Cycling-Induced Capacity Increase of Graphene Aerogel/ZnO Nanomembrane Composite Anode Fabricated by Atomic Layer Deposition

Nanoscale Research Letters

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[1] 0000 0001 0125 2443, grid.8547.e, Department of Materials Science, Fudan University, 200433, Shanghai, People’s Republic of China;0000000119573309, grid.9227.e, Center for Excellence in Superconducting Electronics (CENSE), State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and information Technology, Chinese Academy of Science, 20050, Shanghai, People’s Republic of China;

关键词: Zinc oxide;    Graphene aerogel;    Atomic layer deposition;    Capacity increase;    Lithium-ion batteries;   

DOI  :  10.1186/s11671-019-2900-7

来源: publisher

【 摘 要 】

Zinc oxide (ZnO) nanomembranes/graphene aerogel (GAZ) composites were successfully fabricated via atomic layer deposition (ALD). The composition of GAZ composites can be controlled by changing the number of ALD cycles. Experimental results demonstrated that the anode made from GAZ composite with ZnO nanomembrane of 100 ALD cycles exhibited highest specific capacity and best rate performance. A capacity increase of more than 2 times during the first 500 cycles was observed, and a highest capacity of 1200 mAh g−1 at current density of 1000 mA g−1 was observed after 500 cycles. On the basis of detailed electrochemical investigations, we ascribe the remarkable cycling-induced capacity increase to the alloying process accompanied by the formation of a polymer layer resulting from kinetically activated electrolyte degradation at low voltage regions.

【 授权许可】

CC BY