The possible improvements in structural stability and capacity of nickel–cobalt–aluminium cathode mate-rial were investigated by synthesizing this compound with various lithium amounts (Li$x$(Ni0.80Co0.15Al0.05)O2 where $x$ = 0.90, 0.95, 1.00 and 1.05). An ultrasound-assisted co-precipitation method was performed to produce spherical, nanosized powders with a narrow size distribution which satisﬁes a homogeneous and dense ﬁlm during calendaring. Lay-ered Li$x$(Ni0.80Co0.15Al0.05)O2 ($x$ = 0.90, 0.95, 1.00 and 1.05) cathode active materials were successfully synthesized with this method and chemical compositions of the powders synthesized were determined by inductively coupled plasma-mass spectroscopy. Structural characterization was carried out via X-ray diffraction and scanning electron microscopy techniques. The electrochemical properties of the cathode materials were investigated by electrochemical impedance spec-troscopy, galvanostatic charge/discharge and cyclic voltammetry methods. Among the cathode compositions in the currentstudy, Li1.05(Ni0.80Co0.15Al0.05)O2 exhibited the highest capacity, 138 mAh g⁻¹ with 95% capacity retention upon 22 cycles.
Volume 42 | Issue 6
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