Actually, the end of the sentence says power density, so I think that they are using the correct metric after all, only their quote is completely opposite to Nature's, so the first question still stands. Who to trust.
Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Cor van de Water via EV Sent: Tuesday, April 07, 2015 3:36 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] Aluminum battery from Stanford Who do you trust - Nature or this gatget article that has no clue that electricity is not stored in Watts but in Watt hours... Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Bill Dennis via EV Sent: Tuesday, April 07, 2015 3:34 PM To: 'Electric Vehicle Discussion List' Subject: Re: [EVDL] Aluminum battery from Stanford Here's the URL to the article I quoted, plus the paragraph from the article itself: http://www.engadget.com/2015/04/06/stanfords-battery-charges-in-one-minute/ " Unlike earlier aluminum batteries, which generally failed after only about 100 recharge cycles, Stanford's prototype can cycle more than 7,500 times without any capacity loss -- 7.5 times longer than your average li-ion. The aluminum-ion cell isn't perfect (yet) as it can only produce about 2 volts, far less than the 3.6V that lithium-ion an muster. Plus aluminum cells only carry 40 watts of electricity per kilogram compared to lithium's 100 to 206 W/kg power density." Bill -----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Cor van de Water via EV Sent: Tuesday, April 7, 2015 4:29 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] Aluminum battery from Stanford Actually, the Nature article quotes 4 Amp per gram, so if a 2V cell weighs 1kg then it could produce 4,000A or 8kW per kg The Capacity is quoted as 70mAh per gram, which is 140 Wh per kg (again, at the expected 2V cell voltage). Note that all these numbers are the bare cell, so to compare with a CALB 180Ah cell you'd either need to subtract the CALB's housing and connection hardware weight, or estimate how much it would add to the Alu battery to make a similar rugged and packaged end product. By all accounts, it looks like very competitive to Li cells, but all research takes many years before you can place an order for commercial available product... If it is really cheaper, better, safer, then we can see it break through sooner. Time will tell. Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Bill Dennis via EV Sent: Tuesday, April 07, 2015 2:59 PM To: 'Electric Vehicle Discussion List' Subject: Re: [EVDL] Aluminum battery from Stanford Their current version of the battery has only 40 watts of electricity per kilogram compared to lithium's 100 to 206 W/kg power density--so you'd need more of them to get the same power. That might get better as they improve the cells, of course. Bill -----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Ben Goren via EV Sent: Tuesday, April 7, 2015 2:11 PM To: Electric Vehicle Discussion List Subject: [EVDL] Aluminum battery from Stanford offers safe alternative to conventional batteries Does anybody know any more about this research? http://news.stanford.edu/news/2015/march/aluminum-ion-battery-033115.html Aluminum anode; graphite cathode. Unspecified salt for the electrolyte. It's only about two volts. The rest of the specs are vague...nothing at all about capacity. They claim super-fast charging times without indicating how much energy the batteries actually take on. They claim several thousand charge cycles. No mention of energy density per mass. The prototype is bendable, in what looks for all the world like a mylar ziploc bag. They show the battery being drilled into with minimal ill effect. I find it intriguing to consider for an electric vehicle...because a super-fast charging time, if real, would similarly imply a super-fast discharge rate. It gives the appearance of being technology within the reach of an hobbyist to manufacture. Form factor is obviously quite literally flexible. In other words...I can almost imagine building a battery like this, myself, at home, to put into a car conversion. Or, if it's too heavy for vehicles, then to stick in the closet to pair with the solar PV array. Any experts out there have any good water to throw over me? b& _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
