Advantages 95 High theoretical specific capacity Li22Sis-4200 mAh/g Low discharge potential plateau 0.4 V versus Lit/Li-high working voltage,leading to high energy density in a full LIB Environmentally friendly ·Low toxicity High abundance (the 2nd most abundant element in the earth's crust) 6
6 Advantages • High theoretical specific capacity Li22Si5—— 4200 mAh/g • Low discharge potential plateau ≈ 0.4 V versus Li+ /Li —— high working voltage, leading to high energy density in a full LIB • Environmentally friendly • Low toxicity • High abundance (the 2 nd most abundant element in the earth’s crust)
Problems /96 a:Pulverization d:Initial CE 500.000 20 oO w100 00O 400.000 80 o 300.000 60 200.000 40 E 20 a=25 nm 100.000 d=80 nm 0T斤 -0 012345678910 b:Unstable SEl Pomegranate diameter (um) e:Areal capacity Charge Li Discharge Si Cathode Anode Lithium alloy Silicon c:Electrode failure f:Materials cost Problems and challenges of silicon-based anode for lithium-ion battery. Advanced Energy Materials,2017,7(23):1700715. 7
7 Problems Problems and challenges of silicon-based anode for lithium-ion battery. Advanced Energy Materials, 2017, 7(23): 1700715