Insights into the Potassium Ion Storage Behavior and Phase Evolution of a Tailored Yolk–Shell SnSe@C Anode

Autor: Qing Sun, Maoxiang Yang, Guifang Zeng, Jing Li, Zhibiao Hu, Deping Li, Shang Wang, Pengchao Si, Yanhong Tian, Lijie Ci
Rok vydání: 2022
Předmět:
Zdroj: Small. 18:2203459
ISSN: 1613-6829
1613-6810
Popis: Tin chalcogenides are regarded as promising anode materials for potassium ion batteries (PIBs) due to their considerable specific capacity. However, the severe volume effect, limited electronic conductivity, and the shuttle effect of the potassiation product restrict the application prospect. Herein, based on the metal evaporation reaction, a facile structural engineering strategy for yolk-shell SnSe encapsulated in carbon shell (SnSe@C) is proposed. The internal void can accommodate the volume change of the SnSe core and the carbon shell can enhance the electronic conductivity. Combining qualitative and quantitative electrochemical analyses, the distinguished electrochemical performance of SnSe@C anode is attributed to the contribution of enhanced capacitive behavior. Additionally, first-principles calculations elucidate that the heteroatomic doped carbon exhibits a preferable affinity toward potassium ions and the potassiation product K
Databáze: OpenAIRE
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