TY - JOUR
T1 - Large-scale production of spherical FeSe2-amorphous carbon composite powders as anode materials for sodium-ion batteries
AU - Park, Gi Dae
AU - Kim, Jung Hyun
AU - Kang, Yun Chan
N1 - Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) ( NRF-2015R1A2A1A15056049 ). This work was supported by the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea ( 201320200000420 and 20153030091450 ).
Publisher Copyright:
© 2016 Elsevier Inc.
PY - 2016/10/1
Y1 - 2016/10/1
N2 - A simple two-step method involving a large-scale spray drying process is developed to synthesize metal selenide-amorphous carbon (AC) composite powders (on a kilogram scale) for use as anodes in sodium-ion batteries. The composite powders of iron salt, dextrin, and H2SeO3 are generated in a spray drying process to form the FeSe2-AC composite powders by a one-pot post-treatment process under a reducing atmosphere. The ultrafine FeSe2 single crystals with sizes below 20 nm are uniformly dispersed within the amorphous carbon in the FeSe2-AC composite powders prepared from the spray solution with 30 g L− 1 dextrin. The discharge capacities of the powders prepared from spray solutions with 0, 10, 20, and 30 g L− 1 dextrin for the 150th cycle at a current density of 0.5 A g− 1 are 85, 194, 203, 379 mA h g− 1, respectively; their corresponding capacity retentions measured from the second cycle are 19%, 40%, 46%, and 99%. The spherical shape of the FeSe2-AC composite powders is maintained even after 100 cycles. The FeSe2-AC composite powders maintain a high structural stability during repeated sodium insertion and desertion processes, and show superior cycling and rate performances compared to those of the bare FeSe2 powders.
AB - A simple two-step method involving a large-scale spray drying process is developed to synthesize metal selenide-amorphous carbon (AC) composite powders (on a kilogram scale) for use as anodes in sodium-ion batteries. The composite powders of iron salt, dextrin, and H2SeO3 are generated in a spray drying process to form the FeSe2-AC composite powders by a one-pot post-treatment process under a reducing atmosphere. The ultrafine FeSe2 single crystals with sizes below 20 nm are uniformly dispersed within the amorphous carbon in the FeSe2-AC composite powders prepared from the spray solution with 30 g L− 1 dextrin. The discharge capacities of the powders prepared from spray solutions with 0, 10, 20, and 30 g L− 1 dextrin for the 150th cycle at a current density of 0.5 A g− 1 are 85, 194, 203, 379 mA h g− 1, respectively; their corresponding capacity retentions measured from the second cycle are 19%, 40%, 46%, and 99%. The spherical shape of the FeSe2-AC composite powders is maintained even after 100 cycles. The FeSe2-AC composite powders maintain a high structural stability during repeated sodium insertion and desertion processes, and show superior cycling and rate performances compared to those of the bare FeSe2 powders.
KW - Carbon composite
KW - Metal selenide
KW - Nanostructure
KW - Sodium ion batteries
KW - Spray drying
UR - http://www.scopus.com/inward/record.url?scp=84987935036&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2016.09.019
DO - 10.1016/j.matchar.2016.09.019
M3 - Article
AN - SCOPUS:84987935036
SN - 1044-5803
VL - 120
SP - 349
EP - 356
JO - Materials Characterization
JF - Materials Characterization
ER -