|Title||Preparation and Characterization of Li1.05[Ni0.35Co0.25Mn0.4]O2 as a Cathode Material for Rechargeable Lithium Cells|
|Publication Type||Journal Article|
|Year of Publication||2006|
|Authors||Jong-Tae Son, Elton J Cairns|
|Journal||Electrochemical and Solid-State Letters|
|Keywords||cathodes, lithium compounds, secondary cells, sol-gel processing, x-ray diffraction|
A lithium insertion material Li1.05[Ni0.35Co0.25Mn0.4]O2 was synthesized by a sol-gel method. The structural and electrochemical properties of the sample were investigated using X-ray diffraction spectroscopy (XRD) and the galvanostatic charge-discharge method. Rietveld analysis of the XRD patterns shows this compound as having the α-NaFeO2 structure (R3m; a = 2.8670(4) Å, and 14.279(3) Å in hexagonal setting). Li1.05[Ni0.35Co0.25Mn0.4]O2 has a discharge capacity of 164 mAh/g in the voltage range 2.8-4.5 V vs Li/Li+, a stable capacity on cycling, and good rate capability in the current range 0.1-4.0 C. When the voltage range is increased to 2.8-4.8 V, it yields a capacity of 187 mAh/g, but exhibits a significant loss of capacity during cycling. The results indicate that this novel cathode material should be useful for lithium-ion cells because it has a lower cost than LiCoO2-containing cells, and high performance.
|Short Title||Electrochem. Solid-State Lett.|