TY - JOUR
T1 - Mesoporous CoSe2 nanoclusters threaded with nitrogen-doped carbon nanotubes for high-performance sodium-ion battery anodes
AU - Yang, Su Hyun
AU - Park, Seung Keun
AU - Kang, Yun Chan
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government ( MSIP ) (No. 2017R1A2B2008592 and 2017R1D1A1B03034473 ).
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/8/15
Y1 - 2019/8/15
N2 - Currently, a great challenge to the design of durable sodium-ion batteries (SIBs) is the need for the architecture of nanostructured transition metal-selenide electrodes with high capacity and excellent cycling stability. In this paper, we describe a novel metal-organic framework (MOF)-induced approach to construct necklace-like carbon nanotube (CNT)– CoSe2@N-doped carbon (NC) with excellent sodium ion storage performance. In this strategy, CNT-threaded zeolitic imidazolate framework-67 (ZIF-67) polyhedra, synthesized by wet chemical methods, are used as the precursor. During the selenization step, ZIF-67 polyhedra transform into mesoporous nanoclusters consisted of CoSe2@NC nanoparticles, forming CNT-CoSe2@NC composites with a necklace-like morphology. Such structures facilitate ion and electron transport, and inhibit the aggregation and pulverization of active materials during cycling processes via the intimate contact between the CNTs and CoSe2@NC. The as-designed composites show significantly improved electrochemical properties including high discharge capacity (404 mA·h·g−1 after 120 cycles at 0.2 A·g−1), excellent rate performance (363 mA·h·g−1 at 5.0 A·g−1), and reasonable capacity retention (80% when calculated from the 2nd cycle).
AB - Currently, a great challenge to the design of durable sodium-ion batteries (SIBs) is the need for the architecture of nanostructured transition metal-selenide electrodes with high capacity and excellent cycling stability. In this paper, we describe a novel metal-organic framework (MOF)-induced approach to construct necklace-like carbon nanotube (CNT)– CoSe2@N-doped carbon (NC) with excellent sodium ion storage performance. In this strategy, CNT-threaded zeolitic imidazolate framework-67 (ZIF-67) polyhedra, synthesized by wet chemical methods, are used as the precursor. During the selenization step, ZIF-67 polyhedra transform into mesoporous nanoclusters consisted of CoSe2@NC nanoparticles, forming CNT-CoSe2@NC composites with a necklace-like morphology. Such structures facilitate ion and electron transport, and inhibit the aggregation and pulverization of active materials during cycling processes via the intimate contact between the CNTs and CoSe2@NC. The as-designed composites show significantly improved electrochemical properties including high discharge capacity (404 mA·h·g−1 after 120 cycles at 0.2 A·g−1), excellent rate performance (363 mA·h·g−1 at 5.0 A·g−1), and reasonable capacity retention (80% when calculated from the 2nd cycle).
KW - CNT (carbon nanotube)
KW - Cobalt selenide
KW - Mesoporous
KW - Necklace-like structure
KW - Sodium-ion battery
UR - http://www.scopus.com/inward/record.url?scp=85063722932&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2019.03.263
DO - 10.1016/j.cej.2019.03.263
M3 - Article
AN - SCOPUS:85063722932
VL - 370
SP - 1008
EP - 1018
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -