Lithium polyacrylate as a binder for tin-cobalt-carbon negative electrodes in lithium-ion batteries

In this article, PVDF binder was demonstrated that there is poor capability retention. By contrast, PAA-Li binder is showing excellent capacity retention for Sn₃₀Co₃₀C₄₀ materials and a specific capacity of 450 mAh/g is achieved for at least 100 cycles.

A lithium polyacrylate (Li-PAA) binder has been developed by 3M Company that is useful with electrodes comprising alloy anode materials. This binder was used to prepare electrodes made with Sn₃₀Co₃₀C₄₀ material prepared by mechanical attrition. The electrochemical performance of electrodes using Li-PAA binder was characterized and compared to those using sodium carboxymethyl cellulose (CMC) and polyvinylidene fluoride (PVDF) binders. The Sn₃₀Co₃₀C₄₀ electrodes using Li-PAA and CMC binders show much smaller irreversible capacity than the ones using PVDF binder. Poor capacity retention is observed when PVDF binder is used. By contrast, the electrodes using Li-PAA binder show excellent capacity retention for Sn₃₀Co₃₀C₄₀ materials and a specific capacity of 450 mAh/g is achieved for at least 100 cycles. The results suggest that Li-PAA is a promising binder for electrodes made from large-volume change alloy materials.

http://dx.doi.org/10.1016/j.electacta.2010.01.011

Lithium polyacrylate as a binder for tin–cobalt–carbon negative electrodes in lithium-ion batteries