the manufacture of an inventive electrochemical cell EC.1

[0172]A slurry was prepared from a solution of polyethersulfone (C.1) (10% wt.) and filler (G.1) (10% wt.) in diethyleneglycol dimethyl ether was coated onto vacuum deposited lithium (VDL) on a web coater. The weight ratio of polysulfone / silica was 7:3. The gel layer was dried in a gel coater oven at 65-80° C. An anode (B.1) with a dry gel layer was obtained. The resulting thickness of the dry gel layer was 7 μm. A triple bi-cell with above anodes (B.1), separators (I.1) and cathodes (A.1) was assembled and filled with electrolyte 1. Inventive electrochemical cell EC.1 was obtained. Inventive electrochemical cell EC.1 displayed 1015 mAh / g sulfur specific capacity on the 5th discharge. Inventive electrochemical cell EC.1 was cycled for 10 cycles and went for a safety test. The inventive electrochemical cell EC.1 at fully charged conditions was ramped at 5° C. / min...

example 2

[0174]This example describes, according to some embodiments, the manufacture of an inventive electrochemical cell EC.3.

[0175]A slurry prepared from a solution of polyethersulfone (C.1) (10% wt.) and filler (G.2) (10% wt.) in diethyleneglycol dimethyl ether was coated onto VDL on a web coater. The weight ratio of polysulfone / silica was 7:3. The gel layer was dried in a gel coater oven at 65-80° C. An anode (B.3) with a dry gel layer was obtained. The resulting thickness of the dry gel layer was 7 μm. A triple bi-cell with above anodes (B.3), separators (I.1) and cathodes (A.1) was assembled and filled with electrolyte 1. Inventive electrochemical cell EC.3 was obtained. Inventive electrochemical cell EC.3 displayed 1025 mAh / g specific capacity on the 5th discharge. Inventive electrochemical cell EC.3 was cycled for 10 cycles and went for the safety test. Inventive electrochemical cell EC.3 was ramped to 230° C. without going into thermal runaway.

example 3

[0176]This example describes the manufacture of an inventive electrochemical cell EC.4, according to one set of embodiments.

[0177]A slurry prepared from a solution of polyethersulfone (C.1) (10% wt.) and filler (G.3) (10% wt.) in diethyleneglycol dimethyl ether was coated onto VDL on a web coater. The weight ratio of polysulfone / silica was 1:1. An anode (B.4) with a dry gel layer was obtained. The gel layer was dried in a gel coater oven at 65-80° C. An anode (B.4) with a dry gel layer was obtained. The resulting thickness of the dry gel layer was 7 μm. A triple bi-cell (EC.4) with above anodes (B.3), separators (I.2) and cathodes (A.1) was assembled and filled with electrolyte 1. Inventive electrochemical cell EC.4 was obtained. Inventive electrochemical cell EC.4 displayed 1019 mAh / g specific capacity on the 5th discharge.

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Abstract

Electrolyte materials for use in electrochemical cells, electrochemical cells comprising the same, and methods of making such materials and cells, are generally described. In some embodiments, the materials, processes, and uses described herein relate to electrochemical cells comprising sulfur and lithium such as, for example, lithium sulfur batteries. The electrolyte can comprise a polymeric material and, in some cases, an absorbed auxiliary material. For example, the electrolyte material can be capable of forming a gel, and the auxiliary material can comprise an electrolyte solvent. In some instances, the electrolyte material can comprise at least one organic (co)polymer selected from polyethersulfones. The non-fluid material in the electrolyte, when configured for use, can, alone or in combination with the optional absorbed auxiliary material, have a yield strength greater than that of lithium metal, in some embodiments. In some embodiments, the electrochemical cell (e.g., the electrolyte) can be configured such that the electrochemical cell can be cycled at relatively high temperatures without experiencing thermal runaway.

Description

RELATED APPLICATIONS[0001]This application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application Ser. No. 61 / 376,559, filed Aug. 24, 2010, and entitled “Electrolyte Materials for Use in Electrochemical Cells,” which is incorporated herein by reference in its entirety for all purposes.FIELD OF INVENTION[0002]Electrolyte materials for use in electrochemical cells, electrochemical cells comprising the same, and methods of making such materials and cells are generally described. In some embodiments, the materials, processes, and uses described herein relate to electrochemical cells comprising sulfur and lithium such as, for example, lithium sulfur batteries.BACKGROUND[0003]Lithium compound containing electric cells and batteries containing such cells are modern means for storing energy. They exceed conventional secondary batteries with respect to capacity and life-time and, in many times, use of toxic materials such as lead can be avoided. However, in contrast t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M10/0565H01M4/38H01M4/40B05D3/06H01M10/056B05D5/12B32B38/10H01M10/052H01M4/60
CPCH01M2/145Y02E60/122H01M4/134H01M4/366H01M4/382H01M4/405H01M4/581H01M4/5815H01M4/62H01M10/0525H01M10/0565H01M10/0568H01M10/0569H01M2300/0037H01M2/1673
Inventor MIKHAYLIK, YURIY V.KOVALEV, IGORMOEHWALD, HELMUTSCHMIDT, RUDIGER
Owner SION POWER CORP
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