TY - JOUR
T1 - Novel approach to preparation of LiMn 2 O 4 core/LiNi x Mn 2-x O 4 shell composite
AU - Li, Xifei
AU - Xu, Youlong
AU - Wang, Chunlei
PY - 2009/3/15
Y1 - 2009/3/15
N2 - Combining two methods, coating and doping, to modify spinel LiMn 2 O 4 , is a novel approach we used to synthesize active material. First we coated the LiMn 2 O 4 particles with the nickel oxide particles by means of homogenous precipitation, and then the nickel oxide-coated LiMn 2 O 4 was calcined at 750 °C to form a LiNi x Mn 2-x O 4 shell on the surface of spinel LiMn 2 O 4 particles. Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), cyclic voltammetry (CV) and charge-discharge test were performed to characterize the spinel LiMn 2 O 4 before and after modification. The experimental results indicated that a spinel LiMn 2 O 4 core is surrounded by a LiNi x Mn 2-x O 4 shell. The resulting composite showed excellent electrochemical cycling performance with an average fading rate of 0.014% per cycle. This improved cycle stability is greatly attributed to the suppression of Jahn-Teller distortion on the surface of spinel LiMn 2 O 4 particles during cycling.
AB - Combining two methods, coating and doping, to modify spinel LiMn 2 O 4 , is a novel approach we used to synthesize active material. First we coated the LiMn 2 O 4 particles with the nickel oxide particles by means of homogenous precipitation, and then the nickel oxide-coated LiMn 2 O 4 was calcined at 750 °C to form a LiNi x Mn 2-x O 4 shell on the surface of spinel LiMn 2 O 4 particles. Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), cyclic voltammetry (CV) and charge-discharge test were performed to characterize the spinel LiMn 2 O 4 before and after modification. The experimental results indicated that a spinel LiMn 2 O 4 core is surrounded by a LiNi x Mn 2-x O 4 shell. The resulting composite showed excellent electrochemical cycling performance with an average fading rate of 0.014% per cycle. This improved cycle stability is greatly attributed to the suppression of Jahn-Teller distortion on the surface of spinel LiMn 2 O 4 particles during cycling.
KW - Core
KW - Jahn-Teller distortion
KW - Shell
KW - Spinel LiMn O
UR - https://www.scopus.com/pages/publications/60949101438
U2 - 10.1016/j.apsusc.2008.10.055
DO - 10.1016/j.apsusc.2008.10.055
M3 - 文章
AN - SCOPUS:60949101438
SN - 0169-4332
VL - 255
SP - 5651
EP - 5655
JO - Applied Surface Science
JF - Applied Surface Science
IS - 11
ER -