Jiangsu Cobalt Nickel Metal KLK Co.

Taixing, China

Jiangsu Cobalt Nickel Metal KLK Co.

Taixing, China
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Wang C.,Nanjing University of Aeronautics and Astronautics | Zhou F.,Nanjing University of Aeronautics and Astronautics | Ren C.,Nanjing University of Aeronautics and Astronautics | Wang Y.,Nanjing University of Technology | And 4 more authors.
Solid State Ionics | Year: 2015

The 0.6Li2MnO3·0.4Li [Ni0.5Co0.2Mn0.3]O2 (Li1.2[Mn0.52Ni0.2Co0.08]O2) nanoparticles have been synthesized using a co-precipitation method. The conventional chelating agent NH3·H2O was replaced by environmentally friendly sodium lactate, and then the influences of carbonate co-precipitation temperature and stirring time on the microstructure and electrochemical properties of Li1.2[Mn0.52Ni0.2Co0.08]O2-positive electrode are discussed systematically. The crystal structure, particle morphology and electrochemical properties of the as-prepared samples are studied by XRD, SEM and charge-discharge tests. The optimal material (Li1.2[Mn0.52Ni0.2Co0.08]O2-60 °C/16 h) had a spherical particle shape and a well-ordered layered structure, as well as high tap-density and a low cation-mixing degree. In addition, the sample delivers the best electrochemical properties with a capacity retention of 96.58% (189.1 mAh g- 1) after 100 cycles at 0.5C rate and the highest discharge capacity of 175.2 mAh g- 1 at 1C rate. © 2015 Elsevier B.V. All rights reserved.


Wang C.,Nanjing University of Aeronautics and Astronautics | Zhou F.,Nanjing University of Aeronautics and Astronautics | Chen K.,Jiangsu University | Kong J.,Nanjing University of Aeronautics and Astronautics | And 5 more authors.
Electrochimica Acta | Year: 2015

Abstract MoO3-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode materials were synthesized via using co-precipitation method and wet coating process, and their crystal structure and particle morphology were analyzed and observed by XRD, SEM and TEM. The electrochemical properties of these materials were investigated and analyzed by using charge-discharge tests and electrochemical impedance spectroscopy. The results showed that the surface coating on Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode was composed of α-MoO3 and Li2MoO4, and the electrochemical properties were improved after coated with MoO3 thin films. The initial coulombic efficiencies increased from 71.2% to 79.3% when the MoO3 content increased to 5 wt.%. Particularly, the 3 wt.% MoO3-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 showed the highest capacity retention of 90.8% after 100 cycles, and possessed the excellent rate discharge performance. The electrochemical impedance spectroscopy (EIS) and cyclic voltammetric results demonstrated that the layered MoO3 coating could restrain the increment of the charge transfer resistance and stabilize the active material structure during cyclic process. © 2015 Elsevier Ltd.


Wang C.,Nanjing University of Aeronautics and Astronautics | Zhou F.,Nanjing University of Aeronautics and Astronautics | Ren C.,Nanjing University of Aeronautics and Astronautics | Kong J.,Nanjing University of Aeronautics and Astronautics | And 4 more authors.
Journal of Alloys and Compounds | Year: 2015

Abstract MCO3 precursors are synthesized via co-precipitation method using NaCO3 as the precipitation, and the environment friendly C3H5NaO3 is acted as complexing agent to replace NH3×H2O. And then the mixtures of MCO3 precursors and LiOH×H2O are calcined at 950°C to form Li1.2[Mn0.52-0.5xNi0.2-0.5xCo0.08+x]O2 cathode materials with different Co increments. The influence of Co increment on the microstructure and electrochemical properties of Li1.2[Mn0.52-0.5xNi0.2-0.5xCo0.08+x]O2 cathode materials has been analyzed. The results show that the c/a ratio for cathode material becomes higher, and then the layered structure becomes better when the Co increment increases. Among them, Li1.2[Mn0.51Ni0.19Co0.1]O2 (x = 0.02) shows the best electrochemical properties with the initial discharge capacity of 261.0 mA h g-1, capacity retention of 99.4% (189.9 mA h g-1) after 100 cycles at the charging and discharging current density of 100 mA g-1 and highest discharge capacity of 157.6 mA h g-1 at the discharging current density of 400 mA g-1. © 2015 Elsevier B.V. All rights reserved.

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