锂离子电池正极材料xLi2MnO3·(1-x)Li[Ni1/3Mn1/3Co1/3]O2的制备及表征

doi:10.3866/PKU.WHXB201202102

Abstract

Abstract: The lithium rich cathode materials xLi₂MnO₃·(1-x)Li[Ni_1/3Mn_1/3Co_1/3]O₂ (x=0.4, 0.5, 0.6) were successfully synthesized via sol-gel method with calcination in air. The transition metal acetate, lithium acetate, and citric acid were used as raw materials. The as-prepared materials were characterized by X-ray diffraction (XRD), scaning electron microscopy (SEM), and electrochemical tests. The material 0.5Li₂MnO₃·0.5LiNi_1/3Mn_1/3Co_1/3]O₂, which was obtained after calcination at 900 °C for 12 h, exhibited fine microstructures and good electrochemical performance. When cycled at 2.0-4.8 V with a current density of 20 mA·g^-1 at room temperature, 0.5Li₂MnO₃·0.5LiNi_1/3Mn_1/3Co_1/3]O₂ delivered a initial discharge specific capacity of 260.0 mAh·g^-1, and maintained a capacity of 244.7 mAh·g^-1 after 40 cycles (capacity retention 94.12%).

Key words: Lithium-ion battery, Sol-gel, Solid solution, Cathode material, Electrochemical performance

MSC2000:

锂离子电池

WANG Zhao, WU Feng, SU Yue-Feng, BAO Li-Ying, CHEN Lai, LI Ning, CHEN Shi. Preparation and Characterization of xLi₂MnO₃·(1-x)Li[Ni_1/3Mn_1/3Co_1/3]O₂ Cathode Materials for Lithium-Ion Batteries[J].Acta Phys. -Chim. Sin., 2012, 28(04): 823-830.

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Preparation and Characterization of xLi₂MnO₃·(1-x)Li[Ni_1/3Mn_1/3Co_1/3]O₂ Cathode Materials for Lithium-Ion Batteries

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Preparation and Characterization of xLi2MnO3·(1-x)Li[Ni1/3Mn1/3Co1/3]O2 Cathode Materials for Lithium-Ion Batteries

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Preparation and Characterization of xLi₂MnO₃·(1-x)Li[Ni_1/3Mn_1/3Co_1/3]O₂ Cathode Materials for Lithium-Ion Batteries