Synthesis and cycling performance of double metal doped LiMn2O4 cathode materials for rechargeable lithium ion batteries

• Published in: Inorganic materials Vol. 44; no. 4; pp. 420 - 425
• Main Authors: Şahan, H., Göktepe, H., Patat, Ş.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01-04-2008
• Subjects: Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Materials Science; Cycling Performance; Discharge Capacity; Solid State Ionic; Cathode Material; Initial Discharge Capacity
• ISSN: 0020-1685; 1608-3172
• DOI: 10.1134/S0020168508040171

In order to improve the cycling performance of LiMn
2
O
4
, the spinel phases LiCo
0.15
Mn
1.85
O
4
and LiCo
0.05
M
0.1
Mn
1.85
O
4
(M = Ni, Zn, Cu) were prepared by the sol-gel method. Their structures have been investigated by x-ray diffraction. Electrochemical studies were carried out using the Li | Li
x
Mn
2
O
4
(
x
= 1.05, 1.1), LiCo
0.15
Mn
1.85
O
4
, and LiCo
0.05
M
0.1
Mn
1.85
O
4
(M = Ni, Zn, Cu) cells. The capacity loss of Li | Li
x
Mn
2
O
4
(
x
= 1.05, 1.1) cells is about 21.7 and 6.4% after 30 cycles, whereas that for Co, Co-Ni, Co-Zn, and Co-Cu doped spinel materials is about 4.0, 2.0, 1.0, and 1.9%, respectively. The good capacity retention of LiCo
0.05
M
0.1
Mn
1.85
O
4
(M = Ni, Zn, Cu) electrodes is attributed to stabilization of spinel structure by double metal doping for Mn ion sites. Double substituted spinels display better performance in terms of cycle-life compared with LiMn
2
O
4
.