Abstract
The space charge layer (SCL) effects were initially developed to explain the anomalous conductivity enhancement in composite ionic conductors. They were further extended to qualitatively as well as quantitatively understand the interfacial phenomena in many other ionic-conducting systems. Especially in nanometre-scale systems, the SCL effects could be used to manipulate the conductivity and construct artificial conductors. Recently, existence of such effects either at the electrolyte/cathode interface or at the interfaces inside the composite electrode in all solid state lithium batteries (ASSLB) has attracted attention. Therefore, in this article, the principle of SCL on basis of defect chemistry is first presented. The SCL effects on the carrier transport and storage in typical conducting systems are reviewed. For ASSLB, the relevant effects reported so far are also reviewed. Finally, the perspective of interface engineer related to SCL in ASSLB is addressed.
Highlights
Space charge layer (SCL) effects correspond to carrier redistribution at space charge regions near a two-phase contact
SCL effects proved to be of great importance for ion conduction in solids, especially if the interfacial spacing is on the nanometre scale
The SCL effects at the interfaces relate to the carrier redistribution near the two-phase boundary, which is led by the SCL potential derived from the requirement of thermodynamic equilibrium at the contact between the two phases
Summary
Space charge layer (SCL) effects correspond to carrier redistribution at space charge regions near a two-phase contact. At the boundary between the two materials, carrier redistribution in the space charge region is required from the thermodynamical point of view (uniformity of electrochemical potential).[23] The following discussion seems more closely related to a lateral two-phase contact, the basic knowledge is applied to the interface in the systems including polycrystalline or composited materials. For θ± = 0, i.e. ζ±0 = 1, the defect chemistry in the space charge region is the same as in the bulk It approaches +1 for maximum enrichment (ζ±0 >>1) and –1 for maximum depletion (ζ±0 ƒ
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