整片三维纳米多孔铜为集流体的氧化亚铜膜电极的制备及储锂性能研究
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摘要
对Mn-35Cu合金采用化学腐蚀法可制备出一种结构均匀且平均孔径为100 nm的整片三维纳米多孔铜。随后,经300℃、0.5 h热处理,在三维纳米多孔铜孔壁表面进一步形成一层氧化亚铜薄膜,从而制备出三维纳米多孔铜为集流体的氧化亚铜膜电极。分别对该电极进行SEM、XRD及恒流充放电测试。结果表明,这种多孔氧化亚铜膜电极在0.1 m A/cm~2的电流密度下,首次放电比容量达1.29 m Ah/cm~2,最高可逆比容量达0.89 m Ah/cm~2。60周循环后,该电极可逆比容量仍有0.56 m Ah/cm~2,容量保持率为62.9%,表明在下一代高性能锂离子电池中具有潜在的应用前景。高比表面积的氧化亚铜薄膜和独特的纳米多孔结构是该电极具有优异储锂性能的主要原因。
Monolithic 3D nanoporous Cu with homogeneous structure and average pore diameter of 100 nm was fabricated by chemical etching for Mn-35 Cu alloy. Subsequently, Cu_2O film electrode taking 3D nanoporous Cu as current collector was prepared successfully by heat treatment of the nanoporous Cu at 300 ℃ for 0.5 h due to the further formation of Cu_2O film layer on the surface of ligaments of nanoporous Cu. The electrode was characterized by SEM, XRD and constant current charge-discharge test, respectively. The results show that the porous Cu_2O film electrode delivers the first discharge capacity of 1.29 m Ah/cm~2 and the maximum reversible capacity of 0.89 m Ah/cm~2 at the current density of 0.1 m A/cm~2. There still remains a reversible capacity of 0.56 m Ah/cm~2 after 60 cycles with capacity retention of 62.9%, which indicates its potential application in the next-generation high-performance lithium-ion batteries. The optimum lithium storage properties of the electrode can be mainly attributed to Cu_2O film with high specific surface area and unique nanoporous structure.
Monolithic 3D nanoporous Cu with homogeneous structure and average pore diameter of 100 nm was fabricated by chemical etching for Mn-35 Cu alloy. Subsequently, Cu_2O film electrode taking 3D nanoporous Cu as current collector was prepared successfully by heat treatment of the nanoporous Cu at 300 ℃ for 0.5 h due to the further formation of Cu_2O film layer on the surface of ligaments of nanoporous Cu. The electrode was characterized by SEM, XRD and constant current charge-discharge test, respectively. The results show that the porous Cu_2O film electrode delivers the first discharge capacity of 1.29 m Ah/cm~2 and the maximum reversible capacity of 0.89 m Ah/cm~2 at the current density of 0.1 m A/cm~2. There still remains a reversible capacity of 0.56 m Ah/cm~2 after 60 cycles with capacity retention of 62.9%, which indicates its potential application in the next-generation high-performance lithium-ion batteries. The optimum lithium storage properties of the electrode can be mainly attributed to Cu_2O film with high specific surface area and unique nanoporous structure.
引文
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