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zhangj199305新蟲 (小有名氣)
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說capacity 會隨著current density 增大而降低? 已有6人參與
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電化學(xué)初學(xué)者,有一問題向各位請教一下: 最近在一篇Goodenough文章中看到這么一個結(jié)論,說隨著current density的提高,電池的capacity會隨之下降。 按照文中解釋是說,當(dāng)外電路的electronic current density 較小時,可以與電池內(nèi)部的ionic current density達(dá)到平衡,但是當(dāng)ionic current density 到達(dá)極限時,增大electronic current density之后,capacity就會降低。我不是很能夠理解他的capacity是根據(jù)什么來算的? 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) |
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