说capacity 会随着current density 增大而降低?电化学初学者，有一问题向各位请教一下： 最近在一篇Goodenough文章中看到这么一个结论，说随着current density的提高，电池的capacity会随之下降。 按照文中解释是说，当外电路的electronic current density 较小时，可以与电池内部的ionic current density达到平衡，但是当ionic current density 到达极限时，增大electronic current density之后，capacity就会降低。我不是很能够理解他的capacity是根据什么来算的？ 原文如下： ”capacity decreases with the rate of charge or discharge, i.e. the magnitude of the electronic current in the external circuit, which must be matched by the internal ionic current within the battery. Since the ionic current density of the electrolyte and electrodes, including the rate of ion transfer? ???across the electrode/electrolyte interface, is much smaller than the electronic current density, the electrodes and electrolyte have a large surface are??and a small thickness. Nevertheless, at high current densities, the ionic motion within an electrode and/or across an electrode/electrolyte interface??is??too slow for the charge distribution to reach equilibrium, which is why the reversible capacity decreases with increasing current density in battey. -- Chem. Mater., Vol. 22, No. 3, 2010 (Challenges for rechargeable batteries)查看更多6个回答 . 8人已关注
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