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, SbS nanorods encapsulated by reduced graphene oxide and nitrogen-doped carbon (SbS@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, SbS@rGO@NC exhibits a high initial charge capacity of 505.6 mAh·g at 50 mA·g and a great cycle stability with the lifetime over 200 cycles at 200 mA·g. XRD, XPS, and TEM characterizations confirm that the electrode undergoes a multielectron transfer process (SbS↔ Sb + KS ↔ KSb + KSb), 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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| http://dx.doi.org/10.1016/j.isci.2021.103494 | DOI Listing |
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