Recently, the research team of Jiaotong University developed the overpotential kinetic equation of lithium air battery.

FIG. 1. (a, b) guide hole carbon film (HPCM) both the front and SEM figure;(c, d) blind hole carbon film (HPCM/c) of both the front and scanning electron microscopy (SEM).Positive refers to the battery when assembling, lithium is opposite the carbon membrane surface.


Figure 2. (a) different macroporous structure of carbon membrane assembly drawing (lithium air batteries;(b) different macroporous structure charge-discharge curves of carbon membrane.(c) different macroporous structure ratio performance of carbon membrane.(d) different macroporous structure carbon film capacity retention under different current density.

Non-aqueous lithium air batteries because has the advantages of high energy density, green environmental protection, is currently the focus of electrochemical energy storage system, but there is a low performance, high overpotential and cycle performance such as a series of problems.Traditional cathode catalyst is often design ChengJie pore structure to provide a lithium air batteries required large amounts of oxygen reduction or oxygen precipitation of the active site.However the generated micron size of the discharge products tend to block the cathode catalyst materials mesoporous channel, not only affect the charging and discharging process of electrolyte transport and air diffusion, still can cause catalyst deactivation, lead to charge and discharge voltage is too high.It is generally believed that large pore structure is to promote the electrolyte or reactant on the active site of transmission, and will not increase the activity of the catalyst surface.As the main storage space of micron size product discharge, macroporous has what influence on the performance of lithium air batteries, lithium air batteries have high potential associated with what is problem widely concerned by researchers.

Recently, the Shanghai Jiaotong University, college of chemistry and chemical engineering professor sheng, Kai-xue Wang Chen, a researcher at team in exploring the dynamics of lithium air batteries macroporous overpotential behavior made important progress, zno nanorod array as hard template, reverse phase introduced by honeycomb briquet hole hole, won the support of the multistage aperture carbon film;By adjusting the precursor sol dipping in zinc oxide template height, was prepared with multistage aperture of the conduction macroporous structure carbon film and a closed hole, side hole of carbon membrane, used as a lithium air battery cathode without binder self-supporting, won the excellent ratio of performance.Found big holes on the surface of the electrode cross-sectional area is lithium air batteries constant exile electric voltage hysteresis curve of a main factor, and based on macroporous cross-sectional area and lithium ion migration process of solid instead should establish the dynamics equation of lithium air batteries overpotential.

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