Stacked-graphene layers as engineered solid-electrolyte interphase (SEI) grown by chemical vapour deposition for lithium-ion batteries

摘要: Abstract A multi-layer of stacked-graphene (8 layers basal planes) grown by chemical vapour deposition (CVD) is introduced as an artificial solid electrolyte interphase (SEI) layer onto a transition metal oxide cathode for lithium-ion batteries. The planes are generally regarded strong physical barrier that prevents diffusion, although it believed small number lithium-ions can migrate through the defect sites stacked layers. Interestingly, unique design perpendicular to not only effectively suppresses formation instable SEI layers, but also achieves reasonable amount battery charge capacities. To correctly understand impact from design, we further studied rate kinetics difference between slow cycles (0.125 C→0.250 C→0.400 C→0.125 C) and rapid (C→2 C→3 C→C). We propose clap-net like could enable effective conducting pathway electron transport, while protecting active material inside. magnetic measurements reveal efficient Li+ (de)intercalation into graphene-layers. renders electrode/electrolyte interface more stable against dynamic changes. present approach provides particular advantage in developing high stability be utilized at various rates.