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Materials
Volume 9
Issue 8
10.3390/ma9080661
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Article

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

by
Xiangming He
1,2,
Jixian Wang
1,
Li Wang
1,3,* and
Jianjun Li
1
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
Materials 2016, 9(8), 661; https://doi.org/10.3390/ma9080661
Received: 17 May 2016 / Revised: 22 July 2016 / Accepted: 1 August 2016 / Published: 5 August 2016
(This article belongs to the Special Issue Amorphous and Nanocrystalline Materials for Electrochemical Energy Storage)
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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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MDPI and ACS Style

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. https://doi.org/10.3390/ma9080661

AMA Style

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(8):661. https://doi.org/10.3390/ma9080661

Chicago/Turabian Style

He, Xiangming, Jixian Wang, Li Wang, and Jianjun Li. 2016. "Nano-Crystalline Li1.2Mn0.6Ni0.2O2 Prepared via Amorphous Complex Precursor and Its Electrochemical Performances as Cathode Material for Lithium-Ion Batteries" Materials 9, no. 8: 661. https://doi.org/10.3390/ma9080661

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