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Technology Stocks : VALENCE TECHNOLOGY (VLNC)

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To: FMK who wrote (3948)	8/25/1998 8:44:00 PM
From: Tmoore	Read Replies (2) of 27311

Fred, here is a little more information regarding the Yuasa tiny battery. Yuasa Reveals Details of Li-Polymer Battery for Audio Device August 21, 1998 (TOKYO) -- Yuasa Corp. revealed details of its lithium (Li)-polymer secondary battery that was selected for a card-sized audio device tentatively called "SolidAudio" and developed jointly by Nippon Telegraph and Telephone Corp. (NTT) and Kobe Steel Ltd. SolidAudio is a mobile player that enables music data downloaded from the Internet to be played back. Initially, the developers had planned to adopt a lithium-ion secondary battery, but they could not resolve issues related to the target size of less than 10mm in thickness. For this reason, they switched to the Li-polymer secondary battery. The specifications of the Li-polymer secondary battery are as follows: the external dimensions are 51mm wide by 75mm long by 1.5mm thick; the average operating voltage is +3.5 V; and the current capacity is 175 mAh. At this current capacity the SolidAudio device will operate for about three hours. The energy density in volume is 109 Wh/l and in mass it is 70 Wh/kg, according to the developers. The positive electrode is made of LiCoO2 and the negative one of coke-graphite. The electrolyte is a gel that is made from a mixture of an organic solvent and a solid of random copolymerization between polyethylene oxide and polypropylene oxide. A protective circuit is embedded in the charger to avoid over-charging or over-discharging. Because the electrolyte is a gel, there is no chance of a dangerous leak of liquid and no need to install a safety valve, which must be included in the case of an ordinary battery pack. The battery pack is very light at 9 grams. I can hardly wait to see all the new products this technology unleashes once designers get involved. Great things are about to happen with this technology despite what the market is saying about VLNC et al. Tmoore

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