Abstract
Mass transport of lithium ions is one of the major limitations to the performance of high-rate lithium-ion batteries. This paper presents an analysis of a mass transport characterization method for gel electrolytes. The method is based on a Maxwell–Stefan transport model, which takes into account the polymer as an active specie in the transport. Nine apparent transport properties aredefined from the model and their dependence on the Maxwell–Stefan diffusivities and the thermodynamic enhancement factors are presented. The characterization method is analyzed by finding analytical expressions that describe the characterization experiments. From the expressions it can be seen how the nine apparent transport properties influence the experimental response. The conclusions ofthe analysis will be used later in a characterization of the gel electrolyte: LiPF6 –ethylene carbonate (EC)–propylene carbonate (PC)–poly(vinylidenefluoride-hexafluoropropylene) P(VdF-HFP).
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