Search

Energy-differential cross sections of fragment (heavier than a-particle) production of carbon and aluminum were obtained with a specially designed Bragg curve spectrometer (BCS) and energy-time-of-flight method (E-TOF) for 70 MeV protons at 30-degree laboratory angle. The consistency of these two methods was confirmed by comparing Z=2 results each other. The energy differential cross sections of fragments for Z=3 and m=6, 7 are obtained by BCS and E-TOF, respectively. These results are compared with other experimental data, LA-150 evaluated nuclear data and QMD calculation results. The disagreements between present data and both results of evaluation and calculation show systematic trends.

Recently, considerable attention has been paid to the investigations of solid-state lithium-ion rechargeable batteries for widespread application in many types of portable electronic devices. Previously, the multi-layered Li-ion batteries were reported. In the present paper, investigated were the composite-type Li-ion rechargeable batteries stacked with an Si solar cell for higher performance of the thin-filmed battery. Thin films of LiMn2O4 positive electrode, Li3PO(4-x)N(x) solid electrolyte and V2O5 negative electrode were successively prepared onto an amorphous Si solar cell on a glass substrate by an rf-magnetron sputtering method with a typical rf power of 100 W under an Ar-gas, Ar/N2 and Ar/O2 mixture-gas pressure of 10 mTorr, respectively. The five Si solar cells which have a cell voltage of 0.65 V under illumination were connected in-series in order to charge effectively the Li-ion cell of a cell voltage of approximately 3 V. The areas of the three types of unit solar cells are 5 x 5 sq mm, 7 x 7 sq mm, and 10 x 10 sq mm, respectively. On the other hand, the effective operation area of Li-ion cells is 3.9 sq cm or 2.8 sq cm. The composite-type battery showed typically the discharge capacity of 10 to 15 micro-Ah/sq cm with an efficiency of approximately 100 percent. A maintenance-free operation of this battery could also be confirmed by moving it under the constant sink current of 5 micro-A in the laboratory room through day and night. In conclusion, a new thin-filmed battery could successfully be constructed by the Li-ion rechargeable cell being stacked on the Si solar cell. This type of battery has several advantages of light weight, high reliability and flexibility for the cell shape, almost all of which result from the thin-filmed and all-solid-state battery. Furthermore, the composite-type Li-ion-battery can be used as a maintenance-free battery by direct recharge from the Si solar cell in spite of power supply from AC 100 V. The present battery may be expected for the potential use in small-sized medical instruments and in space satellites/stations which need the light weight and high reliability mentioned above., 資料番号: AA0047275004

International audience

International Conference on Nuclear Data for Science and Technology