Yoshio Uetani

Preparation of iron sulfides and the study of their electrochemical characteristics for use in a nonaqueous—lithium battery

Abstract A variety of iron sulfides was prepared by changing both the mixing ratio of iron to sulfur and the reaction heating temperatures. Samples were then subjected to chemical and X-ray diffraction analyses to check their composition. These iron sulfides were polarized in a nonaqueous electrolyte. As a result, the sample prepared with a S/Fe ratio of 1.1/1 and heated at 800 °C showed the highest electrochemical capacity and had the molecular formula FeS. A button-type, nonaqueous electrolyte—lithium battery using the FeS as the cathode material was constructed and evaluated. The energy density of the battery was calculated to be 0.448 W h/cm 3 and 0.137 W h/g.

Characteristics of a lithium-thionyl chloride battery as a memory back-up power source

Abstract An Li/SOCl 2 battery of R6 size (ER6C) has been evaluated as a memory back-up power source for CMOS RAM. The working voltage is 3.6 V and the discharge capacity is 1900 mA h on a 1OK-ohm load. The cell exhibits satisfactory working voltage and discharge capacity over the temperature range −40 °C to 85 °C. The discharge reaction mechanism has been elucidated. Cumulative self discharge during 10 years discharge at 20 μA is estimated to be 3.5%. No serious problems have been observed during abuse tests.

The influence of particle size distribution of some manganese dioxide on practical zinc chloride cell performance

Abstract The influence of particle size distribution of manganese dioxide on performance of a zinc chloride cell on continuous discharge and intermittent discharge was studied, using I.C.S. No. 1 ( emd ), No. 7 ( nmd ) and No. 12 ( cmd ). The fine particle nmd showed not only better MnO 2 utilization efficiency but also better cell capacity than the course one, which was considered to be due to the different discharge mechanism of the fine particle nmd from that of the coarse particle nmd . In the case of emd , the fine particle MnO 2 showed better MnO 2 efficiency than the coarse particle one, however, the performance of the fine particle cell was not improved because the fine particle MnO 2 needed more electrolyte than coarse particle MnO 2 did and, as a result, the packing density of the fine particle emd at the maximum MnO 2 utilization efficiency was much lower than that of the coarse particle emd . The influence of particle size distribution of cmd on discharge performance was negligible.