TY - GEN
T1 - Macroporous carbon nanotube (CNT) Foams as Li-Air battery cathodes
AU - Shen, Chao
AU - Liu, Teng
AU - Zhang, Mei
AU - Hendrickson, Mary A.
AU - Plichta, Edward J.
AU - Zheng, Jim P.
N1 - Publisher Copyright:
© 2017 The Electrochemical Society.
PY - 2017
Y1 - 2017
N2 - The cathode microstructure of Li-air battery plays a significant role in Li2O2 storage and electron transfer. Here we report a tunable three-dimensional (3D) hierarchically macroporous carbon nanotube (CNT) foam as an air cathode. Excellent electrochemical performance with a specific capacity over 10, 000 mAh g-1 was achieved, which can be attributed to a combination of sufficiently large tunnels for oxygen transport and an appropriate pore width for oxygen reduction in its pore structure. Also, an inverse correlation between the major pore size of carbon and cell capacity was observed experimentally and a simplified analytical model was proposed to explain this correlation. Based on a combined study of galvanostatic discharge, microscopy, porosimetry and modeling, we found that the discharge product Li2O2 was mainly deposited in micro-scale pores, while the reduced major pore size favored discharge reaction due to increased volume specific surface area.
AB - The cathode microstructure of Li-air battery plays a significant role in Li2O2 storage and electron transfer. Here we report a tunable three-dimensional (3D) hierarchically macroporous carbon nanotube (CNT) foam as an air cathode. Excellent electrochemical performance with a specific capacity over 10, 000 mAh g-1 was achieved, which can be attributed to a combination of sufficiently large tunnels for oxygen transport and an appropriate pore width for oxygen reduction in its pore structure. Also, an inverse correlation between the major pore size of carbon and cell capacity was observed experimentally and a simplified analytical model was proposed to explain this correlation. Based on a combined study of galvanostatic discharge, microscopy, porosimetry and modeling, we found that the discharge product Li2O2 was mainly deposited in micro-scale pores, while the reduced major pore size favored discharge reaction due to increased volume specific surface area.
UR - https://www.scopus.com/pages/publications/85030462165
U2 - 10.1149/07711.0239ecst
DO - 10.1149/07711.0239ecst
M3 - Conference contribution
AN - SCOPUS:85030462165
SN - 9781623324605
T3 - ECS Transactions
SP - 239
EP - 248
BT - Selected Proceedings from the 231st ECS Meeting New Orleans, LA - Spring 2017
PB - Electrochemical Society Inc.
T2 - 231st ECS Meeting
Y2 - 28 May 2017 through 1 June 2017
ER -