A
Covalent Organic Framework with Extended π‑Conjugated
Building Units as a Highly Efficient Recipient for Lithium–Sulfur
Batteries
Posted on 2020-07-27 - 16:13
Lithium–sulfur
(Li–S) batteries have recently become
a research hotspot because of their tempting theoretical capacity
and energy density. Nevertheless, the notorious shuttle of polysulfides
hinders the advancement of Li–S batteries. Herein, a two-dimensional
covalent organic framework (COF) with extended π-conjugated
units has been designed, synthesized, and used as sulfur recipients
with 88.4 wt % in loading. The COF offers an elaborate platform for
sufficient Li–S redox reactions with almost theoretical capacity
release (1617 mA h g–1 at 0.1 C), satisfactory rate
capability, and intensively traps polysulfides for a decent Coulombic
efficiency (ca. 98.0%) and extremely low capacity decay (0.077% per
cycle after 528 cycles at 0.5 C). The structural factors of the COF
on the high-performance batteries are revealed by density functional
theory calculations to be the high degrees of conjugation and proper
interlayer space. This work not only demonstrates the great potential
of COFs as highly efficient sulfur recipients but also provides a
viable guidance for further design of COF materials to tackle shuttling
issues toward active materials in electrochemical energy storage.
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Lu, Bing-Yi; Wang, Zhi-Qing; Cui, Fu-Zhi; Li, Jiang-Yu; Han, Xiang-Hao; Qi, Qiao-Yan; et al. (2020). A
Covalent Organic Framework with Extended π‑Conjugated
Building Units as a Highly Efficient Recipient for Lithium–Sulfur
Batteries. ACS Publications. Collection. https://doi.org/10.1021/acsami.0c08984
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AUTHORS (10)
BL
Bing-Yi Lu
ZW
Zhi-Qing Wang
FC
Fu-Zhi Cui
JL
Jiang-Yu Li
XH
Xiang-Hao Han
QQ
Qiao-Yan Qi
DM
De-Li Ma
GJ
Guo-Fang Jiang
XZ
Xian-Xiang Zeng
XZ
Xin Zhao