Ultrathin Al2O3-coated reduced graphene oxide membrane for stable lithium metal anode
来源期刊：Rare Metals2018年第6期
论文作者：Fan Zhang Fei Shen Zhao-Yang Fan Xin Ji Bin Zhao Zhou-Ting Sun Ying-Ying Xuan Xiao-Gang Han
文章页码：510 - 519
摘 要：Lithium（Li） metal has been considered as the most attractive anode materials for Li-ion batteries（LIBs）due to its high theoretic specific capacity. The formation of unstable solid electrolyte interphase（SEI） and dendritic Li on the metal anode, however, hindered its practical application. Herein, to address the issues, a Li-free electrode with ultrathin Al2O3 coated on reduced graphene oxide（rGO） membrane that covers a Cu foil current collector was developed. The composite electrode exhibits excellent interfacial protection of lithium metal deposited between Cu foil and rGO electrochemically. Firstly, it affords good Li+ permeability from the electrolyte. Secondly, the ultrathin Al2O3 has sufficient mechanical strength to inhibit the penetration of Li dendrite. Li metal was observed uniformly deposited between rGO membrane and Cu collector, and stable cycle performance of Li plating/stripping with Coulombic efficiency of 91.75% at the 100 th cycle is achieved in organic carbonate electrolyte without any additives.
Fan Zhang1,2，Fei Shen1,2，Zhao-Yang Fan1，Xin Ji1，Bin Zhao1,2，Zhou-Ting Sun1，Ying-Ying Xuan1,2，Xiao-Gang Han1,2
1. Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University2. Key Laboratory of Smart Grid of Shaanxi Province
摘 要：Lithium（Li） metal has been considered as the most attractive anode materials for Li-ion batteries（LIBs）due to its high theoretic specific capacity. The formation of unstable solid electrolyte interphase（SEI） and dendritic Li on the metal anode, however, hindered its practical application. Herein, to address the issues, a Li-free electrode with ultrathin Al2O3 coated on reduced graphene oxide（rGO） membrane that covers a Cu foil current collector was developed. The composite electrode exhibits excellent interfacial protection of lithium metal deposited between Cu foil and rGO electrochemically. Firstly, it affords good Li+ permeability from the electrolyte. Secondly, the ultrathin Al2O3 has sufficient mechanical strength to inhibit the penetration of Li dendrite. Li metal was observed uniformly deposited between rGO membrane and Cu collector, and stable cycle performance of Li plating/stripping with Coulombic efficiency of 91.75% at the 100 th cycle is achieved in organic carbonate electrolyte without any additives.
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