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1.
Facile Fabrication of Bicomponent CoO/CoFe2O4‐N‐Doped Graphene Hybrids with Ultrahigh Lithium Storage Capacity 下载免费PDF全文
Changtai Zhao Chang Yu Shaohong Liu Juan Yang Xiaoming Fan Jieshan Qiu 《Particle & Particle Systems Characterization》2015,32(1):91-97
A facile strategy is developed to fabricate bicomponent CoO/CoFe2O4‐N‐doped graphene hybrids (CoO/CoFe2O4‐NG). These hybrids are demonstrated to be potential high‐performance anodes for lithium‐ion batteries (LIBs). The CoO/CoFe2O4 nanoplatelets are finely dispersed on the surface of N‐doped graphene nanosheets (CoO/CoFe2O4‐NG). The CoO/CoFe2O4‐NG electrode exhibits ultrahigh specific capacity with 1172 mA h g?1 at 500 mA g?1 and 970 mA h g?1 at 1000 mA g?1 as well as excellent cycle stability due to the synergetic effects of N‐doped graphene and CoO/CoFe2O4 nanoplatelets. The well‐dispersed bicomponent CoO/CoFe2O4 is responsible for the high specific capacity. The N‐doped graphene with high specific surface area has dual roles: to provide active sites for dispersing the CoO/CoFe2O4 species and to function as an electrical conducting matrix for fast charge transfer. This method provides a simple and efficient way to configure the hybridized electrode materials with high lithium storage capacity. 相似文献
2.
Encapsulating Tin Dioxide@Porous Carbon in Carbon Tubes: A Fiber‐in‐Tube Hierarchical Nanostructure for Superior Capacity and Long‐Life Lithium Storage 下载免费PDF全文
Yuan Liu Jin‐Le Lan Qing Cai Yun‐Hua Yu Yuan‐Hua Lin Xiao‐Ping Yang 《Particle & Particle Systems Characterization》2015,32(10):952-961
A novel fiber‐in‐tube hierarchical nanostructure of SnO2@porous carbon in carbon tubes (SnO2@PC/CTs) is creatively designed and synthesized though a carbon coating on scalable electrospun hybrid nanofibers template and a post‐etching technique. This 1D nanoarchitecture consists of double carbon‐buffering matrixes, i.e., the external carbon tubular shell and the internal porous carbon skeleton, which can work synergistically to address the various issues of SnO2 nanoanode operation, such as pulverization, particle aggregation, and vulnerable electrical contacts between the SnO2 nanoparticles and the carbon conductors. Thus, the as‐obtained SnO2@PC/CTs nanohybrids used as a lithium‐ion‐battery anode exhibits a higher reversible capacity of 1045 mA h g?1 at 0.5 A g?1 after 300 cycles as well as a high‐rate cycling stability after 1000 cycles. The enhanced performance can be attributed to the wonderful merits of the external carbon protective shell for preserving the integrity of the overall electrode, and the internal porous carbon skeleton for inhibiting the aggregation and electrical isolation of the active particles during cycling. 相似文献