Choi Jin-Hoon, Ryu Won-Hee, Park Kyusung, Jo Jeong-Dai, Jo Sung-Moo, Lim Dae-Soon, Kim Il-Doo
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.
Department of Materials Science &Engineering, Korea Advanced Institute of Science &Technology, 335 Science Road, Daejeon 305-701, Republic of Korea.
Sci Rep. 2014 Dec 5;4:7334. doi: 10.1038/srep07334.
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.
据报道，夹在石墨烯纳米片（GNSs）和单壁碳纳米管（SWCNTs）网络之间的自聚集Li4Ti5O12颗粒是用于高功率锂离子电池的新型混合电极。多层电极通过以下顺序工艺制备：首先空气喷涂GNSs层，然后对分散良好的胶体Li4Ti5O12纳米颗粒进行静电喷涂（E-spray），随后再次空气喷涂SWCNTs层。在GNSs/纳米多孔Li4Ti5O12聚集体/SWCNTs网络的多层电极中，GNSs和SWCNTs作为导电桥，有效地交织纳米多孔Li4Ti5O12聚集体，并通过在无粘结剂的情况下紧密固定Li4Ti5O12，帮助实现优异的倍率性能以及提高复合电极的机械稳定性。多层电极在100C的高倍率下，即使经过1000次循环，仍能提供高达100 mA h g(-1)的比容量，保持令人印象深刻的高容量。
