29 Jan '18, 9am

WMG researchers use graphene girders to improve performance of Si anodes in Li-ion batteries #BelugaSolar

WMG researchers use graphene girders to improve performance of Si anodes in Li-ion batteries #BelugaSolar

Silicon is also not intrinsically elastic enough to cope with the strain of lithiation when it is repeatedly charged, leading to cracking, pulverization and rapid physical degradation of the anode’s composite microstructure. This contributes significantly to capacity fade, along with degradation events that occur on the counter electrode—the cathode. Numerous approaches have attempted to overcome these issues, including the use of nano-sized / structured silicon particles with micron-sized graphene. This, however, has not proved satisfactory. Using nano-sized silicon particles significantly increases the amount of reactive surface available, which leads to much more lithium being deposited on the silicon during the first charge cycle forming a solid-electrolyte interphase barrier between the silicon and the electrolyte and thus greatly reducing the lithium inventory and th...

Full article: http://www.greencarcongress.com/2018/01/20180129-wmg.html

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