As­phalt-based su­per bat­ter­ies

HWM (Singapore) - - CONTENTS - By James Lu

The next big break­through in bat­tery tech­nol­ogy could be right un­der your feet

A team at Rice Univer­sity’s Tour lab has de­vel­oped a new por­ous car­bon anode made from as­phalt that could po­ten­tially charge high-ca­pac­ity lithium bat­ter­ies 20 times faster than cur­rently avail­able com­mer­cial lithi­u­mion bat­ter­ies.

Project lead, James Tour, said “the ca­pac­ity of these bat­ter­ies is enor­mous, but what is equally re­mark­able is that we can bring them from zero charge to full charge in ve min­utes, rather than the typ­i­cal two hours or more needed with other bat­ter­ies.”

The re­searchers mixed as­phalt with con­duc­tive graphene nanorib­bons and coated the com­pos­ite with lithium metal through elec­tro­chem­i­cal de­po­si­tion to cre­ate the new ma­te­rial. The anode was then com­bined with a sul­fu­r­ized-car­bon cath­ode to make full bat­ter­ies for test­ing. The bat­ter­ies showed a high-power den­sity of 1,322 watts per kilo­gram and high-en­ergy den­sity of 943 watt-hours per kilo­gram.

Test­ing re­vealed an­other sig­nif­i­cant ben­e­fit: The car­bon anode mit­i­gated the for­ma­tion of lithium den­drites. These un­wanted den­drites usu­ally form in stan­dard lithium bat­ter­ies and in­vade a bat­tery’s elec­trolyte. If they ex­tend far enough, they short-cir­cuit the anode and cath­ode and can cause the bat­tery to fail, catch re or ex­plode.

100% 0%

Newspapers in English

Newspapers from Singapore

© PressReader. All rights reserved.