We employed a hard carbon (HC) anode for Na-ion batteries and replaced the conventional solvent-based binder (PVDF) with water-based binders (sodium alginate, CMC, SBR, and CMC–SBR mixtures). However, after switching to water-based binders, the electrochemical capacity decreased.
Could you please suggest a reason for the decrease in capacity or provide methods to improve it?
Since hard carbon is hydrophobic, the use of water-based binders may require a dispersant to achieve good dispersion. If a dispersant is necessary, could you suggest a suitable option?
Dear Periyasamy Anushkkaran
The capacity drop when using water-based binders for hard carbon (HC) anodes is mainly due to poor dispersion and wetting, since HC is hydrophobic and water-based binders (CMC, sodium alginate, SBR) are hydrophilic. This reduces electronic contact and Na⁺ diffusion. To improve performance:
The capacity decrease with water-based binders on hydrophobic hard carbon anodes is likely due to poor dispersion and weak adhesion. Improving capacity involves using dispersants or advanced binders like poly(fumaric acid) that enhance ion diffusion, electrode integrity, and cycling stability in Na-ion batteries.
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