TY - JOUR
KW - Cathode
KW - Degradation
KW - Li-ion battery
KW - Raman microscopy
AU - Marie Kerlau
AU - Marek Marcinek
AU - Venkat Srinivasan
AU - Robert Kostecki
AB - <p>LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub> and LiNi<sub>1/3</sub>Co<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> composite cathodes were cycled in model cells to study interfacial phenomena that could lead to electrode degradation. <em>Ex situ</em> spectroscopic analysis of the tested cathodes, which suffered substantial power and capacity loss, showed that the state of charge (SOC) of oxide particles on the cathode surface was highly non-uniform despite the deep discharge of the Li-ion cell at the end of the test. The inconsistent kinetic behavior of individual oxide particles was attributed to the degradation of electronic pathways within the composite cathodes. A simple theoretical model based on a distributed network showed that an increase of the contact resistance between composite electrode particles may be responsible for non-uniform local kinetic behavior of individual oxide particles and the overall degradation of electrochemical performance of composite electrodes.</p>
BT - Electrochimica Acta
DA - 12/2007
DO - 10.1016/j.electacta.2007.10.009
IS - 3
LA - eng
LB - Batt
N1 - <p>INNOVATIVE ELECTROCHEMISTRY ENTERPRISING SCIENCE</p><p>Selection of papers from the 57th Annual Meeting of the International Society of Electrochemistry 27 August-1 September 2006, Edinburgh, UK</p>
N2 - <p>LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub> and LiNi<sub>1/3</sub>Co<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> composite cathodes were cycled in model cells to study interfacial phenomena that could lead to electrode degradation. <em>Ex situ</em> spectroscopic analysis of the tested cathodes, which suffered substantial power and capacity loss, showed that the state of charge (SOC) of oxide particles on the cathode surface was highly non-uniform despite the deep discharge of the Li-ion cell at the end of the test. The inconsistent kinetic behavior of individual oxide particles was attributed to the degradation of electronic pathways within the composite cathodes. A simple theoretical model based on a distributed network showed that an increase of the contact resistance between composite electrode particles may be responsible for non-uniform local kinetic behavior of individual oxide particles and the overall degradation of electrochemical performance of composite electrodes.</p>
PY - 2007
SP - 1385
EP - 1392
T2 - Electrochimica Acta
TI - Reprint of "Studies of local degradation phenomena in composite cathodes for lithium-ion batteries"
VL - 53
ER -