Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 45, Pages 42078-42085Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b13118
Keywords
potassium-ion battery; full battery; polyimide cathode; electrolyte; storage mechanism
Funding
- National Natural Science Foundation of China [51672078, 21473052, 61474041]
- Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Independent Research Project [71675004]
- Hunan Youth Talents [2016RS3025]
- Foundation of State Key Laboratory of Coal Conversion [J17-18-903]
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Potassium has similar chemical characteristics compared with lithium while it is more abundant and of low cost, resulting in widespread research attention on potassium-ion batteries (PIBs). Developing organic polymer cathodes has garnered extensive attention because of their merits of environmental friendship and structure diversity, while confronted with inferior cycle stability and low rate performance. In this paper, we utilize the low-cost graphite nanosheets to stabilize polyimide (PI@G) for PIBs. Additionally, the potassium storage mechanism of PI@G was further evaluated; the highly reversible chemical bonds (C=O) of PI@G are responsible to its long-term stability. Consequently, the PI@G exhibits a maximal capacity of 142 mA h g(-1) at the current density of 100 mA and maintains a capacity of 118 mA h g(-1) after 500 cycles (corresponding to a capacity fade of 0.034% per cycle). Moreover, the full battery based on the PI@G cathode also reveals promisingly electrochemical performance. This study may have great significance to the application prospect of the organic cathode for PIBs.
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