Temperature dependence lithium polymer batteries

Wetjen M, Kim GT, Joost M, Winter M, Passerini S. Temperature dependence of electrochemical properties of cross-linked poly (ethylene oxide)/lithium bis(trifluoromethane-sulfonyl)imide/n-butyl-n-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide solid polymer electrolytes for lithium batteries. Electro-chimica Acta 2013 87 779-87. 

LiCl, LijO, which precipitate on the electrode surface. Reduction of solvents is followed by the formation of both insoluble SEI components like Li COj and partially soluble semicarbonates and polymers. The voltage at which the SEI is formed depends on the type of carbon, the catalytic properties of its surface (ash content, type of crystallographic plane, basal-to-edge plane ratio), temperature, concentration and types of solvents, salts and impurities, and on the current density. Eor lithium-ion battery electrolytes, is typically in the range 1.7-0.5 V vs Li reference electrode, but the SEI continues to form down to 0 V. In some cases, p is less than 100% during the first few cycles. This means that the completion of SEI formation may take several charge-discharge cycles. 

Solid polymer electrolytes for lithium batteries applications are commonly prepared by dissolving a lithium salt in poly(ethylene oxide) (PEO)-based materials. Chiappone et al. investigated these systems by a Li and NMR study yielding local dynamics and mass transport by temperature-dependent Ti and PFG-NMR diffusion measurements. 

---