TY - JOUR
T1 - Optimization of Inactive Material Content in Lithium Iron Phosphate Electrodes for High Power Applications
AU - Ha, Seonbaek
AU - Ramani, Vijay K.
AU - Lu, Wenquan
AU - Prakash, Jai
N1 - Publisher Copyright:
© 2016 Elsevier Ltd. All rights reserved.
PY - 2016/2/10
Y1 - 2016/2/10
N2 - The electrochemical performance of lithium iron phosphate (LiFePO4) electrodes has been studied to find the optimum content of inactive materials (carbon black + polyvinylidene difluoride [PVDF] polymer binder) and to better understand electrode performance with variation in electrode composition. Trade-offs between inactive material content and electrochemical performance have been characterized in terms of electrical resistance, rate-capability, area-specific impedance (ASI), pulse-power characterization, and energy density calculations. The ASI and electrical conductivity were found to correlate well with ohmic polarization. The results showed that a 80:10:10 (active material: binder: carbon agents) electrode had a higher pulse-power density and energy density at rates above 1C as compared to 90:5:5, 86:7:7 and 70:15:15 formulations, while the 70:15:15 electrode had the highest electrical conductivity of 0.79 S cm-1. A CB/PVDF ratio of ca. 1.22 was found to be the optimum formulation of inactive material when the LiFePO4 composition was 80 wt%.
AB - The electrochemical performance of lithium iron phosphate (LiFePO4) electrodes has been studied to find the optimum content of inactive materials (carbon black + polyvinylidene difluoride [PVDF] polymer binder) and to better understand electrode performance with variation in electrode composition. Trade-offs between inactive material content and electrochemical performance have been characterized in terms of electrical resistance, rate-capability, area-specific impedance (ASI), pulse-power characterization, and energy density calculations. The ASI and electrical conductivity were found to correlate well with ohmic polarization. The results showed that a 80:10:10 (active material: binder: carbon agents) electrode had a higher pulse-power density and energy density at rates above 1C as compared to 90:5:5, 86:7:7 and 70:15:15 formulations, while the 70:15:15 electrode had the highest electrical conductivity of 0.79 S cm-1. A CB/PVDF ratio of ca. 1.22 was found to be the optimum formulation of inactive material when the LiFePO4 composition was 80 wt%.
KW - area specific impedance
KW - electrode optimization
KW - four-point probe conductivity
KW - LiFePO
KW - lithium ion batteries
UR - https://www.scopus.com/pages/publications/84955497049
U2 - 10.1016/j.electacta.2016.01.049
DO - 10.1016/j.electacta.2016.01.049
M3 - Article
AN - SCOPUS:84955497049
SN - 0013-4686
VL - 191
SP - 173
EP - 182
JO - Electrochimica Acta
JF - Electrochimica Acta
ER -