Black phosphorus composites with engineered interfaces for high-rate high-capacity lithium storage.
basic_science · Level V
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- Record sourced from PubMed, PMID 33033214.
- Also identified by DOI 10.1126/science.aav5842.
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Abstract
High-rate lithium (Li) ion batteries that can be charged in minutes and store enough energy for a 350-mile driving range are highly desired for all-electric vehicles. A high charging rate usually leads to sacrifices in capacity and cycling stability. We report use of black phosphorus (BP) as the active anode for high-rate, high-capacity Li storage. The formation of covalent bonds with graphitic carbon restrains edge reconstruction in layered BP particles to ensure open edges for fast Li<sup>+</sup> entry; the coating of the covalently bonded BP-graphite particles with electrolyte-swollen polyaniline yields a stable solid-electrolyte interphase and inhibits the continuous growth of poorly conducting Li fluorides and carbonates to ensure efficient Li<sup>+</sup> transport. The resultant composite anode demonstrates an excellent combination of capacity, rate, and cycling endurance.