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YongJian, W. U., et al. Journal of Alloys and Compounds 830 (2020): 154575.
Graphene conductive slurries for lithium-ion battery anodes were prepared using methods such as mechanical stirring, ultrasonic dispersion, and modification with different dispersing agents, including polyvinylpyrrolidone, sodium lignosulfonate, and carboxymethyl cellulose (CMC). When graphene slurry is used as the conductive agent in lithium-ion batteries, these dispersing agents can prevent graphene aggregation and help establish a conductive network. The SiOx/graphene-CMC electrode exhibits excellent electrochemical performance, with first-cycle charge and discharge capacities of 1273.8/1723.7 mAh/g and a Coulombic efficiency of 73.9% at a constant current of 100 mA/g.
Preparation of SiOx/Graphene for Lithium-Ion Battery Using Graphene Slurry: Mix 2g of SiOx powder with 12.5mL of graphene slurry and stir vigorously for 120 minutes. Then, continuously add 0.625g of binder (SBR, 40% mass fraction) and stir for 30 minutes. The mixture is then coated onto copper foil to form the anode electrode. The electrode is dried in a vacuum at 80°C for 12 hours. The material mass ratio of the electrode is SiOx: Graphene: Dispersant: Binder in a ratio of 80:5:5:10. Pure lithium foil is used as the counter electrode, and Celgard 2500 film is used as the separator. The electrolyte is 1 mol/LLiPF6/ethylene carbonate:dimethyl carbonate = 1:1 (v/v). The CR2032 lithium battery is assembled in an argon glove box. Batteries prepared using different graphene conductive slurries are labeled as B-PVP, B-SLS, B-CMC, and B-GR. The comparison battery sample, prepared with 10% acetylene black, 80% SiOx, and 10% SBR binder, is labeled as B-10%C.
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