sp2/sp3 Hybridized Carbon as
an Anode with Extra Li-Ion Storage Capacity: Construction and Origin
Posted on 2020-07-21 - 20:14
Doping in carbon anodes can introduce
active sites, usually leading
to extra capacity in Li-ion batteries (LIBs), but the underlying reasons
have not been uncovered deeply. Herein, the dodecahedral carbon framework
(N-DF) with a low nitrogen content (3.06 wt %) is fabricated as the
anode material for LIBs, which shows an extra value of 298 mA h g–1 during 250 cycles at 0.1 A g–1.
Various characterizations and theoretical calculations demonstrate
that the essence of the extra capacity mainly stems from non-coplanar
sp2/sp3 hybridized orbital controlling non-Euclidean
geometrical structure, which acts as new Li-ion active sites toward
the excess Li+ adsorption. The electrochemical kinetics
and in situ transmission electron microscope further
reveal that the positive and negative curvature architectures not
only provide supernumerary Li+ storage sites on the surface
but also hold an enhanced (002) spacing for fast Li+ transport.
The sp2/sp3 hybridized orbital design concept
will help to develop advanced electrode materials.
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Lu, Zongjing; Gao, Denglei; Yi, Ding; Yang, Yijun; Wang, Xi; Yao, Jiannian (2020). sp2/sp3 Hybridized Carbon as
an Anode with Extra Li-Ion Storage Capacity: Construction and Origin. ACS Publications. Collection. https://doi.org/10.1021/acscentsci.0c00593
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AUTHORS (6)
ZL
Zongjing Lu
DG
Denglei Gao
DY
Ding Yi
YY
Yijun Yang
XW
Xi Wang
JY
Jiannian Yao