In Situ Measurements of Potential, Current and Charging Current across an EDL Capacitance Anode for an Aqueous Sodium Hybrid Battery

被引:9
作者
Hess, Katherine C. [1 ]
Whitacre, Jay F. [2 ,3 ]
Litster, Shawn [1 ]
机构
[1] Carnegie Mellon Univ, Dept Mech Engn, Pittsburgh, PA 15213 USA
[2] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA
[3] Carnegie Mellon Univ, Dept Engn & Publ Policy, Pittsburgh, PA 15213 USA
基金
美国国家科学基金会;
关键词
ACTIVATED CARBON; ENERGY-STORAGE; DOUBLE-LAYER; ELECTRODE; CELLS; NA4MN9O18;
D O I
10.1149/2.028208jes
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
This paper presents a novel method for obtaining in situ, through-thickness measurements of potential, current, charging current, and charge stored or discharged across capacitor and battery electrodes. Here we apply the method to an electrochemical double layer capacitance (EDLC) negative electrode for an aqueous sodium hybrid battery. In this approach, an electrode scaffold (ES) is used to directly measure the electric potential at discrete distances through the electrode under charging and discharging conditions. Finite difference methods are used to calculated local current and charging/discharging rates. The distributions obtained from these measurements are used to show non-uniform charging across an ultra-thick electrode intended for high area-specific energy storage in grid-scale energy storage applications. Using the ES we are able to gain insight into several complex phenomena that cannot be directly observed by other methods. For instance, we identify the portions of the electrode that are underutilized as well as the location of stray, parasitic currents. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.028208jes] All rights reserved.
引用
收藏
页码:A1351 / A1359
页数:9
相关论文
共 24 条
[1]  
[Anonymous], 2010, ENERGY STORAGE ELECT
[2]  
[Anonymous], 2012, CRC HDB
[3]  
Barnett B., 2010, P DOE VEH TECHN PROG
[4]  
Barnett B., 2009, P DOE VEH TECHN PROG
[5]   Optimized structure of nanoporous carbon-based double-layer capacitors [J].
Eikerling, M ;
Kornyshev, AA ;
Lust, E .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2005, 152 (01) :E24-E33
[6]   In-Situ Measurement of Oxygen Partial Pressure in a Cathode Catalyst Layer [J].
Epting, W. K. ;
Hess, K. C. ;
Litster, S. .
POLYMER ELECTROLYTE FUEL CELLS 10, PTS 1 AND 2, 2010, 33 (01) :1241-1249
[7]  
Gallagher K. G., 2011, P DOE VEH TECHN PROG
[8]   Direct in situ measurements of Li transport in Li-ion battery negative electrodes [J].
Harris, Stephen J. ;
Timmons, Adam ;
Baker, Daniel R. ;
Monroe, Charles .
CHEMICAL PHYSICS LETTERS, 2010, 485 (4-6) :265-274
[9]   Spatially Resolved, In Situ Potential Measurements through Porous Electrodes As Applied to Fuel Cells [J].
Hess, Katherine C. ;
Epting, William K. ;
Litster, Shawn .
ANALYTICAL CHEMISTRY, 2011, 83 (24) :9492-9498
[10]   What properties of grid energy storage are most valuable? [J].
Hittinger, Eric ;
Whitacre, J. F. ;
Apt, Jay .
JOURNAL OF POWER SOURCES, 2012, 206 :436-449