锌掺杂提高LiNi1/3Co1/3Mn1/3O2正极材料的电化学稳定性

doi:10.3866/PKU.WHXB201205152

Abstract

Abstract:

Highly stable Li(Ni_1/3Co_1/3Mn_1/3)_1-xZn_xO₂ (x=0, 0.02, 0.05) cathode materials doped with Zn are synthesized by solid-state reactions with co-precipitated precursors. Cyclic voltammetry (CV) curves reveal that the potential difference between oxidation and reduction decreases to 0.09 V, and from electrochemical impedance spectra (EIS) curves, the impedance of LiNi_1/3Co_1/3Mn_1/3O₂ cathode materials is reduced from 266 to 102 Ω. The diffusion coefficients of Li⁺ ions in intercalation processes increase from 1.20×10^-11 to 2.54×10^-11 cm²·s^-1. Li(Ni_1/3Co_1/3Mn_1/3)_0.98Zn_0.02O₂ is stable at 0.3C (constant charge/discharge) at a high cut-off potential of 4.6 V vs Li/Li⁺. It has a second discharge capacity of 176.2 mAh·g^-1 at 0.3C and 142 mAh·g^-1 at 3C, and keep almost no decay after 100 cycles at room temperature. Furthermore, its average capacity loss per cycle at 55 °C is 0.20%, which is lower compared with 0.54% for LiNi_1/3Co_1/3Mn_1/3O₂ and 0.38% for Li(Ni_1/3Co_1/3Mn_1/3)_0.95Zn_0.05O₂ after 100 cycles. The improved electrochemical stability of Zn-doped LiNi_1/3Co_1/3Mn_1/3O₂ is attributed to the reduced electrode polarization and impedance values, and an increased Li+ ion diffusion coefficient.

Key words: Lithium nickel cobalt manganese oxide, High cut-off voltage, Zn-doping, Cathode material, Lithium ion battery

MSC2000:

O646

LI Jie-Bin, XU You-Long, DU Xian-Feng, SUN Xiao-Fei, XIONG Li-Long. Improved Electrochemical Stability of Zn-Doped LiNi_1/3Co_1/3Mn_1/3O₂ Cathode Materials[J].Acta Phys. -Chim. Sin., 2012, 28(08): 1899-1905.

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Improved Electrochemical Stability of Zn-Doped LiNi_1/3Co_1/3Mn_1/3O₂ Cathode Materials

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