期刊
ELECTROCHIMICA ACTA
卷 187, 期 -, 页码 340-347出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.11.061
关键词
manganese oxide; PEDOT:PSS; capacity increasing; abnormal capacity; lithium ion battery
资金
- [IBS-R006-G1]
Transition metal oxides have been considered as promising lithium storage materials that undergo a conversion reaction, exhibiting high specific capacity. However, capacity fading during cycling is the most serious obstacle for their commercialization. In order to overcome this, we have added PEDOT: PSS (poly (3,4-ethylenedioxythiophene) polystyrene sulfonate) to Mn2O3 nanowires. PEDOT: PSS was successfully coated onto Mn2O3 nanowires while maintaining the structure of Mn2O3. The coating of PEDOT: PSS reduced the resistance of the surface and protected the surface electron channels from the pulverization effect of the charge-discharge operation. alpha-Mn2O3/PEDOT: PSS showed excellent cyclability with a reversible capacity of 1450 mAh g (1) after 200 cycles at a current density of 100 mA g (1). An increase in capacity was observed with continuous cycling, which may be attributed to further oxidation of the manganese species and a reversible reaction of the gel-like polymer on the manganese surface. The results demonstrate that PEDOT: PSS enhances the electrochemical activity by providing electron channels and prevents pulverization caused by the charge and discharge process. (C) 2015 Elsevier Ltd. All rights reserved.
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