Intefacial Observation between LiCoO2 Electrode and Li2S-P2S5 Solid Electrolytes of All-Solid-State Lithium Secondary Batteries Using Transmission Electron Microscopy
Intefacial Observation between LiCoO2 Electrode and Li2S-P2S5 Solid Electrolytes of All-Solid-State Lithium Secondary Batteries Using Transmission Electron Microscopy
复制标题
DOI：
10.1021/cm901819c
复制
发表时间：
2010-02-09
影响因子：
8.6
通讯作者：
Tatsumisago, Masahiro
中科院分区：
文献类型：
--
作者：
Sakuda, Atsushi;Hayashi, Akitoshi;Tatsumisago, Masahiro
在全固态锂二次电池中，电极和电解质材料都是固态的。电极与固体电解质界面的结构和形态影响电池的电化学性能。利用透射电镜观察LiCoO2正极与高锂离子导电率Li2S-P2S5固体电解质之间的界面。电池初次充电后，在LiCoO2电极与Li2S-P2S5固体电解质的界面处形成界面层。此外，还观察到Co、P、S在LiCoO2与Li2S-P2S5界面的相互扩散。用Li2SiO3薄膜包裹LiCoO2粒子抑制了相互扩散和界面层的形成。结果表明，包覆li2sio3的全固态电池的电化学性能优于未包覆li2sio2的全固态电池。全固态电池在-30℃下工作，使用lisio3涂层的LiCoO2全固态电池在100℃下以40 mA cm（-2）的高电流密度充放电。
In all-solid-state lithium secondary batteries, both the electrode and electrolyte materials are solid. The electrode and solid electrolyte interface's structure and morphology affect a battery's electrochemical performance. Observation of the interface between LiCoO2 positive electrode and highly lithium-ion-conducting Li2S-P2S5 solid electrolyte was conducted using transmission electron microscopy. An interfacial layer was formed at the interface between LiCoO2 electrode and Li2S-P2S5 solid electrolyte after the battery's initial charge. Furthermore, mutual diffusion of Co, P, and S at the interface between LiCoO2 and Li2S-P2S5 were observed. The mutual diffusion and the formation of the interfacial layer were suppressed using LiCoO2 particles coated with Li2SiO3 thin film. Results showed that all-solid-state Cells using Li2SiO3-coated LiCoO2 had better electrochemical performance than those using noncoated LiCoO2. The all-solid-state cells functioned at -30 degrees C. Moreover, the all-solid-state cell using LiSiO3-coated LiCoO2 was charged and discharged under a high current density of 40 mA cm(-2) at 100 degrees C.