Hybrid Cellular Nanosheets for High-Performance Lithium-Ion Battery Anodes.
We report a simple synthetic method of carbon-based hybrid cellular nanosheets that exhibit outstanding electrochemical performance for many key aspects of lithium-ion battery electrodes. The nanosheets consist of close-packed cubic cavity cells partitioned by carbon walls, resembling plant leaf tissue. We loaded carbon cellular nanosheets with SnO2 nanoparticles by vapor deposition method and tested the performance of the resulting SnO2-carbon nanosheets as anode materials. The specific capacity is 914 mAh g(-1) on average with a retention of 97.0% during 300 cycles, and the reversible capacity is decreased by only 20% as the current density is increased from 200 to 3000 mA g(-1). In order to explain the excellent electrochemical performance, the hybrid cellular nanosheets were analyzed with cyclic voltammetry, in situ X-ray absorption spectroscopy, and transmission electron microscopy. We found that the high packing density, large interior surface area, and rigid carbon wall network are responsible for the high specific capacity, lithiation/delithiation reversibility, and cycling stability. Furthermore, the nanosheet structure leads to the high rate capability due to fast Li-ion diffusion in the thickness direction.
Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 151-742, Republic of Korea.
Seung-Ho
SH
Yu
Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 151-742, Republic of Korea.
Dong Jun
DJ
Lee
Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 151-742, Republic of Korea.
Mihyun
M
Park
Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 151-742, Republic of Korea.
Soon Gu
SG
Kwon
Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 151-742, Republic of Korea.
Hyeon Seok
HS
Lee
Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 151-742, Republic of Korea.
Aihua
A
Jin
Beamline Department, Pohang Accelerator Laboratory (PAL) , Pohang 790-784, Republic of Korea.
Kug-Seung
KS
Lee
Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 151-742, Republic of Korea.|Creative and Fundamental Research Division, Korea Electrotechnology Research Institute (KERI) , Changwon 641-120, Republic of Korea.
Ji Eun
JE
Lee
Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 151-742, Republic of Korea.
Myoung Hwan
MH
Oh
Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 151-742, Republic of Korea.
Kisuk
K
Kang
Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 151-742, Republic of Korea.
Yung-Eun
YE
Sung
Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 151-742, Republic of Korea.
Taeghwan
T
Hyeon