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全固態(tài)鋰電池中電極/電解質(zhì)界面處的空間電荷層
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全固態(tài)鋰電池中用過渡金屬氧化物做正極,硫化物做為電解質(zhì)時(shí),由于Li+在兩種材料中的電化學(xué)勢(shì)不同,會(huì)出現(xiàn)類似于電子導(dǎo)體中的pn結(jié),即Li+在電解質(zhì)/電極界面分布隨空間發(fā)生變化,形成空間電荷層,空間電荷層導(dǎo)致高界面電阻?這是文獻(xiàn)中說的原因,有沒有高手說一說這是什么意思?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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