High tap density of Ni3(PO4)2 coated LiNi1/3Co1/3Mn1/3O2 with enhanced cycling performance at high cut-off voltage

doi:10.1016/j.cjche.2014.03.001

Abstract

Abstract: The LiNi_1/3Co_1/3Mn_1/3O₂ is first obtained by the controlled crystallization method and then coatedwith Ni₃(PO₄)₂ particles. The effects of the coating on rate capability and cycle life at high cut-off voltage are investigated by electrochemical impedance spectroscopy and galvanostatic measurements. The element ratio of Ni:Mn:Co is tested by inductively-coupled plasma spectrometer (ICP) analysis and it testified to be 1:1:1. It is indicated that Ni₃(PO₄)₂-coated LiNi_1/3Co_1/3Mn_1/3O₂ has an outstanding capacity retention, where 99% capacity retention is maintained after 10 cycles at 5C discharge rate between 2.7 V and 4.6 V. The electrochemical impedance spectroscopy (EIS) results show that the current exchange density i0 of the coated sample is higher than that of LiNi_1/3Co_1/3Mn_1/3O₂, which is beneficial to its electrochemical performances. All the conclusions show that the Ni₃(PO₄)₂ coating can prominently enhance the high rate performance of the LiNi_1/3Co_1/3Mn_1/3O₂, especially at high cut-off voltage.

Key words: LiNi_1/3Co_1/3Mn_1/3O₂ cathode material, Electrochemistry, Ni₃(PO₄)₂ coating, High tap density, High rate discharge capacity

摘要： The LiNi_1/3Co_1/3Mn_1/3O₂ is first obtained by the controlled crystallization method and then coatedwith Ni₃(PO₄)₂ particles. The effects of the coating on rate capability and cycle life at high cut-off voltage are investigated by electrochemical impedance spectroscopy and galvanostatic measurements. The element ratio of Ni:Mn:Co is tested by inductively-coupled plasma spectrometer (ICP) analysis and it testified to be 1:1:1. It is indicated that Ni₃(PO₄)₂-coated LiNi_1/3Co_1/3Mn_1/3O₂ has an outstanding capacity retention, where 99% capacity retention is maintained after 10 cycles at 5C discharge rate between 2.7 V and 4.6 V. The electrochemical impedance spectroscopy (EIS) results show that the current exchange density i0 of the coated sample is higher than that of LiNi_1/3Co_1/3Mn_1/3O₂, which is beneficial to its electrochemical performances. All the conclusions show that the Ni₃(PO₄)₂ coating can prominently enhance the high rate performance of the LiNi_1/3Co_1/3Mn_1/3O₂, especially at high cut-off voltage.

关键词: LiNi_1/3Co_1/3Mn_1/3O₂ cathode material, Electrochemistry, Ni₃(PO₄)₂ coating, High tap density, High rate discharge capacity

Yan Cui, Shengming Xu . High tap density of Ni₃(PO₄)₂ coated LiNi_1/3Co_1/3Mn_1/3O₂ with enhanced cycling performance at high cut-off voltage[J]. Chin.J.Chem.Eng., 2015, 23(1): 315-320.

Yan Cui, Shengming Xu . High tap density of Ni₃(PO₄)₂ coated LiNi_1/3Co_1/3Mn_1/3O₂ with enhanced cycling performance at high cut-off voltage[J]. Chinese Journal of Chemical Engineering, 2015, 23(1): 315-320.

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High tap density of Ni₃(PO₄)₂ coated LiNi_1/3Co_1/3Mn_1/3O₂ with enhanced cycling performance at high cut-off voltage

High tap density of Ni₃(PO₄)₂ coated LiNi_1/3Co_1/3Mn_1/3O₂ with enhanced cycling performance at high cut-off voltage

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