Abstract
Uncontrolled growth of lithium dendrite will lead to low Coulombic efficiency and poor cycle stability,which hinders the commercialization of lithium metal batteries.Herein,a novel modified lithium anode with reduced graphene oxide conductive network containing trace lithiophilic phosphorus(P-rGO/Cu)is prepared by electrospraying technique combined with heat treatment process.The rGO layer has a concave and undulating conductive structure,which can significantly improve the effective electrical contact between lithium metal and the current collector,speed up the kinetics of interfacial elec-tron transport and reaction,and improve the resistance of the negative electrode to the internal stress caused by volume change of the lithium,which is advantageous for the stability of the SEI film.The extremely small and uniformly distributed red phosphorus element avoids the volume change caused by lithiation to the maximum extent.Lithiophilic two-phase compound Li3P obtained by alloying P with Li can directionally induce the homoge-neous nucleation and dense deposition of lithium metal,address the issue of lithium dendrites and extend the cycle life of the batteries.The obtained P-rGO/Cu exhibits excellent electrochemical performance with an average Coulombic efficiency(CE)of 98％at a current density of 1 mA.cm-2 for 400 cycles,and the capacity retention rate of the full cell matched with lithium iron phosphate(LFP)is 83％after 400 cycles at 1C.
基金项目
Key-Area Research and Development Program of Guangdong Province(2020B090919003)
国家自然科学基金(52261160384)
国家自然科学基金(51872157)
国家自然科学基金(52072208)
Fundamental Research Project of Shenzhen(JCYJ20190808153609561)
Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(2017BT01N111)
Support Plan for Shenzhen Manufacturing Innovation Center(20200627215553988)
Materials and Devices Testing Center of Tsinghua University Shenzhen International Graduate School(Tsinghua SIGS)()
NETL
NSTL
万方数据