期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 565, 期 -, 页码 218-226出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.01.023
关键词
Sodium ion battery; Sodium manganate oxide; Porous microcube; Polypyrrole; Electrochemical performance
资金
- Program for Innovative Research Team in University of Ministry of Education of China [IRT13037]
Highly conductive cathode material with enhanced Na+ diffusion kinetics is of great importance in the exploration of sodium ion batteries. In this work, Na0.91MnO2 porous microcube which is coated with highly conductive polypyrrole (PPy) is obtained. The high Na content in the layered sodium manganate oxide brings about wider interlayer distance resulting in high capacity and electrochemical kinetics. The higher sodium content of Na0.91MO2 makes capacity increase up to 50 mAh g(-1) compared with Na0.7MnO2.05. Furthermore, the well-designed combination between porous structure and conductive PPy coating exhibits fast ion/electron transfer inside the electrode and high cycling stability. The PPy coated Na0.91MnO2 delivers a high initial capacity of 208 mAh g(-1), encouraging capacity retention and rate capability. Based on the porous Na-0.(91) MnO2@PPy cathode, the sodium ion full cells with puffed millet porous carbon anode show remarkably stable cycling and high-rate performances. (C) 2020 Elsevier Inc. All rights reserved.
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