Sn-modified LiNi0.9Co0.05Mn0.05O2 cathode with extraordinary electrochemical performances

초록

We report the synthesis of Sn-modified LiNi0.9Co0.05Mn0.05O2 cathode via a co-precipitation method. The key factor to enhance the electrochemical performances of lithium ion batteries is to suppress the structural reconstruction because of the irreversibility of the H2-H3 phase transition, resulting in rapid performance decay. The as-prepared Sn-modified LiNi0.9Co0.05Mn0.05O2 cathode delivers an initial discharge capacity of 221.4 mAh g.1 with a high coulombic efficiency of 88.5 %. Moreover, it shows better polarization of 0.33 V and superior cycle stability of 98.8% after 58 cycles. These values are obviously higher than those of pristine LiNi0.9Co0.05Mn0.05O2 cathode. Therefore, we can believe that Sn-modified LiNi0.9Co0.05Mn0.05O2 cathode is one of the effective way for high-performance cathode material in lithium ion batteries.

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