期刊
NANO RESEARCH
卷 13, 期 11, 页码 3137-3141出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-2984-5
关键词
K metal anode; dendrite; oxygen-rich treated carbon cloth; K-philic sites; ultra-long-life
类别
资金
- Innovation Program of Central South University [2019zzts249]
The K metal batteries are emerged as promising alternatives beyond commercialized Li-ion batteries. However, suppressing uncontrolled dendrite is crucial to the accomplishment of K metal batteries. Herein, an oxygen-rich treated carbon cloth (TCC) has been designed as the K plating host to guide K homogeneous nucleation and suppress the dendrite growth. Both density function theory calculations and experimental results demonstrate that abundant oxygen functional groups as K-philic sites on TCC can guide K nucleation and deposition homogeneously. As a result, the TCC electrode exhibits an ultra-long-life over 800 cycles at high current density of 3.0 mA.cm(-2) for 3.0 mA.h.cm(-2). Furthermore, the symmetrical cells can run stably for 2,000 h with low over-potential less than 20 mV at 1.0 mA.cm(-2) for 1.0 mA.h.cm(-2). Even at a higher current of 5.0 mA.cm(-2), the TCC electrode can still stably cycle for 1,400 h.
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