Partially Fluorinated Ether as an Electrolyte Additive to Modify Electrode Surface and Suppress Dissolution of Polysulfides in Li-S Batteries

Abstract1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE), a kind of fluorinated ether, was used as an electrolyte additive for Li-S batteries. A compact, smooth, and homogenous surface layer was formed on lithium anode at the optimized amount of added TTE. In addition, TTE additive played a crucial role in modifying the composition of the passivation layer on the sulfur/carbon cathode. Consequently, the dissolution and shuttling of polysulfides were effectively prevented. The reversible capacity, initial coulombic efficiency, electrode reaction kinetic, and cycling stability of Li-S batteries were greatly improved.

Novel functional carboxymethyl cellulose lithium (CMC-Li) for enhanced performance of lithium-ion batteries

Using cotton as raw material we have synthesized CMC-Li. A new method to modify electrode materials with CMC-Li by electrospinning was developed, and CMC-Li was used as a novel lithium-ion binder in batteries. The batteries show good electrochemical properties, excellent stability and are environmentally friendly.