Earth Abundant Fe/Mn-Based Layered Oxide Interconnected Nanowires for Advanced K-Ion Full Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 27959573.
- Also identified by DOI 10.1021/acs.nanolett.6b04611.
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Abstract
K-ion battery (KIB) is a new-type energy storage device that possesses potential advantages of low-cost and abundant resource of K precursor materials. However, the main challenge lies on the lack of stable materials to accommodate the intercalation of large-size K-ions. Here we designed and constructed a novel earth abundant Fe/Mn-based layered oxide interconnected nanowires as a cathode in KIBs for the first time, which exhibits both high capacity and good cycling stability. On the basis of advanced in situ X-ray diffraction analysis and electrochemical characterization, we confirm that interconnected K<sub>0.7</sub>Fe<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>2</sub> nanowires can provide stable framework structure, fast K-ion diffusion channels, and three-dimensional electron transport network during the depotassiation/potassiation processes. As a result, a considerable initial discharge capacity of 178 mAh g<sup>-1</sup> is achieved when measured for KIBs. Besides, K-ion full batteries based on interconnected K<sub>0.7</sub>Fe<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>2</sub> nanowires/soft carbon are assembled, manifesting over 250 cycles with a capacity retention of ∼76%. This work may open up the investigation of high-performance K-ion intercalated earth abundant layered cathodes and will push the development of energy storage systems.