新型复合共沉淀法制备高能量/高功率型锂离子二次电池用5 V正极材料LiNi0.5Mn1.5O4及其电化学性能

doi:10.3866/PKU.WHXB201402102

Abstract

Abstract:

This research developed a novel composite co-precipitation method to prepare high performance LiNi_0.5Mn_1.5O₄ based on a traditional solid-state method. Ammonium oxalate/ammonium carbonate was used as a composite precipitator to deposit Ni/Mn ions. Combined with a facile hydrothermal treatment, stoichiometric LiNi_0.5Mn_1.5O₄ was obtained with a pure spinel structure and spherical hierarchical morphology. Electrochemical measurements indicate that the as-prepared LiNi_0.5Mn_1.5O₄ delivers a high capacity of 141.4 mAh·g^-1 and after 200 cycles under 0.3C, 1C, and 3C, the materials retained their capacities up to 96.3%, 94.4%, and 91.1%, respectively. Additionally, the capacity upon exposure to a low voltage of 4.0 V was efficiently eliminated by heat treatment and by a particular cooling process. Furthermore, the LiNi_0.5Mn_1.5O₄ materials with high energy and high power performances of 648.6 mWh·g^-1 and 7000mW·g^-1 were obtained because of different cation ordering.

Key words: Lithium ion battery, Spinel lithium nickel magnesium oxide, High energy/high power, Co-precipitation method, Spherical hierarchical morphology

ZHU Zhi, QI Lu, LI Wei, LIAO Xi-Ying. Preparation and Electrochemical Performance of 5 V LiNi_0.5Mn_1.5O₄ Cathode Material by the Composite Co-Precipitation Method for High Energy/High Power Lithium Ion Secondary Batteries[J]. Acta Phys. -Chim. Sin. 2014, 30(4), 669-676. doi: 10.3866/PKU.WHXB201402102

References

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Preparation and Electrochemical Performance of 5 V LiNi_0.5Mn_1.5O₄ Cathode Material by the Composite Co-Precipitation Method for High Energy/High Power Lithium Ion Secondary Batteries

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Preparation and Electrochemical Performance of 5 V LiNi0.5Mn1.5O4 Cathode Material by the Composite Co-Precipitation Method for High Energy/High Power Lithium Ion Secondary Batteries

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Preparation and Electrochemical Performance of 5 V LiNi_0.5Mn_1.5O₄ Cathode Material by the Composite Co-Precipitation Method for High Energy/High Power Lithium Ion Secondary Batteries