Development of printable, flexible nickel‐iron batteries based on composite electrodes

  • Meng X
  • Wang Z
  • Di Benedetto G
  • et al.
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Abstract

We present flexible nickel‐iron batteries with printable multiwalled carbon nanotube (MWCNTs) based electrodes. All the metal composites are prepared via a single‐step precipitation reaction to synthesize metal hydroxides on the MWCNTs. High loading of the conductive materials enhances reactivity. Compared with Ni(OH) 2 ‐CNT, β‐NiOOH increases output energy due to higher discharge voltage in flexible cells. Cyclic voltammogram shows that the iron electrode underwent a two‐step redox reaction among Fe, Fe(II), and Fe(III). The flexible Ni‐Fe battery has higher charge‐discharge efficiency when using 6 M KOH electrolyte saturated with LiOH, and with 5% Co(NO 3 ) 2 added to anode. The anode exhibits a specific capacity of more than 300 mAh g −1 . All the components and the flexible cells themselves show good performance under bending conditions and the fabrication methods are also suitable for scale‐up via printing techniques.

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Meng, X., Wang, Z., Di Benedetto, G., Zunino, J. L., & Mitra, S. (2020). Development of printable, flexible nickel‐iron batteries based on composite electrodes. Energy Storage, 2(1). https://doi.org/10.1002/est2.105

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