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Materials 2016, 9(8), 661; doi:10.3390/ma9080661

Nano-Crystalline Li1.2Mn0.6Ni0.2O2 Prepared via Amorphous Complex Precursor and Its Electrochemical Performances as Cathode Material for Lithium-Ion Batteries

1
Institute of Nuclear & New Energy Technology, Tsinghua University, Beijing 100084, China
2
State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
3
State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Academic Editor: Martin Wilkening
Received: 17 May 2016 / Revised: 22 July 2016 / Accepted: 1 August 2016 / Published: 5 August 2016
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Abstract

An amorphous complex precursor with uniform Mn/Ni cation distribution is attempted for preparing a nano-structured layered Li-rich oxide (Li1.2Mn0.6Ni0.2O2)cathode material, using diethylenetriaminepentaacetic acid (DTPA) as a chelating agent. The materials are characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical tests. The crystal structure of Li-rich materials is found to be closely related to synthesis temperature. As-obtained nano materials sintered at 850 °C for 10 h show an average size of 200 nm with a single crystal phase and good crystallinity. At a current density of 20 mA·g−1, the specific discharge capacity reaches 221 mAh·g−1 for the first cycle and the capacity retention is 81% over 50 cycles. Even at a current density of 1000 mA·g−1, the capacity is as high as 118 mAh·g−1. The enhanced rate capability can be ascribed to the nano-sized morphology and good crystal structure. View Full-Text
Keywords: amorphous complex; nanoparticles; rate capability; Li-rich oxide; Lithium ion batteries amorphous complex; nanoparticles; rate capability; Li-rich oxide; Lithium ion batteries
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He, X.; Wang, J.; Wang, L.; Li, J. Nano-Crystalline Li1.2Mn0.6Ni0.2O2 Prepared via Amorphous Complex Precursor and Its Electrochemical Performances as Cathode Material for Lithium-Ion Batteries. Materials 2016, 9, 661.

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