Expansion-tolerant architectures for stable cycling of ultrahigh-loading sulfur cathodes in lithium-sulfur batteries.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 31922008.
- Also identified by DOI 10.1126/sciadv.aay2757 and PMC identifier 6941919.
- Licence recorded as CC BY-NC.
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Abstract
Lithium-sulfur batteries can displace lithium-ion by delivering higher specific energy. Presently, however, the superior energy performance fades rapidly when the sulfur electrode is loaded to the required levels-5 to 10 mg cm<sup>-2</sup>- due to substantial volume change of lithiation/delithiation and the resultant stresses. Inspired by the classical approaches in particle agglomeration theories, we found an approach that places minimum amounts of a high-modulus binder between neighboring particles, leaving increased space for material expansion and ion diffusion. These expansion-tolerant electrodes with loadings up to 15 mg cm<sup>-2</sup> yield high gravimetric (>1200 mA·hour g<sup>-1</sup>) and areal (19 mA·hour cm<sup>-2</sup>) capacities. The cells are stable for more than 200 cycles, unprecedented in such thick cathodes, with Coulombic efficiency above 99%.