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1. (WO2017151497) ELECTROLYTE FORMULATIONS FOR LITHIUM ION CAPACITORS

Pub. No.:    WO/2017/151497    International Application No.:    PCT/US2017/019669
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Tue Feb 28 00:59:59 CET 2017
IPC: H01G 11/60
H01G 11/06
H01G 11/62
H01G 11/64
Applicants: MAXWELL TECHNOLOGIES, INC.
Inventors: RAMAN, Santhanam
XI, Xiaomei
YE, Xiang-Rong
HONG, Jian
Title: ELECTROLYTE FORMULATIONS FOR LITHIUM ION CAPACITORS
Abstract:
A lithium ion capacitor including a cathode, an anode, and a separator between the cathode and the anode, and an electrolyte comprising a solvent, a lithium salt and one or more additives selected from the group consisting of vinylene carbonate (VC), vinyl ethylene carbonate (VEC), dimethylacetamide (DMAc), hydro fluorinated ether branched cyclic carbonate, a hydro fluorinated ether ethylene carbonate (HFEEC), hydro fluorinated ether (HFE), and fluorinated ethylene carbonate (FEC). The electrolyte may include a carbonate based solvent and one or more solvent components and/or one or more of vinylene carbonate (VC), vinyl ethylene carbonate (VEC), dimethylacetamide (DMAc), hydro fluorinated ether branched cyclic carbonate, a hydro fluorinated ether ethylene carbonate (HFEEC), hydro fluorinated ether (HFE), and fluorinated ethylene carbonate (FEC). Further, the lithium salt is LiPF6. The figure is a graph showing cyclic voltammetry measured at the anode of a lithium ion capacitor cycled at a temperature of about 65 °C, where the lithium ion capacitor including an electrolyte having the following composition: 1.2 Molar (M) of LiPF6 in EC-PC-DEC (ethylene carbonate - propylene carbonate - diethylcarbonate) solvent.