Synthesis and electrochemical studies of nano-scale carbon-coated LiFePO4 electrodes for Li-ion batteries.
Regardless of high capacity and stability during lithium extraction, LiFePO4 materials have difficulty in the applications for high electrical density because of low electrical conductivities. In order to optimize this problem, we synthesized carbon coated LiFePO4 by adding humic acid using solid state reaction method. We characterized the synthesized compounds via the crystallinity, the valence states of Fe ions, and their shapes. We found the carbon coating using X-ray photoelectron spectroscopy (XPS) and transmission electron microscope (TEM). We also found that the iron ion is substituted from 3+ to 2+ through XPS measurement. We showed that the carbon coating increased the electrochemical behavior by measuring the charge-discharge characteristics.
Jeong
Euh Duck
ED
High-Technology Components and Materials Research Center, Korea Basic Science Institute, Pusan 618-230, Korea.
Kim
Hye Jin
HJ
Ahn
Chang Won
CW
Ha
Myoung Gyu
MG
Hong
Tae Eun
TE
Kim
Hyun Gyu
HG
Jin
Jong Sung
JS
Bae
Jong Sung
JS
Hong
K S
KS
Kim
Yang-Soo
YS
Kim
Hae-Jin
HJ
Doh
C H
CH
Yang
H S
HS