期刊
FUNDAMENTAL RESEARCH
卷 3, 期 5, 页码 813-821出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.fmre.2022.03.018
关键词
Bionic structures; K metal anodes; Internal electric field; Dendrite inhibition; 3D scaffolds
By using bionic virus-like-carbon microspheres as the anode host for potassium metal batteries, dendrite formation can be suppressed and volume change can be accommodated, resulting in stable cycle life and performance.
Stable potassium metal batteries (PMBs) are promising candidates for electrical energy storage due to their ability to reversibly store electrical energy at a low cost. However, dendritic growth and large volume changes hinder their practical application. Here, referring to the morphology and structure of a virus, a bionic virus-like-carbon microsphere (BVC) was designed as the anode host for a PMB. A BVC with a three-dimensional structure can not only control the electric field, which can suppress dendrite formation, but can also provide a larger space to accommodate the volume change during the cycle progress. The designed potassium (K) metal anode exhibits excellent cycle life and stability (during 1800 h of repeated plating/stripping of K at a current density of 0.1 mA cm -2, K-BVC can realize a very stable K metal anode with low voltage hysteresis). Stable cyclability and improved rate capability can be realized in a full cell using Prussian blue over 400 cycles. This research provides a new idea for the development of stable K metal anodes and may pave the way for the practical application of next-generation metal batteries.
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