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Electrolyte solutions for high energy cathode materials and methods of use thereof

A technology of electrolyte and cathode, which is applied in the field of additive compounds and storage batteries, and can solve problems such as cycle life degradation

Active Publication Date: 2017-06-30
WILDCAT DISCOVERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, above about 4.3V, conventional electrolytes degrade, and this leads to a significant degradation in cycle life

Method used

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  • Electrolyte solutions for high energy cathode materials and methods of use thereof
  • Electrolyte solutions for high energy cathode materials and methods of use thereof
  • Electrolyte solutions for high energy cathode materials and methods of use thereof

Examples

Experimental program
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Embodiment

[0081] The battery cells were stored in a glove box filled with high-purity argon (M-Braun, O 2 and moisture content 0.33 mn 0.33 co 0.33 o 2 The cathode material was mixed with poly(vinylidene fluoride) (Sigma Aldrich) and carbon black (Super P Li, TIMCAL) with 1-methyl-2-pyrrolone (Sigma Aldrich) as solvent. The prepared slurry was deposited on an aluminum current collector and dried to form a composite anode film. (ii) For the anode, free carbon (G5) was mixed with poly(vinylidene fluoride) (Sigma Aldrich) and carbon black (Super P Li, TIMCAL), with 1-methyl-2-pyrrolidone (Sigma Aldrich) as a solvent. The prepared slurry was deposited on an aluminum current collector and dried to form a composite cathode film. Each battery cell included the composite cathode membrane, a polypropylene separator, and the composite anode membrane. A common electrolyte is mixed with a given electrolyte additive and added to a battery cell. The battery cells were sealed and cycled between...

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Abstract

Described are materials for electrolytes that when used in batteries provide a number of desirable properties such as high stability during battery cycling to high temperatures, high voltage, high discharge capacity, high Coulombic efficiency, and excellent discharge Capacitance retention and Coulombic efficiency after several charge-discharge cycles. In some embodiments, a high voltage electrolyte comprises a base electrolyte and a set of additive compounds that impart these desirable performance characteristics.

Description

[0001] Background of the invention [0002] The present invention relates to the field of battery technology and, more particularly, to the field of additive compounds for use with high energy electrodes in electrochemical cells. [0003] Electrolytes are used to transport ions and inhibit electrical contact between electrodes in a battery. Organic carbonate-based electrolytes are the most commonly used electrolytes in lithium-ion ("Li-ion") batteries, and in recent years, efforts have been made to develop new types of electrolytes based on sulfones, silanes, and nitriles. Unfortunately, these traditional electrolytes typically cannot operate at high voltages because they are not stable above 4.3V or at other high voltages. At high voltages, conventional electrolytes can decompose, for example, by catalytic oxidative decomposition in the presence of cathode materials to produce undesirable products that affect battery performance and safety. Conventional electrolytes can degra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/052H01M10/0565
CPCH01M4/505H01M4/525H01M4/587H01M10/0525H01M10/0567Y02E60/10Y02P70/50H01M10/052
Inventor 程岗李斌史蒂文·S·凯
Owner WILDCAT DISCOVERY TECH