Stabilizing Zn₂SiO₄ Anode by a Lithium Polyacrylate Binder for Highly Reversible Lithium-Ion Storage

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Traditional binders in Zn2SiO4 anodes fail to manage volume expansion, leading to capacity loss.
• Electrode instability hinders the performance of Zn2SiO4 anodes in lithium-ion batteries.

Purpose of the Study:

• To enhance the mechanical stability and cycling longevity of Zn2SiO4 anodes.
• To investigate the use of hollow structures and a novel LiPAA binder for improved battery performance.

Main Methods:

• Fabrication of hollow Zn2SiO4 structures.
• Utilizing an aqueous lithium poly(acrylic acid) (LiPAA) binder.
• Electrochemical performance testing (capacity, current density, cycling).
• Ex situ X-ray diffraction and X-ray absorption spectroscopy for mechanism analysis.

Main Results:

• The LiPAA binder effectively buffered volume expansion and improved electrode integrity.
• Zn2SiO4 electrodes with LiPAA achieved 499 mAh g-1 at 5 A g-1 and 98% retention over 1000 cycles at 1 A g-1.
• A dual conversion-alloying mechanism involving Zn reduction and LiZn alloy formation was identified.

Conclusions:

• The combined strategy of hollow structure and LiPAA binder significantly enhances Zn2SiO4 anode performance.
• LiPAA is a promising binder for improving the cycling stability of conversion and alloying anodes.
• This approach offers a viable pathway for developing high-performance lithium-ion batteries.