Electrochemical Impedance Spectroscopy study in micro-grain structured amorphous silicon anodes for lithium-ion batteries

Paloukis, Fotios; Elmasides, Costas; Farmakis, Filippos; Selinis, Petros; Neophytides, Stylianos G.; Georgoulas, N.

doi:10.1016/j.jpowsour.2016.09.062

Cited by 38 publications

(31 citation statements)

References 25 publications

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“…The fitting line (Figure 4e) of a typical Nyquist plot measured during the initial lithiation and delithiation process clearly shows the impedance spectrum, which consists of the resistance of the electrolyte solution (R S ), the solid electrolyte interphase (R SEI ), and charge transfer (R ct ). [ 60‐62 ] As depicted in Figure , the resistance of the solid electrolyte interphase is always smaller and more stable for the Si@β‐CD electrode compared to the Si electrode, which indicates that the lithium‐ion channels stabilize the formation of SEI during the initial lithiation and delithiation process. To further investigate the change of the SEI during cycles, in situ EIS was recorded for the first five cycles at the current density of 1 A g −1 .…”

Section: Resultsmentioning

confidence: 99%

β‐cyclodextrin as Lithium‐ion Diffusion Channel with Enhanced Kinetics for Stable Silicon Anode

Chen

Zhang

et al. 2020

Energy & Environ Materials

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Silicon (Si) is regarded as a promising anode material for next‐generation lithium‐ion batteries due to its ultrahigh theoretical capacity. However, the drastic volume change and the continuous solid electrolyte interphase (SEI) formation during the lithiation/delithiation process seriously hinder its practical application as commercial anodes. Herein, macrocyclic beta‐cyclodextrin (β‐CD) has been designed as the diffusion channel for lithium ions at the molecular scale. The diameter of molecular channel is approximately comparable with the solvated lithium ions, which enables the transport of lithium ions and prevents the penetration of solvent molecules. Moreover, the addition of β‐CD changes the formation behavior of SEI layer and stabilizes the Si nanoparticles. The enhanced electrochemical performances in terms of fast kinetics and improved stability have been achieved. The Si anode with the particularly selected lithium‐ion diffusion channel and stabilized SEI layer exhibits a high reversible capability of 2 562 mAh g−1 after 50 cycles at the current density of 500 mA g−1, 1 944 mAh g−1 after 200 cycles at the current density of 1 A g−1, and high rate performance. The novel strategy of molecular channel for lithium‐ion diffusion offers new insights into the design of alloy‐typed anode electrodes with high capacity for lithium‐ion batteries.

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Section: Resultsmentioning

confidence: 99%

β‐cyclodextrin as Lithium‐ion Diffusion Channel with Enhanced Kinetics for Stable Silicon Anode

Chen

Zhang

et al. 2020

Energy & Environ Materials

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“…After the first cycle of galvanostatic charging/discharging for the Si@ CMC-MAH electrode, the impedance reduces dramatically, suggesting the formation of the iron conductive SEI layer. [43,44] The resistance of the electrode reduces continuously at the fifth cycle due to the stabilized SEI layer and improved interfacial contact (Figure 6a), which can be ascribed to the conversion from crystal to amorphous and the CMC and MAH coating layer on the surface. To reveal the Li + ion transport inside the Si@CMC-MAH electrodes, the diffusion coefficient (D Li ) of the Li + ions has been calculated for the first and fifth cycle discharge state, taken from the low frequency (LF) region in the Nyquist plot, according to the following equation:…”

Section: Resultsmentioning

confidence: 99%

“…Electrochemical impedance spectroscopy (EIS) tests were conducted simultaneously at different cycle numbers. After the first cycle of galvanostatic charging/discharging for the Si@CMC‐MAH electrode, the impedance reduces dramatically, suggesting the formation of the iron conductive SEI layer . The resistance of the electrode reduces continuously at the fifth cycle due to the stabilized SEI layer and improved interfacial contact ( Figure a), which can be ascribed to the conversion from crystal to amorphous and the CMC and MAH coating layer on the surface.…”

Section: Resultsmentioning

confidence: 99%

3D Network Binder via In Situ Cross‐Linking on Silicon Anodes with Improved Stability for Lithium‐Ion Batteries

Chen

Lin

et al. 2019

Macro Chemistry & Physics

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Silicon (Si) has attracted intensive academic and commercial attention due to its extremely high theoretical capacity. However, it is still far away from practical application because of its fast capacity fading, which is caused by the huge volume change. Here, a novel network polymer binder is synthesized through in situ thermal crosslinking of water‐soluble carboxymethyl cellulose (CMC) and maleic anhydride (MAH). The as‐obtained polymer binder network can effectively restrict the huge volume change of Si anodes upon lithiation. Because of the significantly enhanced structural stability, the Si anodes with network polymer binder deliver enhanced electrochemical performance, with a capacity of 996 mAh g−1 at a high current density of 1 A g−1 after 120 cycles under high mass loading. Most importantly, a high average Coulomb efficiency (CE) of 99.4% is obtained, which is superior over the average CE (98.7%) of Si only using CMC as binder. It is considered that this novel 3D network cross‐linking binder can be used for high‐capacity anode materials in next‐generation Li‐ion batteries.

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“…32,33 The characteristic peak at 101.7 eV refers to SiO, and the peak at 101.1 eV is ascribed to SiO x , which originate from the exposure of silicon to the ambient environment. [34][35][36] Fig. 2(d) shows the XPS spectrum of the Ag 3d region, in which the peaks at around 368.2 and 374.2 eV can be ascribed to metallic Ag.…”

Section: Resultsmentioning

confidence: 99%

Improved performances of lithium-ion batteries using intercalated a-Si–Ag thin film layers as electrodes

et al. 2018

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Electrochemical Impedance Spectroscopy study in micro-grain structured amorphous silicon anodes for lithium-ion batteries

Cited by 38 publications

References 25 publications

β‐cyclodextrin as Lithium‐ion Diffusion Channel with Enhanced Kinetics for Stable Silicon Anode

β‐cyclodextrin as Lithium‐ion Diffusion Channel with Enhanced Kinetics for Stable Silicon Anode

3D Network Binder via In Situ Cross‐Linking on Silicon Anodes with Improved Stability for Lithium‐Ion Batteries

Improved performances of lithium-ion batteries using intercalated a-Si–Ag thin film layers as electrodes

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