Journal
ELECTROCHIMICA ACTA
Volume 258, Issue -, Pages 1035-1043Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.11.155
Keywords
Sodium ion batteries; Cathode material; Na0.44MnO2; Oxalate precursor
Categories
Funding
- National Youth Fund [21506141, 21606158]
- China National Natural Science Foundation [21506141, 21606158]
- Natural Science Foundation of Shanxi Province [2016021040, 2015021131]
Ask authors/readers for more resources
Na0.44MnO2 has aroused global interest as a promising cathode material for sodium ion batteries due to its unique tunnel structure. Rod-like Na0.44MnO2 is synthesized here via a simple, fast and environment-friendly oxalate precursor-based process, and the electrochemical performances, as well as the structural evolution within the electrode redox process and the chemical mechanism for material synthesis, are systematically investigated. The Na0.44MnO2 material prepared at 900 degrees C for 3 h (denoted as NMO-9003) possesses the highest reversible capacity of 120 mAh g(-1) at 0.2 C and an optimal rate capacity of 106 mAh g-1 at 1 C, while its long-term capacity retention is 86% after 500 cycles at 20 C, indicating superior structural reversibility. In addition, the NMO-9003 sample shows the fastest cationic diffusion rate at approximately 1.2 x 10(-13) cm(2) s(-1). The density functional theory (DFT)-based calculation is adopted to explore the lattice variation of Na0.44MnO2 upon the electrode process, which confirms that the host structure bears a minor volume change approximately 7% from 2.0 to 3.8 V, well demonstrating the origin of excellent reversibility. (C) 2017 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available