TY - JOUR
T1 - Synthesis of a Macroporous Conjugated Polymer Framework
T2 - Iron Doping for Highly Stable, Highly Efficient Lithium-Sulfur Batteries
AU - Jia, Pan
AU - Hu, Tianding
AU - He, Qingbin
AU - Cao, Xiao
AU - Ma, Junpeng
AU - Fan, Jingbiao
AU - Chen, Quan
AU - Ding, Yihong
AU - Pyun, Jeffrey
AU - Geng, Jianxin
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (51773211), the National High Level Talents Special Support Plan of China, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, and Beijing Municipal Science & Technology Commission.
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2019/1/23
Y1 - 2019/1/23
N2 - Porous conjugated polymers offer enormous potential for energy storage because of the combined features of pores and extended π-conjugated structures. However, the drawbacks such as low pore volumes and insolubilities of micro- and mesoporous conjugated polymers restrict the loading of electroactive materials and thus energy storage performance. Herein, we report the synthesis of iron-doped macroporous conjugated polymers for hosting sulfur as the cathode of high-performance lithium-sulfur (Li-S) batteries. The macroporous conjugated polymers are synthesized via in situ growth of poly(3-hexylthiophene) (P3HT) from reduced graphene oxide (RGO) sheets, followed by gelation of the composite (RGO-g-P3HT) in p-xylene and freeze-drying. The network structures of the macroporous materials can be readily tuned by controlling the chain length of P3HT grafted to RGO sheets. The large pore volumes of the macroporous RGO-g-P3HT materials (ca. 34 cm 3 g -1 ) make them excellent frameworks for hosting sulfur as cathodes of Li-S batteries. Furthermore, incorporation of Fe into the macroporous RGO-g-P3HT cathode results in reduced polarization, enhanced specific capacity (1,288, 1,103, and 907 mA h g -1 at 0.05, 0.1, and 0.2 C, respectively), and improved cycling stability (765 mA h g -1 after 100 cycles at 0.2 C). Density functional theory calculations and in situ characterizations suggest that incorporation of Fe enhances the interactions between lithium polysulfides and the P3HT framework.
AB - Porous conjugated polymers offer enormous potential for energy storage because of the combined features of pores and extended π-conjugated structures. However, the drawbacks such as low pore volumes and insolubilities of micro- and mesoporous conjugated polymers restrict the loading of electroactive materials and thus energy storage performance. Herein, we report the synthesis of iron-doped macroporous conjugated polymers for hosting sulfur as the cathode of high-performance lithium-sulfur (Li-S) batteries. The macroporous conjugated polymers are synthesized via in situ growth of poly(3-hexylthiophene) (P3HT) from reduced graphene oxide (RGO) sheets, followed by gelation of the composite (RGO-g-P3HT) in p-xylene and freeze-drying. The network structures of the macroporous materials can be readily tuned by controlling the chain length of P3HT grafted to RGO sheets. The large pore volumes of the macroporous RGO-g-P3HT materials (ca. 34 cm 3 g -1 ) make them excellent frameworks for hosting sulfur as cathodes of Li-S batteries. Furthermore, incorporation of Fe into the macroporous RGO-g-P3HT cathode results in reduced polarization, enhanced specific capacity (1,288, 1,103, and 907 mA h g -1 at 0.05, 0.1, and 0.2 C, respectively), and improved cycling stability (765 mA h g -1 after 100 cycles at 0.2 C). Density functional theory calculations and in situ characterizations suggest that incorporation of Fe enhances the interactions between lithium polysulfides and the P3HT framework.
KW - SI-KCTP
KW - graphene
KW - iron doping
KW - lithium-sulfur batteries
KW - macroporous conjugated polymer
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U2 - 10.1021/acsami.8b19593
DO - 10.1021/acsami.8b19593
M3 - Article
C2 - 30586280
AN - SCOPUS:85059654484
VL - 11
SP - 3087
EP - 3097
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 3
ER -