The Johns Hopkins University

Jeremy D Walker

Rengaswamy Srinivasan

Marcia W Patchan

Jeffrey P Maranchi

Jennifer L Sample

Lance M Baird

Edward D Russell

Bliss G Carkhuff

Terry E Phillips

Michael H Butler

Oscar M Uy

Andrew C Baisden

Michael L Butler

A method of preparing a high capacity nanocomposite cathode of FeFin carbon pores may include preparing a nanoporous carbon precursor, employing electrochemistry or solution chemistry deposition to deposit Fe particles in the carbon pores, reacting nano Fe with liquid hydrofluoric acid to form nano FeFin carbon, and milling to achieve a desired particle size.

High energy density Li-ion battery electrode materials and cells

Methods and systems to determine an internal temperature of a rechargeable lithium-ion cell based on a phase shift of the cell. Internal cell temperature may be determined with respect to an internal anode temperature and/or an internal cathode temperature. Internal anode temperature may be determined based on a phase shift of a frequency within a range of approximately 40 Hertz (Hz) to 500 Hz. Internal cathode temperature may be determined based on a phase shift of a frequency of up to approximately 30 Hz. A temperature sensor as disclosed herein may be powered by a monitored cell with relatively little impact on cell charge, may be electrically coupled to cell but housed physically separate from the cell, and/or may monitor multiple cells in a multiplex fashion. A rate of change in phase shift may be used to initiate pre-emptive action, without determining corresponding temperatures.

Battery phase meter to determine internal temperatures of lithium-ion rechargeable cells under charge and discharge

Growing community of inventors

Washington, DC, United States of America

Jeremy D Walker