摘要
The intense interest of Li–O_2 battery stems from its ultrahigh theoretical energy density, but its application is still hindered by the issues of Li anode. Herein, RuO_2-CNTs composite, a conventional O_2 cathode catalyst in Li–O_2 battery, is first utilized as an anode host for dendrite-free Li plating/stripping with high Coulombic efficiency. It is demonstrated that such excellent plating/stripping performance arises from the lithiophilicity characteristic of Ru nanoparticles(that is derived from the in-situ electrochemical conversion from RuO_2 to Ru/Li_2O) and buffer space provided by CNTs. Furthermore, the RuO_2-CNTs electrode pre-deposited with limited Li(RuO_2-CNTs@Li anode) is coupled with a RuO_2-CNTs catalytic cathode to form a Li–O_2 full cell, which displays an extended cycle life with dramatically improved energy density.The achieved cell shows a high stability of 200 cycles with RuO_2-CNTs@Li anode(1 mg Li) that sheds light on the efficient utilization of Li anode in Li–O_2 batteries.
The intense interest of Li–O_2 battery stems from its ultrahigh theoretical energy density, but its application is still hindered by the issues of Li anode. Herein, RuO_2-CNTs composite, a conventional O_2 cathode catalyst in Li–O_2 battery, is first utilized as an anode host for dendrite-free Li plating/stripping with high Coulombic efficiency. It is demonstrated that such excellent plating/stripping performance arises from the lithiophilicity characteristic of Ru nanoparticles(that is derived from the in-situ electrochemical conversion from RuO_2 to Ru/Li_2O) and buffer space provided by CNTs. Furthermore, the RuO_2-CNTs electrode pre-deposited with limited Li(RuO_2-CNTs@Li anode) is coupled with a RuO_2-CNTs catalytic cathode to form a Li–O_2 full cell, which displays an extended cycle life with dramatically improved energy density.The achieved cell shows a high stability of 200 cycles with RuO_2-CNTs@Li anode(1 mg Li) that sheds light on the efficient utilization of Li anode in Li–O_2 batteries.
引文
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