期刊
ISCIENCE
卷 24, 期 12, 页码 -出版社
CELL PRESS
DOI: 10.1016/j.isci.2021.103494
关键词
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资金
- China Postdoctoral Science Foundation [2021TQ0266]
- Fundamental Research Funds for the Central Universities [G2020KY0534]
The study demonstrates the construction of Sb2S3@rGO@NC as an anode for PIBs, achieving high initial charge capacity and long cycle life. In situ characterizations confirm the electrode undergoes a multi-electron transfer process and the dual mechanisms of K-ion insertion/extraction.
The large volume expansion and sluggish dynamic behavior are the key bottleneck to suppress the development of conversion-alloying dual mechanism anode for potassium-ion batteries (PIBs). Herein, Sb2S3 nanorods encapsulated by reduced graphene oxide and nitrogen-doped carbon (Sb2S3@rGO@NC) are constructed as anodes for PIBs. The synergistic effect of dual physical protection and robust C-Sb chemical bonding boosts superior electrochemical kinetics and great electrode stability. Thus, Sb2S3@rGO@NC exhibits a high initial charge capacity of 505.6 mAh.g(-1) at 50 mA.g(-1) and a great cycle stability with the lifetime over 200 cycles at 200 mA.g(-1). Ex situ XRD, XPS, and TEM characterizations confirm that the electrode undergoes a multielectron transfer process (Sb2S3 <-> Sb + K2S <-> KSb + K3Sb), where K-ion insert into/extract from the material via dual mechanisms of conversion and alloying. This work sheds a light on the construction of high-performance anode materials and the understanding of K-ion storage mechanism.
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