Electrochemical stability of core-shell structure electrode for high voltage cycling as positive electrode for lithium ion batteries

초록

The core-shell type cathode material Li[(Ni0.8Co0.1Mn0.1)(0.8)(Ni0.5Mn0.5)(0.2])O-2 (CS) for Li-ion battery was synthesized via co-precipitation method. The electrochemical and thermal properties of the core-shell structured Li[(Ni0.8Co0.1Mn0.1)(0.8)(Ni0.5Mn0.5)(0.2)]O-2 were compared with those of the average composition of core-shell Li[Ni0.74Co0.8Mn0.18]O-2 (ACCS) and the mixture of the core Li[Ni0.8Co0.1Mn0.1]O-2 and the shell Li[Ni0.5Mn0.5]O-2 material (MCS). The CS shows the enhanced electrochemical properties in a high voltage range (4.5 V and 4.6 V) as well as the typical cut-off voltage range (4.3 V). The capacity retentions of CS, core, and ACCS material were 94.2% (176.9 mAh g(-1)), 86.6% (172 mAh g(-1)), and 88.4% (169.3 mAh g(-1)) after 120 cycles, respectively.

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