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The Basement
Batteries May Become Obsolete
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<blockquote data-quote="Per Søvik" data-source="post: 82005" data-attributes="member: 1285"><p>Re: Batteries May Become Obsolete</p><p></p><p>High density batteries will allways be a bit of a risk, just like explosives and a couple of rocket fuels, all the ingredients for a massive release of energy is present within the package. Fuels are generally quite safe because only part of the compounds needed for combustion is present. The fuel tank of a car typically contains between 1 and 2 GJ of potential energy release. Due to the low efficiency of a combustion engine, a lot less energy is required from a battery package, and assuming we need some energy to heat the car etc, a quarter of the energy seems reasonable, so we need capacities between 250 and 500 MJ to get the same full tank range. That is the equivalent of 50-100 kg of TNT, in other words not the kind of uncontrolled instantanious energy release you want to happen.</p><p></p><p>While I honestly think that the safety issues will be overcome and batteries will become reliable, I also imagine that low cost batteries will cause a few serious accidents and deaths even when the technology exists to make safe superdensity batteries.</p><p></p><p>If graphene really is the holy grail, and batteries and solar cells are revolutionized, it will definitely be the last nail in the coffin for the solar cell segment of the the silicon wafer industry, but it might be the catalyst of a bright future for a energy hungry world.</p><p></p><p>Incidentally, the energy market might be an area where free market is doing more harm than good because the more freedom and better worldwide distribution you get, the higher is the demand, something that jacks up the prices and hurts both industry and households and only benefits those who profits from the energy market.</p><p></p><p>PS: One of the best ways of storing energy is to pump water up to a high reservoir and use a turbine to produce electricity from that reservoir. At our local power plant, a variation on that theme was just finalized. Our main reservoir is at 1000m, but some of the catchment area supplies a reservoir at 900m. To utilize the energy of the water in the lower reservoir, the water is pumped to the 1000m reservoir, both storing energy (the 100m elevation) and getting a ten fold return on the stored energy (the 1000m drop)</p></blockquote><p></p>
[QUOTE="Per Søvik, post: 82005, member: 1285"] Re: Batteries May Become Obsolete High density batteries will allways be a bit of a risk, just like explosives and a couple of rocket fuels, all the ingredients for a massive release of energy is present within the package. Fuels are generally quite safe because only part of the compounds needed for combustion is present. The fuel tank of a car typically contains between 1 and 2 GJ of potential energy release. Due to the low efficiency of a combustion engine, a lot less energy is required from a battery package, and assuming we need some energy to heat the car etc, a quarter of the energy seems reasonable, so we need capacities between 250 and 500 MJ to get the same full tank range. That is the equivalent of 50-100 kg of TNT, in other words not the kind of uncontrolled instantanious energy release you want to happen. While I honestly think that the safety issues will be overcome and batteries will become reliable, I also imagine that low cost batteries will cause a few serious accidents and deaths even when the technology exists to make safe superdensity batteries. If graphene really is the holy grail, and batteries and solar cells are revolutionized, it will definitely be the last nail in the coffin for the solar cell segment of the the silicon wafer industry, but it might be the catalyst of a bright future for a energy hungry world. Incidentally, the energy market might be an area where free market is doing more harm than good because the more freedom and better worldwide distribution you get, the higher is the demand, something that jacks up the prices and hurts both industry and households and only benefits those who profits from the energy market. PS: One of the best ways of storing energy is to pump water up to a high reservoir and use a turbine to produce electricity from that reservoir. At our local power plant, a variation on that theme was just finalized. Our main reservoir is at 1000m, but some of the catchment area supplies a reservoir at 900m. To utilize the energy of the water in the lower reservoir, the water is pumped to the 1000m reservoir, both storing energy (the 100m elevation) and getting a ten fold return on the stored energy (the 1000m drop) [/QUOTE]
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