TY - JOUR
T1 - In situ transformation of LDH into hollow cobalt-embedded and N-doped carbonaceous microflowers as polysulfide mediator for lithium-sulfur batteries
AU - Chen, Shixia
AU - Han, Xinxin
AU - Luo, Junhui
AU - Liao, Jing
AU - Wang, Jun
AU - Deng, Qiang
AU - Zeng, Zheling
AU - Deng, Shuguang
N1 - Funding Information:
This research work was supported by the National Natural Science Foundation of China (Nos. 51672186 and 21908090 ). The authors would like to acknowledge the support from Nanchang University and Arizona State University. S.X Chen gratefully acknowledges support from the Chinese Scholarship Council ( CSC , No. 201806820004 ) to undertake this research. Appendix A
Funding Information:
This research work was supported by the National Natural Science Foundation of China (Nos. 51672186 and 21908090). The authors would like to acknowledge the support from Nanchang University and Arizona State University. S.X Chen gratefully acknowledges support from the Chinese Scholarship Council (CSC, No. 201806820004) to undertake this research.
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/4/1
Y1 - 2020/4/1
N2 - The shuttle effect of soluble lithium polysulfides (LiPSs), accompanying with sluggish redox kinetics has severely impeded the implementation of lithium-sulfur (Li-S) batteries. Herein, a novel hollow cobalt-embedded and nitrogen-doped carbonaceous microflower (H-Co-NCM) is fabricated via in situ transformation of metanilic anions intercalated Co-Al layered double hydroxides (CoAl LDHs). The as-obtained S@H-Co-NCM electrode exhibits superior electrocatalytic performances to boost the kinetics of LiPSs conversion and Li2S nucleation. Consequently, the assembled Li-S batteries with a high sulfur loading of 82% display a remarkable initial capacity of 1374 mAh g−1 at 0.1 C, excellent rate capability (611 mAh g−1 at 2 C), and superb cycle stability (cyclic decay rate of 0.069% over 500 cycles at 0.5 C). The integrated strategy of strong chemisorption and fast conversion of LiPSs provides deeper insights to suppress the shuttle effect.
AB - The shuttle effect of soluble lithium polysulfides (LiPSs), accompanying with sluggish redox kinetics has severely impeded the implementation of lithium-sulfur (Li-S) batteries. Herein, a novel hollow cobalt-embedded and nitrogen-doped carbonaceous microflower (H-Co-NCM) is fabricated via in situ transformation of metanilic anions intercalated Co-Al layered double hydroxides (CoAl LDHs). The as-obtained S@H-Co-NCM electrode exhibits superior electrocatalytic performances to boost the kinetics of LiPSs conversion and Li2S nucleation. Consequently, the assembled Li-S batteries with a high sulfur loading of 82% display a remarkable initial capacity of 1374 mAh g−1 at 0.1 C, excellent rate capability (611 mAh g−1 at 2 C), and superb cycle stability (cyclic decay rate of 0.069% over 500 cycles at 0.5 C). The integrated strategy of strong chemisorption and fast conversion of LiPSs provides deeper insights to suppress the shuttle effect.
KW - Hollow, sulfur host
KW - Layered double hydroxide (LDH)
KW - Lithium-sulfur batteries
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U2 - 10.1016/j.cej.2019.123457
DO - 10.1016/j.cej.2019.123457
M3 - Article
AN - SCOPUS:85075520621
SN - 1385-8947
VL - 385
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 123457
ER -