Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 5, Pages 4767-4775Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b19181
Keywords
synthesis; amine; Sulfur; composite; cathode
Funding
- National Research Foundation (NRF) - Ministry of Science, Information and Communication Technologies and Future Planning [NRF-2015K1A1A2029679]
- National Research Foundation of Korea - Ministry of Science, Information and Communication Technologies and Future Planning [NRF-2015M3A7B4050306]
- National Research Council of Science and Technology, Republic of Korea [CAP-15-02-KBSI]
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Recently, the achievement of newly designed carbon-sulfur composite materials has attracted a tremendous amount of attention as high-performance cathode materials for lithium-sulfur batteries. To date, sulfur materials have been generally synthesized by a sublimation technique in sealed containers. This is a well-developed technique for the synthesizing of well-ordered sulfur materials, but it is limited when used to scale up synthetic procedures for practical applications. In this study, we suggest an easily scalable, room-temperature/ambient-pressure chemical pathway for the synthesis of highly functioning cathode materials using electrostatically assembled, amine-terminated carbon materials. It is demonstrated that stable cycling performance outcomes are achievable with a capacity of 730 mAhg(-1) at a current density of 1 C with good cycling stability by a virtue of the characteristic chemical/physical properties (a high conductivity for efficient charge conduction and the presence of a number of amine groups that can interact with sulfur atoms during electrochemical reactions) of composite materials. The critical roles of conductive carbon moieties and amine functional groups inside composite materials are clarified with combinatorial analyses by X-ray photoelectron spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy.
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