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Citation: ZHANG Xiao-Yu, JIANG Wei-Jun, ZHU Xiao-Pei, QI Lu. Characterization of LiNi_1/3Mn_1/3Co_1/3O₂ Synthesized by Wet-Chemical Method[J]. Acta Physico-Chimica Sinica, ;2010, 26(06): 1507-1514. doi: 10.3866/PKU.WHXB20100638 shu

Characterization of LiNi_1/3Mn_1/3Co_1/3O₂ Synthesized by Wet-Chemical Method

1.
Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China; CITIC Guoan Mengguli Power Source Technology Co., Ltd., Beijing 102200, P. R. China

Received Date: 9 February 2010
Available Online: 10 May 2010

A series of cathode materials LiNi1/3Mn1/3Co1/3O2 for lithium-ion batteries were successfully synthesized using succinic acid as a chelating agent by a wet-chemical method. We varied the succinic acid to metal-ion molar ratios (R) and investigated the effect of this parameter on the physical and electrochemical properties of the prepared LiNi1/3Mn1/3Co1/3O2. The reaction mechanism, structural, morphological, and magnetic properties of the powders were characterized in detail by thermogravimetry (TG), X-ray diffraction (XRD), Rietveld refinement, scanning electron microscopy (SEM), and superconducting quantuminterface device (SQUID).We determine that the optimumconditions for the synthesis of LiNi1/3Mn1/3Co1/3O2 assisted with succinic acid is R=1, at the lowest amount of cation mixing. In addition, measurement of the magnetic properties revealed a concentration of Ni on the 3b Wyckoff site of the lithium-ions in od agreement with the results from the Rietveld refinement on the XRD spectra. For LiNi1/3Mn1/3Co1/3O2 (R=1), the Rietveld refinement showed that cation mixing in this sample was 1.85%, which is in quantitative agreement with that fromthe SQUIDresult (1.80%). It delivered an initial discharge capacity of 161 mAh·g-1 at a current rate of 0.2C (1C=160 mA·g-1) and at a cut-off voltage of 3.0-4.3 V with a coulombic efficiency of 93.1% and its capacity retention was 91.3% after 50 cycles.
- Lithium-ion battery,
- LiNi1/3Mn1/3Co1/3O2,
- Wet-chemical method,
- Cation mixing,
- Magnetic property
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沈阳化工大学材料科学与工程学院沈阳 110142

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Characterization of LiNi1/3Mn1/3Co1/3O2 Synthesized by Wet-Chemical Method

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Characterization of LiNi_1/3Mn_1/3Co_1/3O₂ Synthesized by Wet-Chemical Method