Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 49, Pages 45785-45795Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b17209
Keywords
lithium-sulfur batteries; sulfur copolymers; short-chain polyselenosulfide copolymers; selenium doping; electrical conductivity enhancement
Funding
- Korea Institute of Science and Technology (KIST) Institutional Program [2E29520]
- National Research Foundation of Korea (NRF) - Korea government (MEST) [NRF-2019R1A2C2005657]
- National Research Foundation of Korea [2E29520] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Copolymerization of sulfur, which forms sulfur-rich polymers, has recently opened a new era in the lithium-sulfur (Li-S) battery research as improved battery performances could be achieved compared to pure sulfur (S-8). By means of organic chemistry, sulfur copolymers with desired features and chemical structures could be rationally designed and synthesized. In this study, sulfur-rich polymers consisting of short-chain tetrasulfide (R-S-4-R) (PTS) and selenotrisulfide (R-SeS3-R) (PTSeS) bonds are suggested as cathode materials for Li-S batteries. Intrinsically short poly(seleno)sulfide bonds along with covalent anchoring effect effectively suppress the parasitic shuttle effect originating from soluble long-chain lithium polysulfides formed from pure S-8. Furthermore, a comparative study demonstrates the indisputable advantage of the selenium doping, which enhances the electrical conductivity of the polymer and following battery performances. In terms of cycling performance, both PTSeS and PTS with similar to 2 mg cm(-2) polymer loading exhibit small capacity decays of 0.078 and 0.052% per cycle until 500 cycles at 0.5C, respectively. However, active material utilization and high rate performance are substantially superior in PTSeS due to the enhanced electron transfer kinetics. This work would provide useful design principles for fabrication of sulfur-based polymers with even greater applicability in future Li-S batteries.
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