Multi-layer electrode with nano-Li4Ti5O12 aggregates sandwiched between carbon nanotube and graphene networks for high power Li-ion batteries

Jin-Hoon Choi; Won-Hee Ryu; Kyusung Park; Jeong-Dai Jo; Sung-Moo Jo; Dae-Soon Lim; Il-Doo Kim

doi:10.1038/srep07334

Multi-layer electrode with nano-Li4Ti5O12 aggregates sandwiched between carbon nanotube and graphene networks for high power Li-ion batteries

Sci Rep. 2014 Dec 5:4:7334. doi: 10.1038/srep07334.

Authors

Jin-Hoon Choi¹, Won-Hee Ryu², Kyusung Park³, Jeong-Dai Jo⁴, Sung-Moo Jo⁵, Dae-Soon Lim⁶, Il-Doo Kim²

Affiliations

¹ 1] Department of Materials Science &Engineering, Korea Advanced Institute of Science &Technology, 335 Science Road, Daejeon 305-701, Republic of Korea [2] Carbon Convergence Materials Research Division, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea [3] Department of Materials Science and Engineering, Korea University, Seoul 136-713, Republic of Korea.
² Department of Materials Science &Engineering, Korea Advanced Institute of Science &Technology, 335 Science Road, Daejeon 305-701, Republic of Korea.
³ Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States.
⁴ Intelligence and Precision Machinery Research Division, Korea Institute of Machinery and Materials, Daejeon, 305-343, Republic of Korea.
⁵ Carbon Convergence Materials Research Division, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea.
⁶ Department of Materials Science and Engineering, Korea University, Seoul 136-713, Republic of Korea.

Abstract

Self-aggregated Li4Ti5O12 particles sandwiched between graphene nanosheets (GNSs) and single-walled carbon nanotubes (SWCNTs) network are reported as new hybrid electrodes for high power Li-ion batteries. The multi-layer electrodes are fabricated by sequential process comprising air-spray coating of GNSs layer and the following electrostatic spray (E-spray) coating of well-dispersed colloidal Li4Ti5O12 nanoparticles, and subsequent air-spray coating of SWCNTs layer once again. In multi-stacked electrodes of GNSs/nanoporous Li4Ti5O12 aggregates/SWCNTs networks, GNSs and SWCNTs serve as conducting bridges, effectively interweaving the nanoporous Li4Ti5O12 aggregates, and help achieve superior rate capability as well as improved mechanical stability of the composite electrode by holding Li4Ti5O12 tightly without a binder. The multi-stacked electrodes deliver a specific capacity that maintains an impressively high capacity of 100 mA h g(-1) at a high rate of 100C even after 1000 cycles.

Publication types

Research Support, Non-U.S. Gov't