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Electrolytes having improved low temperature performance

An electrolyte and electrode technology, applied in circuits, electrical components, battery electrodes, etc.

Inactive Publication Date: 2002-01-30
VALENCE TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is currently no method to maintain the usability of the electrolyte over a wide temperature range, especially at low temperatures

Method used

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  • Electrolytes having improved low temperature performance
  • Electrolytes having improved low temperature performance
  • Electrolytes having improved low temperature performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0056] Graphite electrodes were prepared by casting a paste containing BG-35 graphite, binder, plasticizer and solvent for casting. BG-35 graphite was supplied by Superior Graphite, Chicago, IL. BG series graphite is high-purity graphite obtained by purifying natural flake graphite by heat treatment. Its physical properties are shown in Table III. The binder was a copolymer of polyvinylidene fluoride (PVDF) to hexafluoropropylene (HFP) in a weight ratio (PVDF:HFP) of 88:12. The adhesive is based on Kynar Flex 2801  Sold under item number, this is a registered trademark. Kynar Flex was purchased from Atochem Corporation. Use an electronic grade solvent. The paste is cast onto a glass plate, and when the solvent evaporates, an electrode is formed. Electrode composition containing, on a dry weight % basis: 60% graphite, 16% binder, 21% plasticizer and 2% conductive carbon.

[0057] The cathode electrode is also made by casting a paste containing lithium manganese oxide (L...

Embodiment II

[0060] Prepare another battery according to the method of Example 1, the difference is that the electrolyte is 1 mole of EC / EMC / EP (volume ratio 1:2:2, weight ratio is about 25:40:35) mixed solvent ConcentrationLiPF 6 solution. Test results such as figure 2 shown.

Embodiment III

[0062] Another battery is prepared according to the method of Example 1, the difference is that the electrolyte is 1 molar concentration LiPF in the mixed solvent of EC / EMC / EP (weight ratio is 3:5:2) 6 The solution. Test results such as image 3 shown.

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Abstract

The present invention provides a novel electrolyte solvent which is usable with a variety of carbonaceous and metal oxide electrode active materials, providing improved performance over a broad temperature range, and which is stabilized to maintain cell capacity over a number of cycles.

Description

field of invention [0001] The present invention relates to electrolyte solutions for use as a source of alkali metal ions to provide ion mobility and conductivity. More specifically, the present invention relates to electrolyte cells in which the electrolyte serves as an ion-conducting pathway between electrodes. background of the invention [0002] The electrolyte is an essential part of an electrolytic cell or battery. In one arrangement, the battery contains an intermediate separator containing an electrolyte through which lithium ions from a source electrode material migrate between the two electrodes of the battery during discharge / charge cycles of the battery. The invention is particularly useful in the manufacture of batteries in which the ion source electrode is a lithium compound or other material capable of intercalating lithium ions, and in which the electrode separator uses a polymer matrix which provides the possibility of ion mobility by infiltration. It has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/587H01M10/0565H01M10/0569H01M50/426
CPCY02E60/12H01M4/587H01M2/1653H01M10/0569H01M10/0565Y02E60/10H01M50/426
Inventor J·巴克高峰A·施图克斯
Owner VALENCE TECH INC