Date: Thu, 11 Apr 2002 16:16:10 +0100 From: T i m <[EMAIL PROTECTED]> Subject: Re: [LIB] [Lib] Battery technology advances
Hi Nick, "Lines, Nick" wrote: > Date: Thu, 11 Apr 2002 10:29:40 -0400 > From: "Lines, Nick" <[EMAIL PROTECTED]> > Subject: [Lib] Battery technology advances > > OK, I've searched the archives, unscribbled, scribbled, checked the > miniskirt and looked at the furry light bulb until my eyes hurt, but... > > There have been advances in technology since the 'umble yet puissant L50 > came on the market. > > Has anyone successfully investigated replacing the cells of the standard > battery with something with an equivalent voltage, similar internal > resistance and charging voltage that has a larger capacity (mAh rating)? [T] I'd like to know the answer to that one but in the meantime, this might help explain the current technology .. A lithium ion battery is assembled in the fully discharged state with carbon serving as the anode and LiCoO2 serving as the cathode. When you charge the cell, Li is extracted from the LiCoO2 cathode...become ionic Li+....and then travels to the anode where it is inserted between carbon layers. Thus, when you try to figure out the amount of lithium in a lithium ion battery, it is not in the traditional sense (the old lithium rechargeable batteries actually used lithium metal as the anode rather than carbon). This being said, the weight of lithium contained in lithium cobalt oxide is ~ 7%. Once the total weight of the cathode is calculated (binder and conductive diluent added) the lithium content comes out to be ~ 6 %. Once the other components in the cell are added to the cathode weight (including anode, separator, substrate, can, seal, etc.), my guess is that the lithium content will come out to be 3 to 4% of the total weight depending on cell design (again...this is not free lithium metal). In addition, one can add the amount of lithium present in the electrolyte salt (i.e., LiPF6), however, in solution this will be only present in the ionic state (if added...it might amount to a percent or two higher to the initial estimate). > > > My small yet inquisitive brain thinks that this must be possible. But does > anyone know of the necessary parameters and suppliers of such beasts? > > Ta, > > Nick. [T] It was from memory but I hope that helps? T i m ;-) ************************************************************** http://libretto.basiclink.com - Libretto mailing list http://www.silverace.com/libretto/ - Archives -------TO UNSUBSCRIBE------- Reply to any of the list messages. The reply mail should be addressed to: [EMAIL PROTECTED] - Then replace any text on the message's subject line: cmd:unsubscribe --------TO UNSUBSCRIBE DIGEST------ Do above but with this on subject line: cmd:unsubscribe digest **************************************************************
