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

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. K E Y W O R D Scarbon nanotube, flexible nickel-iron battery, printable battery

Design and synthesis of high performance flexible and green supercapacitors made of manganese‐dioxide‐decorated alkali lignin

“…Active lignin from quinol/ubiquinol enzymes (Q/QH 2 ) redox moieties has recently garnered a lot of attention 43 . MWCNTs were derived from lignin to make printable MWCNT‐based electrodes and RUO 2 /MWCNT nanocomposites as active material for electrodes 44,45 . Most of the studies report the use of lignin as a carbon precursor, or it is pretreated and then combined with conducting polymers, transition metal oxides, etc.…”

Formation of Fe‐embedded graphitic carbon network composites as anode materials for rechargeable Fe‐air batteries

“…Although much research still focuses on Li-ion batteries, [2][3][4][5] new research focusing on metal-air batteries (MABs) as safer and more environmentally friendly energy storage devices is ongoing. [6][7][8][9] In addition to safety, the disposal of used batteries has also raised concerns; therefore, recyclability and control of the contamination risk posed by the materials used in batteries warrant attention. MABs have a metal (eg, Fe, 7,10 Zn, 11 or Al 12 ) as their anode electrode, whereas oxygen (O 2 ) from air is used as the fuel for the cathode electrode.…”

“…The rapid development of electric vehicles and wearable devices in the era of the Internet of things has increased demand for safer and higher–energy‐density batteries. Although much research still focuses on Li‐ion batteries, 2‐5 new research focusing on metal‐air batteries (MABs) as safer and more environmentally friendly energy storage devices is ongoing 6‐9 . In addition to safety, the disposal of used batteries has also raised concerns; therefore, recyclability and control of the contamination risk posed by the materials used in batteries warrant attention.…”