Funny after non flammable solid state lithium cells are coming to market we now learn non flammable (electrolyte) nimh cells energy density can easily be doubled
If GM never sold Ovonics to Chevron/Texaco we would have had these cells 10 years ago. Ovonics was sold to the Germans a couple of years ago for pennies on the dollar as the patents were starting to expire. Remember nimh don't need any fancy heating and cooling systems either and the cells don't need to be spaced for safety.
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But scientists at BASF are exploring the possibilities of an older type of battery, nickel-metal hydride, now used in hybrids. They recently doubled the amount of energy that these batteries can store, making them comparable to lithium-ion batteries. And they have a plan to improve them far more, potentially increasing energy storage by an additional eight times.+
The BASF researchers are aiming for batteries that cost $146 per kilowatt-hour, roughly half as much as the cheapest lithium-ion electric car batteries.+
Lithium-ion batteries have been preferred in many applications because they’re lighter and more compact—that’s why they’ve superseded nickel-metal hydride batteries in most portable electronics.+
But nickel-metal hydride batteries have some significant advantages in cars, which is why they’ve been used in hybrids for decades. They’re durable, and inherently safer than lithium-ion batteries, partly because they don’t use flammable liquids, as lithium-ion batteries do—they don’t catch fire if they overheat or are overcharged so their cooling systems and electronic controls are far simpler. Safety systems can add about 25 percent to the cost of a lithium-ion battery pack, and increase their weight by 50 percent, based on data from the industry group U.S. Advanced Battery Consortium.+
To these inherent advantages, the BASF scientists added improvements to the nickel-based materials used in the batteries. Changing the microstructure helped make them more durable, which in turn allowed changes to the cell design that saved considerable weight, enabling storage of 140 watt-hours per kilogram.+
Lithium-ion battery cells can store far more—230 watt-hours per kilogram in some cases. But when you factor in the added weight of the safety systems, and the fact that much of the energy is held in reserve to reduce wear and tear and allow for energy storage capacity fade over time, that advantage can disappear.+
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German chemical company BASF has acquired Ovonic Battery Co., a wholly owned subsidiary of EV battery maker Energy Conversion Devices Inc.
Energy Conversion Devices, of suburban Detroit, today filed for Chapter 11 bankruptcy protection. The company sold Ovonic for $58 million in cash in a transaction that closed Monday.
The late Robert Stempel, a former CEO of General Motors, served as chairman of ECD for 12 years before leaving the firm in 2007.
Ovonic, a developer of nickel-metal hydride battery technology, has its headquarters and a battery materials research center in suburban Detroit.
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DETROIT, Mich., October 10 Texaco (NYSE: TX) and General Motors (NYSE: GM) today announced Texaco's intent to acquire GM's share of a joint venture that has developed an advanced battery technology for the automotive market.
Under the terms of the memorandum of understanding, Texaco will acquire GM's 60 percent share of an existing joint venture with Energy Conversion Devices - ECD - (NASDAQ: ENER), a firm in which Texaco already holds a 20 percent interest. GM and Ovonic Battery Company, a subsidiary of ECD, formed the joint venture, GM Ovonic, in 1994 to manufacture and commercialize high-efficiency, nickel metal hydride (NiMH) automobile batteries. The joint venture, which will be re-named Texaco Ovonic, plans to fully commercialize and expand its applications to a broad range of energy markets.
"ECD and Ovonic developed breakthrough advanced NiMH battery technology and General Motors has brought it to the production stage," said Texaco Senior Vice President William M. Wicker. "With the demand for all-electric and hybrid vehicles projected to grow significantly over the next few years, the time is right to extend this technology to the entire automotive market and take it to the next level of commercial development
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