Engineering 2D Nanofluidic Li-Ion Transport Channels for Superior Electrochemical Energy Storage.
basic_science · Level V
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- Record sourced from PubMed, PMID 29044794.
- Also identified by DOI 10.1002/adma.201703909.
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Abstract
Rational surface engineering of 2D nanoarchitectures-based electrode materials is crucial as it may enable fast ion transport, abundant-surface-controlled energy storage, long-term structural integrity, and high-rate cycling performance. Here we developed the stacked ultrathin Co<sub>3</sub> O<sub>4</sub> nanosheets with surface functionalization (SUCNs-SF) converted from layered hydroxides with inheritance of included anion groups (OH<sup>-</sup> , NO<sub>3</sub><sup>-</sup> , CO<sub>3</sub><sup>2-</sup> ). Such stacked structure establishes 2D nanofluidic channels offering extra lithium storage sites, accelerated Li-ion transport, and sufficient buffering space for volume change during electrochemical processes. Tested as an anode material, this unique nanoarchitecture delivers high specific capacity (1230 and 1011 mAh g<sup>-1</sup> at 0.2 and 1 A g<sup>-1</sup> , respectively), excellent rate performance, and long cycle capability (1500 cycles at 5 A g<sup>-1</sup> ). The demonstrated advantageous features by constructing 2D nanochannels in nonlayered materials may open up possibilities for designing high-power lithium ion batteries.