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Studies of electrochemistry of lithium nickel cobalt oxide cathode materials for lithium-ion secondary battery
The LiNi0.8Co0.2O2 cathode material is considered to be used in commercial lithium-ion batteries for its high-capacity and low-cost, compared with that of LiCoO2 materials. In addition, the LiNi0.8Co0.2O2 has better thermal stability than LiNiO2. In this research LiNi0.8Co0.2O2 cathode material was synthesized by solid-state sintering method using various precursors. By SEM, XRD, charge-discharge test, cycle-life test and CV test, it is found that surface morphologies and electrochemical performance of the LiNi0.8Co0.2O2 powders were greatly influenced by various precursors. The surface morphologies of LiNi0.8Co0.2O2 particles with subgrains show higher discharge capacities and lower irreversible capacity losses at the first cycle. However, the fading rate increases significantly after a few cycles. This indicates that the surface morphologies of LiNi0.8Co0.2O2 particles have great influence on the electrochemical behavior of cathode materials.
|Appears in Collections:||材料科學與工程學系|
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