3 years ago

Engineering 2D Nanofluidic Li-Ion Transport Channels for Superior Electrochemical Energy Storage

Engineering 2D Nanofluidic Li-Ion Transport Channels for Superior Electrochemical Energy Storage
Chunshuang Yan, Yue Zhu, Guihua Yu, Chade Lv, Jingxue Sun, Gang Chen
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 Co3O4 nanosheets with surface functionalization (SUCNs-SF) converted from layered hydroxides with inheritance of included anion groups (OH−, NO3−, CO32−). 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−1 at 0.2 and 1 A g−1, respectively), excellent rate performance, and long cycle capability (1500 cycles at 5 A g−1). The demonstrated advantageous features by constructing 2D nanochannels in nonlayered materials may open up possibilities for designing high-power lithium ion batteries. The stacked ultrathin Co3O4 nanosheets with surface functionalization possess 2D nanofluidic channels for rapid Li-ion transport in both half- and full-cells.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201703909

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