摘要
Sodium metal anode has been attracting widely research attention due to its large capacity and low electrode potential as the anode of sodium-ion batteries.However,the uncontrollable growth of Na dendrite is one of the critical issues for its real applications.Herein,a three-dimensional(3 D) nanostructure composed of gold nanoparticles(Au NPs) supported on 3 D carbon nanotube-graphene foam(3 D CNT-GF)was designed and fabricated as the host of sodium metal anode.Na@3 D Au/CNT-GF anode can deliver a Coulombic efficiency of 99.14% and stably cycle for 2600 h at 1 mA cm^(-2) with 1 mAh cm^(-2).It can cycle for 300 h at 5 mA cm^(-2) with 1 mAh cm^(-2).Detailed results indicate that its excellent electrochemical performance can be attributed to the unique macroporous structure and sodiophilic surface formed by Au NPs guiding the uniform sodium metal deposition enabled a dendrite-free morphology investigated by the ex-situ SEM and in-situ optical microscopy.At last,a full cell was assembled with Na@3 D Au/CNT-GF as the anode and Na_(3) V_(2)(PO_(4))_(3)@C as the cathode.It can deliver a capacity of 84.6 mAh g^(-1) at 100 mA g^(-1)after 200 cycles.Our results demonstrate that 3 D Au/CNT-GF is a promising sodium metal anode host.
基金
supported by the National Natural Science Foundation of China (Grant No. U1804132)
the Zhongyuan Youth Talent support program of Henan province (Grant No. ZYQR201912152)
the Academic Improvement Program of Physics of Zhengzhou University (Grant No. 2018WLTJ02)
the Zhengzhou University Youth Talent Start-up Grant。
