Frederick Joseph Krause

US Patent:

20120141883, Jun 7, 2012

Filed:

Feb 14, 2012

Appl. No.:

13/396322

Inventors:

Marshall C. Smart - Studio City CA, US
Ratnakuma V. Bugga - Arcadia CA, US
Surya G. Prakash - Hacienda Heights CA, US
Frederick C. Krause - Los Angeles CA, US

Assignee:

University of Southern California - Los Angeles CA
California Institute of Technology - Pasadena CA

International Classification:

H01M 10/052
H01M 10/056

US Classification:

429331, 429199, 429330

Abstract:

The invention discloses various embodiments of electrolytes for use in lithium-ion batteries, the electrolytes having improved safety and the ability to operate with high capacity anodes and high voltage cathodes. In one embodiment there is provided an electrolyte for use in a lithium-ion battery comprising an anode and a high voltage cathode. The electrolyte has a mixture of a cyclic carbonate of ethylene carbonate (EC) or mono-fluoroethylene carbonate (FEC) co-solvent, ethyl methyl carbonate (EMC), a flame retardant additive, a lithium salt, and an electrolyte additive that improves compatibility and performance of the lithium-ion battery with a high voltage cathode. The lithium-ion battery is charged to a voltage in a range of from about 2.0 V (Volts) to about 5.0 V (Volts).

US Patent:

20100047695, Feb 25, 2010

Filed:

Aug 18, 2009

Appl. No.:

12/543495

Inventors:

Marshall C. Smart - Studio City CA, US
Kiah A. Smith - Milwaukee WI, US
Ratnakumar V. Bugga - Arcadia CA, US
Surya G. Prakash - Hacienda Heights CA, US
Frederick Charles Krause - San Francisco CA, US

Assignee:

California Institute of Technology - Pasadena CA
University of Southern California - Los Angeles CA

International Classification:

H01M 6/18
H01M 6/16

US Classification:

429307, 429331

Abstract:

The invention discloses various embodiments of Li-ion electrolytes containing flame retardant additives that have delivered good performance over a wide temperature range, good cycle life characteristics, and improved safety characteristics, namely, reduced flammability. In one embodiment of the invention there is provided an electrolyte for use in a lithium-ion electrochemical cell, the electrolyte comprising a mixture of an ethylene carbonate (EC), an ethyl methyl carbonate (EMC), a fluorinated co-solvent, a flame retardant additive, and a lithium salt. In another embodiment of the invention there is provided an electrolyte for use in a lithium-ion electrochemical cell, the electrolyte comprising a mixture of an ethylene carbonate (EC), an ethyl methyl carbonate (EMC), a flame retardant additive, a solid electrolyte interface (SEI) film forming agent, and a lithium salt.

US Patent:

20160149263, May 26, 2016

Filed:

Nov 25, 2015

Appl. No.:

14/952493

Inventors:

- Holland MI, US
- Pasadena CA, US
Frederick C. Krause - Los Angeles CA, US
Bernhard M. Metz - Milwaukee WI, US
Ratnakumar V. Bugga - Arcadia CA, US

International Classification:

H01M 10/0568
H01M 2/02
H01M 4/485
H01M 10/0567
H01M 10/0525
H01M 10/0569

Abstract:

A lithium ion battery cell includes a housing, a cathode disposed within the housing, wherein the cathode comprises a cathode active material, an anode disposed within the housing, wherein the anode comprises an anode active material, and an electrolyte disposed within the housing and in contact with the cathode and anode. The electrolyte includes a solvent mixture and a lithium salt serving as a primary lithium ion conductor in the electrolyte to allow for lithium ion intercalation and deintercalation processes at the cathode and the anode during charging and discharging of the lithium ion battery cell. The solvent mixture includes a cyclic carbonate and one or more non-cyclic carbonates. The lithium salt is lithium bis(fluorosulfonyl)imide (LiFSI). The solvent mixture and LiFSI are configured to enhance the low temperature performance of the lithium ion battery cell at operating temperatures below 0 C.

US Patent:

20150221977, Aug 6, 2015

Filed:

Feb 4, 2015

Appl. No.:

14/614389

Inventors:

- Holland MI, US
- Pasadena CA, US
Frederick C. Krause - Los Angeles CA, US
Bernhard M. Metz - Milwaukee WI, US
Ratnakumar V. Bugga - Arcadia CA, US
Junwei Jiang - Whitefish Bay WI, US

International Classification:

H01M 10/0525
H01M 10/0569
H01M 10/0568
H01M 10/0567

Abstract:

A lithium ion battery cell includes a housing, a cathode disposed within the housing, wherein the cathode comprises a cathode active material, an anode disposed within the housing, wherein the anode comprises an anode active material, and an electrolyte disposed within the housing and in contact with the cathode and anode. The electrolyte consists essentially of a solvent mixture, a lithium salt in a concentration ranging from approximately 1.0 molar (M) to approximately 1.6 M, and an additive mixture. The solvent mixture includes a cyclic carbonate, an non-cyclic carbonate, and a linear ester. The additive mixture consists essentially of lithium difluoro(oxalato)borate (LiDFOB) in an amount ranging from approximately 0.5 wt % to approximately 2.0 wt % based on the weight of the electrolyte, and vinylene carbonate (VC) in an amount ranging from approximately 0.5 wt % to approximately 2.0 wt % based on the weight of the electrolyte.