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Technology Stocks : VALENCE TECHNOLOGY (VLNC)

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To: Gordon Quickstad who wrote (174)	4/4/1997 12:24:00 PM
From: Gordon Quickstad	of 27311

The 3/31/97 issue of EE Times had a battery article on page 1. I got the issue on Wed. (4/2/97). It described a week ago "Portable by Design" conference in Santa Clara. Some points in the article: Nearly all new notebook computers in 1997 will use lithium systems vs. NiCd and Ni-Metal Hydride. For safety and battery life of lithium ion chemistry, battery management electronics is essential, and there are several approaches in competition for this management. The safety issue is due to metalic slivers of lithium that can grow and short out the cell. I believe this isn't a problem for the polymer (solid) electrolyte of the Valence battery. Battery Technologies is marketing a rechargable alkaline battery they call RAM. It gives hundreds of cycles and is designed to replace conventional alkaline batteries in consumer applications. AER Energy Resources has a zinc-air battery. It requires a fan to supply atmospheric oxygen to consume when in use. During recharge it generates oxygen (not exactly a safety feature in my mind because it makes the vicinity more combustable). The battery must be isolated from oxygen during periods of non-use. Zinc-air batteries go to half capacity by the 50th deep discharge. The battery in practice would have to be replaced every couple of months, but is safely disposable. The Powerdex division of Gould Electronics is developing a lithium polymer battery that essentially gives the same performance of liquid electrolyte lithium -ion batteries. Battery Engineering Inc. has devised a Li-ion cell with carbon anode and cathode and a sulfur dioxide electrolyte. A sacrificial metallic lithium electrode disperses into the carbon during the first cycles. The sulphur dioxide/lithium chemistry is chemically resistant to overcharging. The carbon fixes the growth of lithium slivers and avoids the explosion problem. Gordon

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