Journal
ACS ENERGY LETTERS
Volume 2, Issue 5, Pages 1232-1239Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00289
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Funding
- National Research Foundation of Korea Grant - Korean Government (MEST) [NRF-2014R1A1A2056199, NRF-2016M1B3A1A01937431]
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Formation of soluble polysulfide (PS), which is a key feature of lithium sulfur (Li-S) batteries, provides a fast redox kinetic based on a liquid-solid mechanism; however, it imposes the critical problem of PS shuttle. Here, we address the dilemma by exploiting a solvent-swollen polymeric single-ion conductor (SPSIC) as the electrolyte medium of the Li-S battery. The SPSIC consisting of a polymeric single-ion conductor and lithium salt-free organic solvents provides Li ion hopping by forming a nanoscale conducting channel and suppresses PS shuttle according to the Donnan exclusion principle when being employed for Li-S batteries. The organic solvents at the interface of the sulfur/carbon composite and SPSIC eliminate the poor interfacial contact and function as a soluble PS reservoir for maintaining the liquid-solid mechanism. Furthermore, the quasi-solid-state SPSIC allows the fabrication of a bipolar-type stack, which promises the realization of a high-voltage and energy-dense Li-S battery.
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