Corresponding Author

Yong YANG(yyang@xmu.edu.cn)


In order to investigate the effects of Al-doping on the structure, morphology and electrochemical performance of Ni-rich layered oxides, the NCA cathode materials with a nominal chemical formula of LiNi0.8Co0.15Al0.05O2 were prepared by two methods with different aluminum sources. One was the solid phase method: the precursor (Ni0.84Co0.16(OH)2) prepared by co-precipitation was mixed with lithium and aluminum source (nano-Al2O3 or Al(NO3)3) thoroughly, and calcined at 780 ℃ for 15 h under an oxygen atmosphere. The other was the co-precipitation method: the NCA precursor (Ni0.8Co0.15Al0.05(OH)2.05) was synthesized by co-pre- cipitation method employing either Al2(SO4)3 or NaAlO2 as an aluminum source, and the NCA precursor was then mixed with lithium source and sintered at 780 ℃ for 15 h under an oxygen atmosphere. The results showed that Al-doping reduced the degree of cation mixing and maintained the stability of the layered structure, thereby reducing the voltage drop and improving its cycle performance. The NCA material prepared by co-precipitation method employing NaAlO2 as the aluminum source revealed the morphology of dense microspheres with a uniform size distribution and a well-layered structure of low Ni2+/Li+ mixing, acheving the best performance. The as-prepared NCA cathode material delivered a high discharge capacity (198 mAh·g-1 at 0.1C) corresponding to 94.6% coulombic efficiency and good cycle stability (a capacity retention of 70% after 200 cycles at 1C) between 3.0 V and 4.3 V.

Graphical Abstract


Lithium-ion battery, co-precipitation method, Ni-rich cathode; LiNi0.8Co0.15Al0.05O2, doping

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