期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 23, 页码 7127-7134出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b02178
关键词
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资金
- National Natural Science Foundation of China [51672282]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09010101]
K-ion batteries (KIBs) are now drawing increasing research interest as an inexpensive alternative to Li-ion batteries (LIBs). However, due to the large size of K+, stable electrode materials capable of sustaining the repeated K+ intercalation/deintercalation cycles are extremely deficient especially if a satisfactory reversible capacity is expected. Herein, we demonstrated that the structural engineering of carbon into a hollow interconnected architecture, a shape similar to the neuron-cell network, promised high conceptual and technological potential for a high-performance KIB anode. Using melamine-formaldehyde resin as the starting material, we identify an interesting glass blowing effect of this polymeric precursor during its carbonization, which features a skeleton-softening process followed by its spontaneous hollowing. When used as a KIB anode, the carbon scaffold with interconnected hollow channels can ensure a resilient structure for a stable potassiation/depotassiation process and deliver an extraordinary capacity (340 mAh g(-1) at 0.1 C) together with a superior cycling stability (no obvious fading over 150 cycles at 0.5 C).
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