Fabrication and Characterization of Solid State Batteries

全固态电池以其不漏液、重量轻、体积小等优点而备受关注，本论文以开发性能可靠的全固态电池为目的，制备了新型非晶态正极材料和室温下具有高离子电导率的新型固态电解质。（1）为了开发薄膜形式的固体离子器件的固体电解质，采用射频磁控溅射法制备了Li_2 O-SiO_2和Li_2 O-B_2 O_3-SiO_2系统的非晶薄膜，并研究了其电学性能。这些薄膜在室温下表现出10 μ <-4>~ 10 μ <-7>Sm ~（3<-1>+）的高电导率。(2)在CuI-Cu_2 O-MoO_3和CuI-CuBr-Cu_2MoO_4系统中得到了新的Cu^+离子导电玻璃。这些玻璃在室温下表现出高的离子电导率，在10 ^O至10^<-1>Sm^<-1>。这些高离子电导率与液体电解质的离子电导率相当。(3)采用快速淬火法制备了含有过渡金属氧化物的钒氧化物玻璃。以该玻璃为阴极的锂电池具有较高的能量密度和良好的可充性。这些玻璃的阴极性能比相应晶体的阴极性能好上级。

All solid-state batteries have attracted much attention for their advantages; no-leakage of liquid electrolytes, light weight, compact size, and so on. In the present study, new amorphous cathode materials and new solid state electrolytes with high ion-conductivities at room temperature were prepared and characterized with the purpose of developing the powerful and reliable solid state batteries. The following results were obtained through the present study:(1) Amorphous thin film in the systems Li_2O-SiO_2 and Li_2O-B_2O_3-SiO_2 were prepared by rf-magnetron sputtering, and their electrical properties were investigated in order to develop solid electrolytes for the solid state ionic devices in the film form. These films exhibited high electrical conductivities ranging from 10^<-4> to 10^<-7> Sm^<-1> at room temperature.(2) New Cu^+ ion-conducting glasses were obtained in the systems CuI-Cu_2O-MoO_3 and CuI-CuBr-Cu_2MoO_4. These glasses showed high ion-conductivities in the range from 10^O to 10^<-1> Sm^<-1> at room temperature. These high ion-conductivities are comparable to that of liquid electrolytes.(3) Vanadium oxide glasses containing some transition metal oxides were obtained by rapidly quenching. The lithium cells with these glasses as cathode exhibited high energy density and good rechageability. The cathode behavior of these glasses are superior to that of the corresponding crystals.