Electrolyte solutions for high energy cathode materials and methods for use

An electrolyte and cathode technology used in batteries and additive compounds to solve problems such as cycle life degradation

Active Publication Date: 2015-11-11
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 for use
  • Electrolyte solutions for high energy cathode materials and methods for use
  • Electrolyte solutions for high energy cathode materials and methods for use

Examples

Experimental program
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Embodiment

[0077] The battery cells are 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 (SuperPLi, TIMCAL), and 1-methyl-2-pyrrolidone (Sigma Aldrich) was used as a solvent. The prepared slurry is 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 (SuperPLi, TIMCAL), using 1-methyl-2-pyrrolidone (Sigma Aldrich) as a solvent. The prepared slurry is deposited on an aluminum current collector and dried to form a composite cathode film. Each battery cell includes the composite cathode film, a polypropylene separator, and the composite anode film. The common electrolyte is mixed with the given electrolyte additive and added to the battery cell. The battery cell was sealed and cycled between 3V to 4.4...

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Abstract

Described herein are materials for use in electrolytes that provide a number of desirable characteristics when implemented within batteries, such as high stability during battery cycling up to high temperatures, high voltages, high discharge capacity, high coulombic efficiency, and excellent retention of discharge capacity and coulombic efficiency over several cycles of charging and discharging. In some embodiments, a high voltage electrolyte includes a base electrolyte and a set of additive compounds, which impart these desirable performance characteristics.

Description

Background of the invention [0001] The present invention relates to the technical field of batteries and, more specifically, to the field of additive compounds used with high-energy electrodes in electrochemical cells. [0002] The electrolyte is used to transfer ions and suppress electrical contact between the electrodes in the 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 sulfone, silane, and nitrile. Unfortunately, these traditional electrolytes typically cannot operate at high voltages because they are unstable above 4.3V or other high voltages. Under high voltage, traditional electrolytes can decompose, for example, by catalyzing oxidative decomposition in the presence of cathode materials to produce unsuitable products that affect battery performance and safety. When the battery is charged, the traditional el...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/052H01M10/0565
CPCH01M10/0567H01M4/505H01M4/525H01M4/587H01M10/0525Y02E60/122Y02P70/54Y02E60/10Y02P70/50H01M10/052
Inventor 程岗李斌史蒂文·S·凯
Owner WILDCAT DISCOVERY TECH
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