Effect of binders on the performance of hard carbon anode material
Hard carbon as an anode material for sodium-ion battery has advantages such as low cost,high capacity and good cycle performance.The selection of different types of binders has a significant impact on the performance of hard carbon materials.Select oil-based polyvinylidene fluoride(PVDF)binder and water-based sodium alginate(SA),sodium polyacrylate(PAANa)and carboxymethyl cellulose(CMC)binder to study the effect of binder types on the performance of hard carbon materials.Compared to oil-based binders,water-based binders are more suitable for hard carbon.SEM and electrode resistivity results show that water-based binders have better dispersion effect and lower electrode resistivity.The electrochemical test results show that the electrochemical performance of the batteries prepared with water-based binders is better,with the initial Coulombic efficiency(ICE)higher than 87％,while the ICE of the batteries prepared with oil-based binder PVDF is only 70.5％.The batteries prepared with SA and PAANa water-based binders have a reversible capacity stable at around 320 mAh/g after 100 cycles at 1.0 C in 0.01-2.50 V,while the batteries prepared with CMC and PVDF only have 270 mAh/g and 260 mAh/g,respectively.The electrochemical impedance of the batteries prepared with SA and PAANa is the lowest.
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