| This paper briefly describes the development of solid battery and electrode materials and electrolytes associated. As the conventional liquid lithium-ion batteries adopt organic liquid electrolyte, there are a lot of potential safety hazards, like leak, fire, etc.Now we try to replace the liquid electrolyte with solid-state electrolyte to study solid-state batteries, and this has certain significance for solving security problems in conventional batteries. In addition, compared with the liquid batteries, the solid-state battery structure is much simpler. Especially the thin-film solid-state batteries, thire thickness, size and shape can be easily controlled, so its application in microelectronics devices become more and more widely. Thus, researchers at home and abroad gradually began to study solid state battery and all-solid thin film battery, and had made some progress. In this thesis, on the one hand, we prepared the Li-Co-O thin film electrode by using the magnetron sputering method and conducted a series of experiments under different sputtering conditions. The thin film was characterized by SEM, XRD, Raman, AFM, CV, and charge-discharge test, in order to systematically study the preparation technology, structure, properties of the thin-film electrode, and optimize process parameters. On the other hand, the essay is trying to do a tentative exploration in Li/solid electrolyte/LiCoO2solid-state batteries prepared by the cold pressing, attempted to lay the foundation for further study on solid-state batteries, realizing their large scale production and application. This paper mainly centered on solid-state lithium-ion batteries, and based on it some basic research on its thin-film electrode materials, the construction of solid-state batteries were carried out.And the main progress obtained by far are as follows:The positive thin film Li-Co-O was prepared by radio-frequency magnetron sputtering, and by adjusting the technical parameters during sputtering process, a series of Li-Co-O thin film can be obtained. The as-deposited or annealed films under different sputtering parameters have notable difference in its morphology, composition, structure and properties. Through the experiment, the performance of the film after annealing has been greatly improved. And based on it, by changing the sputtering parameters, such as the sptradio frequency power (80-160W), the gas flow rate of argon and oxygen (corresponding gas pressure was:0.5-0.9Pa), argon-oxygen ratio (1:3,1:1,2:1,3:1,4:1,1:0), sputtering time (1.5h,2.0h,2.5h,3.0h,3.5h,4.0h), and fixing sputtering temperature at290℃, we can obtained the Li-Co-O thin film with relatively good performance. Its capacity exhibits a certain change at0.05C, 0.1C,0.2C,0.5C. Thus this thin-film electrode material is suitable for thin-film battery which is installed in the device with small current.Li/solid electrolyte/LiCoO2solid battery was prepared by cold pressing method, and some simple explorations were made. At first, some characterizations have been conducted for the solid electrolyte used, to study its conductivity and electrochemical stability under a certain pressure. And on this foundation, the solid-state battery structure was explored. Since problems like the structure and composition of electrode, conductivity of the electrolyte, the interface between electrode and electrolyte are still unresolved, the internal polarization of solid-state battery is large, resulting in the relatively poor performance of the solid-state battery. Therefore it needs to be further optimized.There is no risk of leakage and inflammation in this kind of battery, the safety performance is greatly improved, so it is the trend for the development of the lithium ion battery in the future. |
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