ELECTROLYTE ADDITIVES FOR LITHIUM ION BATTERIES

Improved nonaqueous electrolytes have been developed for lithium ion batteries. The electrolytes comprises a lithium salt, a nonaqueous carbonate solvent, and an additive mixture comprising at least one group A compound, at least one group B compound, and at least one group C compound wherein the gr...

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Bibliographische Detailangaben
Hauptverfasser:	PETIBON, Rémi, WANG, Yaohui, MA, Lin, DOWNIE, Laura, DAHN, Jeffrey R, NELSON, Kathlyne, XIA, Jian
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRICITY PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Beschreibung
Zusammenfassung:	Improved nonaqueous electrolytes have been developed for lithium ion batteries. The electrolytes comprises a lithium salt, a nonaqueous carbonate solvent, and an additive mixture comprising at least one group A compound, at least one group B compound, and at least one group C compound wherein the group A compound is selected from the group consisting of VC and PES, the group B compound is selected from the group consisting of MMDS, DTD, TMS, ES, and PS, and the group C compound is selected from the group consisting of TTSP and TTSPi. Certain ternary or quaternary additive mixtures can: reduce parasitic reactions at the positive electrode above 4.1 V compared to use of VC alone; increase the thermal stability of a charged graphite electrode at elevated temperature; improve coulombic efficiency; and also reduce impedance of the batteries. These factors all suggest longer lived, safer, higher power lithium batteries with better tolerance to high voltages which will improve energy density.