title: 3D macroporous electrode and high-performance in lithium-ion batteries using SnO2 coated on Cu foam.
abstract: A three-dimensional porous architecture makes an attractive electrode structure, as it has an intrinsic structural integrity and an ability to buffer stress in lithium-ion batteries caused by the large volume changes in high-capacity anode materials during cycling. Here we report the first demonstration of a SnO2-coated macroporous Cu foam anode by employing a facile and scalable combination of directional freeze-casting and sol-gel coating processes. The three-dimensional interconnected anode is composed of aligned microscale channels separated by SnO2-coated Cu walls and much finer micrometer pores, adding to surface area and providing space for volume expansion of SnO2 coating layer. With this anode, we achieve a high reversible capacity of 750 mAh g(-1) at current rate of 0.5 C after 50 cycles and an excellent rate capability of 590 mAh g(-1) at 2 C, which is close to the best performance of Sn-based nanoscale material so far.
authors.affiliation: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea.|Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Cellmotive Co. Ltd., #518, Eng. Bldg., Kookmin University, Seoul 136-702, Republic of Korea.
authors.forename: Ji Hyun
authors.initials: JH
authors.lastname: Um
authors.affiliation: School of Advanced Materials Engineering, Kookmin University, Seoul 136-702, Republic of Korea.
authors.forename: Myounggeun
authors.initials: M
authors.lastname: Choi
authors.affiliation: School of Advanced Materials Engineering, Kookmin University, Seoul 136-702, Republic of Korea.
authors.forename: Hyeji
authors.initials: H
authors.lastname: Park
authors.affiliation: Department of Chemical Engineering, Kangwon National University, Samcheok 245-711, Republic of Korea.
authors.forename: Yong-Hun
authors.initials: YH
authors.lastname: Cho
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA.
authors.forename: David C
authors.initials: DC
authors.lastname: Dunand
authors.affiliation: School of Advanced Materials Engineering, Kookmin University, Seoul 136-702, Republic of Korea.
authors.forename: Heeman
authors.initials: H
authors.lastname: Choe
authors.affiliation: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Republic of Korea.|Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.
authors.forename: Yung-Eun
authors.initials: YE
authors.lastname: Sung