Journal
FRONTIERS IN CHEMISTRY
Volume 7, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2019.00714
Keywords
Li metal anode; three-dimensional VG; CC; dendrite-free; excellent electrochemical performance; long cycle stability
Categories
Funding
- National Natural Science Foundation of China [21603192, 51802288, U1804132]
- China Postdoctoral Science Foundation [2017M622369]
- Academic Improvement Program of Physics, Zhengzhou University [35910121]
- Zhengzhou University Youth Talent Startup Grant [32310147]
- Outstanding Young Talent Research Fund of Zhengzhou University [1521317005]
- (Key) Project of Department of Education of Guangdong Province [2016KZDXM008]
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Lithium metal is deemed as an ideal anode material for next-generation lithium ion batteries (LIBs) due to its high specific capacity and low redox potential. However, uncontrolled lithium dendrite formation during electrochemical deposition leads to a low Coulombic efficiency and serious safety issues, dragging metallic lithium anodes out of practical application. One promising strategy to suppress lithium dendrite issues is employing a three-dimensional host with admirable conductivity and large surface area. Herein, a vertical graphene nanosheet grown on carbon cloth (VG/CC) synthesized is adopted as the Li deposition host. The three-dimensional VG/CC with a large surface area can provide abundant active nucleation sites and effectively reduce the current density, leading to homogeneous Li deposition to overcome the dendrite issue. The Li@VG/CC anode exhibits a dendrite-free morphology after a long cycle and superior electrochemical performance to that of planar Cu current collector. It delivers a small voltage hysteresis of 90.9 mV at a high current density of 10 mA cm(-2) and a Coulombic efficiency of 99% over 100 cycles at 2 mA cm(-2). Our results indicate that this all-carbon-based nanostructure host has great potential for next-generation Li metal batteries.
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