Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Modulating the defects of graphene blocks by ball-milling for ultrahigh gravimetric and volumetric performance and fast sodium storage. / Dong, Yue; Lin, Xieji; Wang, Dengke и др.
в: Energy Storage Materials, Том 30, 01.09.2020, стр. 287-295.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Modulating the defects of graphene blocks by ball-milling for ultrahigh gravimetric and volumetric performance and fast sodium storage
AU - Dong, Yue
AU - Lin, Xieji
AU - Wang, Dengke
AU - Yuan, Renlu
AU - Zhang, Su
AU - Chen, Xiaohong
AU - Bulusheva, Lyubov G.
AU - Okotrub, Alexander V.
AU - Song, Huaihe
PY - 2020/9/1
Y1 - 2020/9/1
N2 - Dense carbon materials with fast sodium storage performance are strongly desired for developing high-energy and high-power devices, but remain challenging because of the sluggish Na+ transport kinetics. Herein, we report that the defect density and sp2 cluster size of dense graphene blocks (DGB) can be elaborately modulated by ball-milling to achieve both high gravimetric and volumetric capacities and outstanding rate performance for Na+ storage. The loose graphene flakes are cut into small platelets with enriched defects and simultaneously densified by mechanical forces, leading to abundant active sites for Na+ storage, controlled sp2 size as conductive networks, and large interlayer spacing for fast Na+ transport. The DGB performs a novel capacitive Na+ storage with high capacities of 507 mAh g−1 and 397 mAh cm−3 at 50 mA g−1, and an ultrahigh rate of 181 mAh g−1 at 10 A g−1. It also shows a remarkable cycle stability due to the strongly-coupled layer structure. The comprehensive performance is superior to most of the reported carbons. The Na-ion capacitor delivers an ultrahigh energy density of 45 Wh kg−1 even at 14,205 W kg−1. Our work broadens the avenue for preparing advanced carbon materials for compact Na+ storage.
AB - Dense carbon materials with fast sodium storage performance are strongly desired for developing high-energy and high-power devices, but remain challenging because of the sluggish Na+ transport kinetics. Herein, we report that the defect density and sp2 cluster size of dense graphene blocks (DGB) can be elaborately modulated by ball-milling to achieve both high gravimetric and volumetric capacities and outstanding rate performance for Na+ storage. The loose graphene flakes are cut into small platelets with enriched defects and simultaneously densified by mechanical forces, leading to abundant active sites for Na+ storage, controlled sp2 size as conductive networks, and large interlayer spacing for fast Na+ transport. The DGB performs a novel capacitive Na+ storage with high capacities of 507 mAh g−1 and 397 mAh cm−3 at 50 mA g−1, and an ultrahigh rate of 181 mAh g−1 at 10 A g−1. It also shows a remarkable cycle stability due to the strongly-coupled layer structure. The comprehensive performance is superior to most of the reported carbons. The Na-ion capacitor delivers an ultrahigh energy density of 45 Wh kg−1 even at 14,205 W kg−1. Our work broadens the avenue for preparing advanced carbon materials for compact Na+ storage.
KW - Capacitive sodium storage
KW - Dense graphene blocks
KW - Interlayer spacing
KW - Sodium-ion capacitor
KW - sp cluster size
KW - ION BATTERIES
KW - sp(2) cluster size
KW - ANODE MATERIAL
KW - CYCLE LIFE
KW - CARBON NANOSHEETS
KW - GRAPHITE
KW - INTERCALATION
KW - NA
KW - RATE CAPABILITY
KW - ELECTROCHEMICAL ENERGY-STORAGE
KW - LITHIUM
UR - http://www.scopus.com/inward/record.url?scp=85085729114&partnerID=8YFLogxK
U2 - 10.1016/j.ensm.2020.05.016
DO - 10.1016/j.ensm.2020.05.016
M3 - Article
AN - SCOPUS:85085729114
VL - 30
SP - 287
EP - 295
JO - Energy Storage Materials
JF - Energy Storage Materials
SN - 2405-8297
ER -
ID: 24410927