Coal-derived graphene foam and micron-sized silicon composite anodes for lithium-ion batteries

Insights into Chemical Prelithiation of SiOx/Graphite Composite Anodes through Scanning Electron Microscope Imaging

“…This analysis was performed to obtain the dynamic information about the electrochemical performance, including charge transfer resistance, Warburg impedance, ohmic resistance, capacity fading, electrode polarization degradation, and state of charge. 27 Figure 6e illustrates the Nyquist plots of the EIS spectra for the fresh Pand NP-anodes. The profile on the complex plane depicts the real part (x-axis) of a frequency response function against its imaginary part (y-axis) with frequency as an implicit variable.…”

“…The EIS analysis also supports this conclusion. This analysis was performed to obtain the dynamic information about the electrochemical performance, including charge transfer resistance, Warburg impedance, ohmic resistance, capacity fading, electrode polarization degradation, and state of charge Figure e illustrates the Nyquist plots of the EIS spectra for the fresh P- and NP-anodes.…”

“…We used SiO powder (d50 = 5 μm, Sigma-Aldrich) and humic acid (HA) extracted and purified from North Dakota lignite, as reported in previous studies. 27 Sodium hydroxide, ethylenediaminetetraacetic acid (EDTA), concentrated hydrochloric acid, and polyacrylic acid (MW = 45 000) were purchased from Alfa Aesar. Commercial battery-grade graphite, sodium carboxymethyl cellulose (CMC), and styrene−butadiene rubber (SBR) were purchased from the MTI Corporation.…”

“…We used SiO powder (d50 = 5 μm, Sigma-Aldrich) and humic acid (HA) extracted and purified from North Dakota lignite, as reported in previous studies . Sodium hydroxide, ethylenediamine­tetraacetic acid (EDTA), concentrated hydrochloric acid, and polyacrylic acid (MW = 45 000) were purchased from Alfa Aesar.…”

Construction of a core–double-shell structured Si@graphene@Al2O3 composite for a high-performance lithium-ion battery anode

“…The proposed strategies include (1) decreasing the size of the Si material or lowering the dimensions of the Si material to alleviate the produced mechanical stress during the lithiation process; 8,[13][14][15] (2) developing diverse coatings to consolidate the microstructure of Si species and avoiding the continuous deposition of a solid electrolyte interphase (SEI) layer on the Si surface during the lithiation process; [16][17][18][19][20][21] (3) adding chemical additives in electrolyte to stabilize the SEI layer; [22][23][24][25] and (4) compositing the Si with highly conductive materials. [26][27][28] Despite the remarkable progress, the electrochemical a Jiangxi Province Key Laboratory of Power Battery and Materials, Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, P. R. China b Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and performance of the Si anode, especially its cycling stability and rate capability, is still unsatisfactory and is far away from its applications in LIBs. Currently, most reports on high performance Si anodes are mainly based on the loosely distributed nanospecies (nanoparticles, nanowires, nanotubes, etc.…”