High-performance anode material for Li-ion batteries from bismuth molybdate incorporating F-free binder

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Bismuth molybdate (BMO) is a promising anode material for high-performance lithium-ion batteries (LIBs).
• Traditional polyvinylidene fluoride (PVDF) binder negatively impacts BMO performance and is environmentally unfavorable.
• There is a critical need for eco-friendly binders that improve BMO stability and electrochemical properties.

Purpose of the Study:

• To synthesize bismuth molybdate (BMO) material at a low annealing temperature.
• To evaluate the electrochemical performance of BMO using poly(acrylic acid) (PAA) versus polyvinylidene fluoride (PVDF) binders.
• To demonstrate a superior, environmentally friendly anode material for LIBs.

Main Methods:

• Low-temperature annealing (200 °C) in air to synthesize BMO.
• Material characterization using X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS).
• Electrochemical performance testing of BMO electrodes with PAA and PVDF binders in LIBs.

Main Results:

• Synthesized polycrystalline Bi₂MoO₆ with specific grain and rod morphologies, alongside an amorphous phase.
• BMO electrodes with PAA binder (BMO_PAA) exhibited significantly enhanced performance over PVDF binder (BMO_PVDF).
• BMO_PAA achieved a 60th-cycle specific capacity of 738 mAh g^-1 at 0.1 A g^-1, compared to 202 mAh g^-1 for BMO_PVDF.

Conclusions:

• Poly(acrylic acid) (PAA) is a superior, environmentally friendly binder for bismuth molybdate (BMO) anodes in lithium-ion batteries.
• The BMO_PAA system demonstrates enhanced electrochemical performance and cycle stability.
• This study presents a viable, fluorine-free binder solution for advanced LIB anode materials.