摘要
Lithium(Li)metal has been regarded as one of the most promising anode materials to meet the urgent requirements for the next-generation high-energy density batteries.However,the practical use of lithium metal anode is hindered by the uncontrolled growth of Li dendrites,resulting in poor cycling stability and severe safety issues.Herein,vertical graphene(VG)film grown on graphite paper(GP)as an all-carbon current collector was utilized to regulate the uniform Li nucleation and suppress the growth of dendrites.The high surface area VG grown on GP not only reduces the local current density to the uniform electric field but also allows fast ion transport to homogenize the ion gradients,thus regulating the Li deposition to suppress the dendrite growth.The Li deposition can be further guided with the lithiation reaction between graphite paper and Li metal,which helps to increase lithiophilicity and reduce the Li nucleation barrier as well as the overpotential.As a result,the VG film-based anode demonstrates a stable cycling performance at a current density higher than 5mAcm^(-2)in half cells and a small hysteresis of 50mV at 1mAcm^(-2)in symmetric cells.This work provides an efficient strategy for the rational design of highly stable Li metal anodes.
出处
《Research》
EI
CAS
2020年第1期1222-1232,共11页
研究(英文)
基金
We appreciate support from the National Key Research and Development Program of China(2018YFE0124500 and 2019YFA0705700)
the National Natural Science Foundation of China(Nos.51972190 and 51932005)
the National Science Fund for Distinguished Young Scholars,China(No.51525204)
the Guangdong Natural Science Funds for Distinguished Young Scholars(2017B030306006)
the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(2017BT01N111)
the Shenzhen Basic Research Project(Grant Nos.JCYJ20170412171359175 and JCYJ20180508152037520)
the Shenzhen Graphene Manufacturing Innovation Center(201901161513 and 201901171523).