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Integrated Anode Electrode Composited Cu⁻Sn Alloy and Separator for Microscale Lithium Ion Batteries.

Materials 2019 Februrary 19
A novel integrated electrode structure was designed and synthesized by direct electrodepositing of Cu⁻Sn alloy anode materials on the Celgard 2400 separator (Cel-CS electrode). The integrated structure of the Cel-CS electrode not only greatly simplifies the battery fabrication process and increases the energy density of the whole electrode, but also buffers the mechanical stress caused by volume expansion of Cu⁻Sn alloy active material; thus, effectively preventing active material falling off from the substrate and improving the cycle stability of the electrode. The Cel-CS electrode exhibits excellent cycle performance and superior rate performance. A capacity of 728 mA·h·g-1 can be achieved after 250 cycles at the current density of 100 mA·g-1 . Even cycled at a current density of 5 A·g-1 for 650 cycles, the Cel-CS electrode maintained a specific capacity of 938 mA·h·g-1 , which illustrates the potential application prospects of the Cel-CS electrode in microelectronic devices and systems.

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