title: Cobalt oxide-carbon nanosheet nanoarchitecture as an anode for high-performance lithium-ion battery.
abstract: To improve the electrochemical performance of cobalt oxide owing to its inherent poor electrical conductivity and large volume expansion/contraction, Co3O4-carbon nanosheet hybrid nanoarchitectures were synthesized by a facile and scalable chemical process. However, it is still a challenge to control the size of Co3O4 particles down to ∼5 nm. Herein, we created nanosized cobalt oxide anchored 3D arrays of carbon nanosheets by the control of calcination condition. The uniformly dispersed Co3O4 nanocrystals on carbon nanosheets held a diameter down to ∼5 nm. When tested as anode materials for lithium-ion batteries, high lithium storage over 1200 mAh g(-1) is achieved, whereas high rate capability with capacity of about 390 mAh g(-1) at 10 A g(-1) is maintained through nanoscale diffusion distances and interconnected porous structure. After 500 cycles, the cobalt oxide-carbon nansheets hybrid display a reversible capacity of about 970 mAh g(-1) at 1 A g(-1). The synergistic effect between nanosized cobalt oxide and sheetlike interconnected carbon nanosheets lead to the greatly improved specific capacity and the initial Coulombic efficiency of the hybrids.
authors.affiliation: Institute of Materials Science and Engineering, Ocean University of China , Qingdao 266100, China.
authors.forename: Huanlei
authors.initials: H
authors.lastname: Wang
authors.forename: Nan
authors.initials: N
authors.lastname: Mao
authors.forename: Jing
authors.initials: J
authors.lastname: Shi
authors.forename: Qigang
authors.initials: Q
authors.lastname: Wang
authors.forename: Wenhua
authors.initials: W
authors.lastname: Yu
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
keywords: Li-ion battery; anode; cobalt oxide; electrochemistry; energy storage; hybrid