Effects of complexants on [Ni_1/3Co_1/3Mn_1/3]CO₃ morphology and electrochemical performance of LiNi_1/3Co_1/3Mn_1/3O₂

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• 作者：Shunyi Yang (1)
  Xianyou Wang (1) wxianyou@yahoo.com
  Quanqi Chen (1)
  Xiukang Yang (1)
  Jiaojiao Li (1)
  Qiliang Wei (1)
• 关键词：Lithium ion batteries – ; LiNi1/3Co1/3Mn1/3O2 – ; Carbonate co ; precipitation method – ; Complexant – ; Spherical particles
• 刊名：Journal of Solid State Electrochemistry
• 出版时间：February 2012
• 出版年：2012
• 期刊代码：79_1432-8488
• 类别：ch
• 卷：16
• 期：2
• 页码：481-490
• 数据来源：sp

摘要

LiNi_1/3Co_1/3Mn_1/3O₂ cathode materials for the application of lithium ion batteries were synthesized by carbonate co-precipitation routine using different ammonium salt as a complexant. The structures and morphologies of the precursor [Ni_1/3Co_1/3Mn_1/3]CO₃ and LiNi_1/3Co_1/3Mn_1/3O₂ were investigated through X-ray diffraction, scanning electron microscope, and transmission electron microscopy. The electrochemical properties of LiNi_1/3Co_1/3Mn_1/3O₂ were examined using charge/discharge cycling and cyclic voltammogram tests. The results revealed that the microscopic structures, particle size distribution, and the morphology properties of the precursor and electrochemical performance of LiNi_1/3Co_1/3Mn_1/3O₂ were primarily dependent on the complexant. Among all as-prepared LiNi_1/3Co_1/3Mn_1/3O₂ cathode materials, the sample prepared from Na₂CO₃–NH₄HCO₃ routine using NH₄HCO₃ as the complexant showed the smallest irreversible capacity of 19.5 mAh g−1 and highest discharge capacity of 178.4 mAh g−1 at the first cycle as well as stable cycling performance (98.7%of the initial capacity was retained after 50 cycles) at 0.1 C (20 mA g−1) in the voltage range of 2.5–4.4 V vs. Li+/Li. Moreover, it delivered high discharge capacity of over 135 mAh g−1 at 5 C (1,000 mA g−1).