High electrochemical performance bendable Li secondary batteries based on a three-dimensional metal foam-type current collector

作者：Song Kyung Yup; Joo Seung Ki

来源：Materials Research Bulletin, 2017, 94: 328-334.

DOI：10.1016/j.materresbull.2017.06.026

• Lithium secondary battery
• Bendable battery
• Three-dimensional structured current
• collector
• Nickel-chromium alloy metal foam
• Areal capacity

Bendable lithium secondary batteries have many limitations, including low electrochemical performances and poor mechanical flexibility. Here, we bendable pouch batteries are fabricated using LiFePO4/C as the active material and three-dimensional Nickel-Chroinium alloy metal foam as the current collector of positive electrodes. The advantages of using the three-dimensional structured metal foam include a high surface area for the redox reaction, high electronic conductivity, and short diffusion length for the lithium ion. We demonstrate the use of bendable lithium secondary batteries with a high areal capacity of about 3.5 mAh cm(-2) at C-rate of 0.2, a high capacity retention rate in cycle life behavior, and a greatly low charge transfer resistance of around 6-8 Omega. Moreover, our bendable pouch batteries can be repeatedly bent to radii of 12.5 and 2.5 mm for several hundred times without fractures in the electrode and capacity fading.

• 出版日期2017-10