10.1021/acsami.5b11628.s001
So Yeun Kim
So Yeun
Kim
Jaewoo Lee
Jaewoo
Lee
Bo-Hye Kim
Bo-Hye
Kim
Young-Jun Kim
Young-Jun
Kim
Kap Seung Yang
Kap Seung
Yang
Min-Sik Park
Min-Sik
Park
Facile
Synthesis of Carbon-Coated Silicon/Graphite
Spherical Composites for High-Performance Lithium-Ion Batteries
American Chemical Society
2016
capacity retention
Si nanoparticles
mass production
cycle performance
Facile Synthesis
electrochemical reaction
100 cycles
carbon layer encapsulating Si nanoparticles
storage capability
multicomponent structure
2016-04-26 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Facile_Synthesis_of_Carbon_Coated_Silicon_Graphite_Spherical_Composites_for_High_Performance_Lithium_Ion_Batteries/3363727
A high-performance
Si/carbon/graphite composite in which Si nanoparticles
are attached onto the surface of natural graphite by carbonization
of coal-tar pitch is proposed for use in lithium-ion batteries. This
multicomponent structure is favorable for improving Li<sup>+</sup> storage capability because the amorphous carbon layer encapsulating
Si nanoparticles offers sufficient electric conductivity and strong
elasticity to facilitate relaxation of strain caused by electrochemical
reaction of Si during cycles. The Si/carbon/graphite composite exhibits
a specific capacity of 712 mAh g<sup>–1</sup> at a constant
current density of 130 mA g<sup>–1</sup>, and maintains more
than 80% of its initial capacity after 100 cycles. Moreover, it shows
a high capacity retention of approximately 88% even at a high current
density of 5 C (3250 mA g<sup>–1</sup>). On the basis of electrochemical
and structural analyses, we suggest that a rational design of the
Si/carbon/graphite composite is mainly responsible for delivering
a high reversible capacity and stable cycle performance. Furthermore,
the proposed synthetic route for the Si/carbon/graphite composite
is simple and cost-effective for mass production.