期刊
JOURNAL OF POWER SOURCES
卷 243, 期 -, 页码 78-87出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.05.155
关键词
Sodium substitution; Cycling stability; Lithium-rich manganese oxide; Phase transformation; Lithium-ion batteries
资金
- National Natural Science Foundation of China [21203145]
Monoclinic layered Li2MnO3 has been extensively investigated due to its large discharge capacity. However, the poor cycling stability hinders its application as a cathode material of lithium-ion batteries. Herein we present a new strategy of sodium substitution for partial lithium to significantly enhance the cycling stability of Li2MnO3 through a conventional solid state reaction. In the electrochemical window of 2.0-4.6 V vs. Li/Li+, Li1.90Na0.10MnO3 delivers an initial discharge capacity of 181 mAh g(-1) with an excellent capacity retention of 99.3% after 45 cycles at 1/10 C, and 161 mAh g(-1) with a capacity retention of 98.6% after 100 cycles at 1/2 C. Sodium substitution for partial lithium is promising to make Li2MnO3 be practically applied at a low current density. (C) 2013 Elsevier B.V. All rights reserved.
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