Comparative Study of Water-Based LA133 and CMC/SBR Binders for Sulfur Cathode in Advanced Lithium–Sulfur Batteries

Abstract

Two most widely used commercial water-based binders, polyacrylic latex (LA133) and sodium carboxymethyl cellulose/styrene butadiene rubber (CMC/SBR), are utilized for constructing sulfur cathodes to investigate their influence on the electrochemical properties of lithium–sulfur batteries. Compared with the CMC/SBR binder, the LA133 binder is found to possess not only higher charge densities (−49.6 versus −38.9 mV) but also better chain flexibility, which promises the homogeneous dispersion of the sulfur–carbon composite cathode materials and ensures an effective conducting framework, resulting in the high utilization of active sulfur. The electrode performance of the batteries further demonstrates that the LA133 cathode with higher dispersion degree delivers lower internal resistance, faster Li-ion diffusion rate, more efficient conversion of sulfur redox, higher reversible capacity (1176.2 versus 867.3 mAh g–1), and better rate capability and electrode stability.

A Sustainable Tamarind Kernel Powder Based Aqueous Binder for Graphite Anode in Lithium‐Ion Batteries

“…The conductivity of the graphite slurries was in the range of 1.03 to 1.10 mS cm −1 . The C‐TK4 exhibits a higher conductivity and Zeta potential values (Figure ), which are better than the reported values for graphite slurries with different aqueous binders of LA133 and CMC/SBR . Thus it suggests that a homogeneous slurry of C‐TK4 can be formed without any coagulation and flocculation.…”

Comparative study of water‐processable polymeric binders in LiMn2O4 cathode for aqueous electrolyte batteries

“…The linearity of each curve implies the insertion and extraction of Li+ is diffusion limited. [ 21,38 ] Additionally, the ratio of the anodic and cathodic current peak heights is close to one for PTFE, PTFE+CMC, SBR, and SBR+CMC, which reflects the reversible nature of the reaction. [ 39 ] The slopes of each line were used in conjunction with the Randles‐Sevcik equation, shown below in Equation (1), to determine the apparent diffusion coefficient for LiMn 2 O 4 in each electrode.…”

“…This is noteworthy, as it directly contradicts LA133's behavior reported in organic electrolytes. [ 16,21 ] Wang et al. specifically selected it as superior to SBR+CMC due to is versatility, stating its stability in a wide array of voltage windows enabling its use in the cathode and anode.…”

“…[ 39 ] The slopes of each line were used in conjunction with the Randles‐Sevcik equation, shown below in Equation (1), to determine the apparent diffusion coefficient for LiMn 2 O 4 in each electrode. [ 21,38,40 ] …”

“…PVDF poses serious safety and environmental concerns due to the use of N-methylpyrrolidinone (NMP) as its solvent, which is a volatile, flammable organic solvent known to cause environmental damage. [21][22][23] Beyond environmental concerns, the ease of electrode processing is one of the key advantages of aqueous electrolyte batteries. Using NMP during electrode processing would remove this advantage and increase cost, reducing the feasibility of use at utility scale.…”