XRD observation on fully-charged Li[LixMn2-y]O4 in nonaqueous lithium cells

被引：10
|
作者：
Iwata, M [1 ]
Takeda, S
Iwanaga, M
Ohzuku, T
机构：
[1] OCU, Grad Sch Engn, Dept Appl Chem, Sugimoto 3-3-138, Osaka 5588585, Japan
[2] Tosoh Corp, Technol Dev Dept, Yamaguchi 7468501, Japan
来源：
ELECTROCHEMISTRY | 2003年 / 71卷 / 12期
关键词：
manganese oxides; lithium cell; spinel; insertion materials;
D O I：
10.5796/electrochemistry.71.1187
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Li[LiyMn2-y]O-4 (0less than or equal toy<1/3) having a spinel-framework structure was prepared and examined in nonaqueous lithium cells in wide voltage range of 1.0 to 5.2 V. Li[LiyMn2-y]O-4 can be used as a positive electrode with rechargeable capacities of 50-120 mAh/g depending on y in Li[LiyMn2-y]O-4 for 4-volt class of lithium-ion batteries with a graphite negative-electrode. A redox signal at 5.0 V was observed for all samples except stoichiometric LiMn2O4. The X-ray examinations on the charged samples at 5.2 V vs. Li gave a structural parameter of 8.04-8.05 Angstrom regardless of y in Li [LiyMn2-y]O-4. In addition to the redox potentials of 3.0, 4.0 and 5.0 V, we found a redox potential of about 1.8 V at which one-phase reaction proceeded in a tetragonal phase.
引用
收藏
页码：1187 / 1191
页数：5
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