Dual Carbonaceous Materials Synergetic Protection Silicon as a High-Performance Free-Standing Anode for Lithium-Ion Battery

Abstract

Silicon is the one of the most promising anode material alternatives for next-generation lithium-ion batteries. However, the low electronic conductivity, unstable formation of solid electrolyte interphase, and the extremely high volume expansion (up to 300%) which results in pulverization of Si and rapid fading of its capacity have been identified as primary reasons for hindering its application. In this work, we put forward to introduce dual carbonaceous materials synergetic protection to overcome the drawbacks of the silicon anode. The silicon nanoparticle was coated by pyrolysed carbon, and meanwhile anchored on the surface of reduced graphene oxide, to form a self-standing film composite (C@Si/rGO). The C@Si/rGO film electrode displays high flexibility and an ordered porous structure, which could not only buffer the Si nanoparticle expansion during lithiation/delithiation processes, but also provides the channels for fast electron transfer and lithium ion transport. Therefore, the self-standing C@Si/rGO film electrode shows a high reversible capacity of 1002 mAh g−1 over 100 cycles and exhibits much better rate capability, validating it as a promising anode for constructing high performance lithium-ion batteries.

Enhanced Capacity and Cycle Stability of a Pomegranate-Like Si/rGO Composite Anode by Electrostatic Self-Assembly and Spray-Drying Processes

“…The value of σ can be obtained as a slope from the fitting curves for Z ′ and ω –0.5 of Si and the ES-Si/rGO composite (Figure b). The calculation obeys the following relationship: The Li + diffusion coefficients of ES-Si/rGO, S-Si/rGO, and E-Si/rGO calculated by eq are 3.85 × 10 –15 , 2.66 × 10 –15 , and 1.57 × 10 –15 cm 2 s –1 , respectively (Table ). The higher Li + diffusion coefficient of ES-Si/rGO indicates that it has a faster mass transfer rate, laying the foundation for its good performance. , …”

High Electrochemical Performance Silicon Thin-Film Free-Standing Electrodes Based on Buckypaper for Flexible Lithium-Ion Batteries

“…The anodic and the cathodic voltage curves of the HBP shifted slightly toward the negative and positive directions, implying changes in the electronic resistance [ 20 , 21 ]. The CV curves of the USi_HBP and HSi_HBP show that both the heat-treated electrodes exhibited typical redox features of Si with lithium insertion occurring at potentials below 0.3 V and extraction of lithium ions from Li-Si alloys at 0.36 and 0.53 V ( Figure 6 c,d, respectively) [ 40 , 41 , 42 , 43 , 44 , 45 , 46 ]. For both electrodes, broad cathodic peaks appeared at 0.61 and 1.2 V in the first cycle but disappeared in the following cycles, indicating an irreversible reaction due to the formation of an SEI layer [ 5 , 41 ].…”

Sea Urchin-like Si@MnO2@rGO as Anodes for High-Performance Lithium-Ion Batteries

“…Furthermore, when the current density rose again to 0.1 A g −1 , the specific charging capacity recovered to 981.68 mAh g −1 and the capacity retention rate was 74.2%. Compared to previous reports of Si and Si@rGO, Si@MnO 2 @rGO-50 • C demonstrated a long lifetime and high capacity retention rates [46,47]. Furthermore, to evaluate the cycling stability at high current densities, Si@MnO 2 @rGO-50 • C was tested at 1 Ah g −1 (Figure 5e).…”