One-Step Fast-Synthesized Foamlike Amorphous Co(OH)2 Flexible Film on Ti Foil by Plasma-Assisted Electrolytic Deposition as a Binder-Free Anode of a High-Capacity Lithium-Ion Battery.

This research prepared an amorphous Co(OH)2 flexible film on Ti foil using plasma-assisted electrolytic deposition within 3.5 min. Amorphous Co(OH)2 structure was determined by X-ray diffraction and X-ray photoelectron spectroscopy. Its areal capacity testing as the binder and adhesive-free anode of a lithium-ion battery shows that the cycling capacity can reach 2000 μAh/cm2 and remain at 930 μAh/cm2 after 50 charge-discharge cycles, which benefits from the emerging Co(OH)2 active material and amorphous foamlike structure. The research introduced a new method to synthesize amorphous Co(OH)2 as the anode in a fast-manufactured low-cost lithium-ion battery.