期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 3, 页码 3087-3097出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b19593
关键词
macroporous conjugated polymer; graphene; SI-KCTP; iron doping; lithium-sulfur batteries
资金
- National Natural Science Foundation of China [51773211]
- National High Level Talents Special Support Plan of China
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- Beijing Municipal Science & Technology Commission
Porous conjugated polymers offer enormous potential for energy storage because of the combined features of pores and extended pi-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.
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