TY - JOUR
T1 - Bismuth Telluride Nanoplates Hierarchically Confined by Graphene and N-Doped C as Conversion-Alloying Anode Materials for Potassium-Ion Batteries
AU - Chong, Shaokun
AU - Yuan, Lingling
AU - Zhou, Qianwen
AU - Wang, Yikun
AU - Qiao, Shuangyan
AU - Li, Ting
AU - Ma, Meng
AU - Yuan, Bingyang
AU - Liu, Zhengqing
N1 - Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023/11/15
Y1 - 2023/11/15
N2 - Potassium-ion batteries (PIBs) have broad application prospects in the field of electric energy storage systems because of its abundant K reserves, and similar “rocking chair” operating principle as lithium-ion batteries (LIBs). Aiming to the large volume expansion and sluggish dynamic behavior of anode materials for storing large sized K-ion, bismuth telluride (Bi2Te3) nanoplates hierarchically encapsulated by reduced graphene oxide (rGO), and nitrogen-doped carbon (NC) are constructed as anodes for PIBs. The resultant Bi2Te3@rGO@NC architecture features robust chemical bond of Bi─O─C, tightly physicochemical confinement effect, typical conductor property, and enhanced K-ion adsorption ability, thereby producing superior electrochemical kinetics and outstanding morphological and structural stability. It is visually elucidated via high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) that conversion-alloying dual-mechanism plays a significant role in K-ion storage, allowing 12 K-ion transport per formular unit employing Bi as redox site. Thus, the high first reversible specific capacity of 322.70 mAh g−1 at 50 mA g−1, great rate capability and cyclic stability can be achieved for Bi2Te3@rGO@NC. This work lays the foundation for an in-depth understanding of conversion-alloying mechanism in potassium-ion storage.
AB - Potassium-ion batteries (PIBs) have broad application prospects in the field of electric energy storage systems because of its abundant K reserves, and similar “rocking chair” operating principle as lithium-ion batteries (LIBs). Aiming to the large volume expansion and sluggish dynamic behavior of anode materials for storing large sized K-ion, bismuth telluride (Bi2Te3) nanoplates hierarchically encapsulated by reduced graphene oxide (rGO), and nitrogen-doped carbon (NC) are constructed as anodes for PIBs. The resultant Bi2Te3@rGO@NC architecture features robust chemical bond of Bi─O─C, tightly physicochemical confinement effect, typical conductor property, and enhanced K-ion adsorption ability, thereby producing superior electrochemical kinetics and outstanding morphological and structural stability. It is visually elucidated via high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) that conversion-alloying dual-mechanism plays a significant role in K-ion storage, allowing 12 K-ion transport per formular unit employing Bi as redox site. Thus, the high first reversible specific capacity of 322.70 mAh g−1 at 50 mA g−1, great rate capability and cyclic stability can be achieved for Bi2Te3@rGO@NC. This work lays the foundation for an in-depth understanding of conversion-alloying mechanism in potassium-ion storage.
KW - anode materials
KW - bismuth telluride
KW - conversion-alloying mechanism
KW - potassium-ion batteries
UR - http://www.scopus.com/inward/record.url?scp=85164786316&partnerID=8YFLogxK
U2 - 10.1002/smll.202303985
DO - 10.1002/smll.202303985
M3 - 文章
C2 - 37442792
AN - SCOPUS:85164786316
SN - 1613-6810
VL - 19
JO - Small
JF - Small
IS - 46
M1 - 2303985
ER -