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

Li, Xing; Bai, Yongshun; Wang, Mingshan; Wang, Guoliang; Ma, Yan; Huang, Yun; Zheng, Jianming

doi:10.3390/nano9040650

Cited by 20 publications

(15 citation statements)

References 67 publications

(89 reference statements)

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“…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. , …”

Section: Resultsmentioning

confidence: 85%

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

Yang

et al. 2022

Ind. Eng. Chem. Res.

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Si is considered one of the most promising anodes for lithium-ion batteries due to its ultrahigh theoretical capacity and abundant resource reserves. However, the poor conductivity and large volume expansion of silicon-based anode materials seriously affect their charge−discharge efficiency and cycling stability. In this study, the dispersion of Si nanoparticles and graphene oxide (GO) is atomized into small droplets, followed by electrostatic self-assembly, spray-drying, and high-temperature annealing to obtain the pomegranate-like Si/rGO composite (ES-Si/rGO) with a concentrated size of ∼2 μm. It is noteworthy that the preparation is under mild conditions and easy to scale up. As a result, ES-Si/rGO shows a high rate performance at wide current densities and maintains a reversible capacity of 969.3 mAh g −1 after 200 cycles at 500 mA g −1 . The compact rGO improves the electrical conductivity and slows down the structure deterioration. This work is of great potential toward the scalable preparation of silicon-based anodes.

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Section: Resultsmentioning

confidence: 85%

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

Yang

et al. 2022

Ind. Eng. Chem. Res.

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“…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 ].…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2021

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Recently, applications for lithium-ion batteries (LIBs) have expanded to include electric vehicles and electric energy storage systems, extending beyond power sources for portable electronic devices. The power sources of these flexible electronic devices require the creation of thin, light, and flexible power supply devices such as flexile electrolytes/insulators, electrode materials, current collectors, and batteries that play an important role in packaging. Demand will require the progress of modern electrode materials with high capacity, rate capability, cycle stability, electrical conductivity, and mechanical flexibility for the time to come. The integration of high electrical conductivity and flexible buckypaper (oxidized Multi-walled carbon nanotubes (MWCNTs) film) and high theoretical capacity silicon materials are effective for obtaining superior high-energy-density and flexible electrode materials. Therefore, this study focuses on improving the high-capacity, capability-cycling stability of the thin-film Si buckypaper free-standing electrodes for lightweight and flexible energy-supply devices. First, buckypaper (oxidized MWCNTs) was prepared by assembling a free stand-alone electrode, and electrical conductivity tests confirmed that the buckypaper has sufficient electrical conductivity (10−4(S m−1) in LIBs) to operate simultaneously with a current collector. Subsequently, silicon was deposited on the buckypaper via magnetron sputtering. Next, the thin-film Si buckypaper freestanding electrodes were heat-treated at 600 °C in a vacuum, which improved their electrochemical performance significantly. Electrochemical results demonstrated that the electrode capacity can be increased by 27/26 and 95/93 μAh in unheated and heated buckypaper current collectors, respectively. The measured discharge/charge capacities of the USi_HBP electrode were 108/106 μAh after 100 cycles, corresponding to a Coulombic efficiency of 98.1%, whereas the HSi_HBP electrode indicated a discharge/charge capacity of 193/192 μAh at the 100th cycle, corresponding to a capacity retention of 99.5%. In particular, the HSi_HBP electrode can decrease the capacity by less than 1.5% compared with the value of the first cycle after 100 cycles, demonstrating excellent electrochemical stability.

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“…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).…”

Section: Lithium-ion Battery Performancementioning

confidence: 89%

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

Liu

Wang

et al. 2022

Nanomaterials

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Si is a promising material for applications as a high-capacity anode material of lithium-ion batteries. However, volume expansion, poor electrical conductivity, and a short cycle life during the charging/discharging process limit the commercial use. In this paper, new ternary composites of sea urchin-like Si@MnO2@reduced graphene oxide (rGO) prepared by a simple, low-cost chemical method are presented. These can effectively reduce the volume change of Si, extend the cycle life, and increase the lithium-ion battery capacity due to the dual protection of MnO2 and rGO. The sea urchin-like Si@MnO2@rGO anode shows a discharge specific capacity of 1282.72 mAh g−1 under a test current of 1 A g−1 after 1000 cycles and excellent chemical performance at different current densities. Moreover, the volume expansion of sea urchin-like Si@MnO2@rGO anode material is ~50% after 150 cycles, which is much less than the volume expansion of Si (300%). This anode material is economical and environmentally friendly and this work made efforts to develop efficient methods to store clean energy and achieve carbon neutrality.

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

Cited by 20 publications

References 67 publications

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

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

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

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

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