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全固态锂电池中电极/电解质界面处的空间电荷层
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全固态锂电池中用过渡金属氧化物做正极，硫化物做为电解质时，由于Li+在两种材料中的电化学势不同，会出现类似于电子导体中的pn结，即Li+在电解质/电极界面分布随空间发生变化，形成空间电荷层，空间电荷层导致高界面电阻？这是文献中说的原因，有没有高手说一说这是什么意思？Interfacial phenomena at the hetero-junction of ionic conductors are now categorized into “nanoionics” [10],in which space-charge layer models for the hetero-junction between ionic conductors are analogous to those at a semiconductor interface. The space-charge layers at the LiCoO2/electrolyte interface will be largely developed as in the Schottky junction because of the electronic conduction in LiCoO2[11], which will greatly suppress the ionic conduction at the interface. Therefore,we interposed thin buffer layers of oxides with ionic conduction and electronic insulation, i.e. oxide solid electrolytes, between the LiCoO2 and the solid electrolyte. The interposition forms two interfaces: one between the LiCoO2and the oxide solid electrolyte, and the other between the oxide and the sulfide electrolyte. The space-charge layers will not be largely developed at both interfaces, because the former interface is between two oxides, between which the electrochemical potential of lithium ions will not be largely different. The latter consists of electronic insulators, where the space-charge layer will be less developed as atp–njunctions between semiconductors[11]. Therefore, we used Li4Ti5O12as the buffer layer material in our first study [5] |
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2013-11-12 13:58:31, 230.81 K
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