To solve the cycle life problem for high-energy and low-cost Li-S batteries, we combine materials chemistry and surface science to understand the fundamental chemical interactions at electrode/electrolyte interfaces and to design better cathode material structures accordingly. The key is to trap the dissolvable lithium polysulfide (LPS) intermediates in the cathode as well as to promote their electrochemical redox conversion. We employ model material synthesis, electrochemical techniques, surface-sensitive spectroscopic tools and computational simulations to study the surface chemistry of LPS on trap materials. We design and synthesize multi-component cathode material structures that maintain high and stable capacity over long-term cycling for rechargeable Li-S batteries.

Surface chemistry and cathode materials design for lithium-sulfur batteries

254th National Meeting (2017)

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