Visualization of Charge Distribution in a Lithium Battery Electrode

We describe a method for direct determination and visualization of the distribution of charge in a composite electrode. Using synchrotron X-ray microdiffraction, state-of-charge profiles in-plane and normal to the current collector were measured. In electrodes charged at high rate, the signatures of nonuniform current distribution were evident. The portion of a prismatic cell electrode closest to the current collector tab had the highest state of charge due to electronic resistance in the composite electrode and supporting foil. In a coin cell electrode, the active material at the electrode surface was more fully charged than that close to the current collector because the limiting factor in this case is ion conduction in the electrolyte contained within the porous electrode.

[1]  P. Gorostiza,et al.  Conductance maps by electrochemical tunneling spectroscopy to fingerprint the electrode electronic structure. , 2006, Analytical chemistry.

[2]  R. Dominko,et al.  Detection of highly conductive pathways in LiMn2O4–carbon black composites for Li ion batteries by microcontact impedance spectroscopy , 2004 .

[3]  John Newman,et al.  Potential and Current Distribution in Electrochemical Cells Interpretation of the Half‐Cell Voltage Measurements as a Function of Reference‐Electrode Location , 1993 .

[4]  Mark W. Verbrugge,et al.  Primary current distribution in a thin-film battery. Application to power-density calculations for lithium batteries , 1995 .

[5]  M. Verbrugge,et al.  Temperature and Current Distribution in Thin‐Film Batteries , 1999 .

[6]  J. R. Patel,et al.  Scanning X-ray microdiffraction with submicrometer white beam for strain/stress and orientation mapping in thin films. , 2003, Journal of synchrotron radiation.

[7]  Jan N. Reimers,et al.  Predicting current flow in spiral wound cell geometries , 2006 .

[8]  J. Tarascon,et al.  Comparison of Modeling Predictions with Experimental Data from Plastic Lithium Ion Cells , 1996 .

[9]  U. Kim,et al.  Effect of electrode configuration on the thermal behavior of a lithium-polymer battery , 2008 .

[10]  Guoying Chen,et al.  Continuity and performance in composite electrodes , 2010 .

[11]  K. S. Nanjundaswamy,et al.  Phospho‐olivines as Positive‐Electrode Materials for Rechargeable Lithium Batteries , 1997 .

[12]  V. Battaglia,et al.  Electrochemical modeling of lithium polymer batteries , 2002 .

[13]  J. Goodenough Challenges for Rechargeable Li Batteries , 2010 .

[14]  U. Kim,et al.  Modeling for the scale-up of a lithium-ion polymer battery , 2009 .

[15]  M. Armand,et al.  Building better batteries , 2008, Nature.

[16]  Gregory Y. Morrison,et al.  A dedicated superbend x-ray microdiffraction beamline for materials, geo-, and environmental sciences at the advanced light source. , 2009, The Review of scientific instruments.

[17]  Chee Burm Shin,et al.  A two-dimensional modeling of a lithium-polymer battery , 2006 .