Si/Co-CoSi2/reduced graphene oxide ternary nanocomposite anodes for Li-Ion batteries with enhanced capacity and cycling stability

Effect of Cobalt Doping on Enhanced Lithium Storage Performance of Nanosilicon

“…In particular, the SiCo05 % electrode attained 97.2 % capacity retention, which is better than previously reported metal/Si-based anodes. [26,36,51] To further illustrate the excellent structural stability and electrochemical cycling performance of SiCo05 % electrode, we have carried out a cyclability test for 320 cycles, and corresponding charge/discharge profiles and specific capacity vs. cycle number plots are depicted in Figure S6. From the results, it is evident that SiCo05 % delivered excellent long time cycle stability with 3029/3003 specific capacity with 86.4 % CE.…”

“…These results are far better than those for the previously reported Si/metal anodes. [28,36,51] For the commercialization of anode materials, better electrochemical performance and high mass loading are necessary for the active electrode materials. To this end, we further evaluated the cyclability of SiCo05 % electrode with a high mass loading of~3.2 mg cm À 2 (thickness:~130 μm) at high applied current densities.…”

“…All these reports suggested that doping with Co encourages lithium kinetics and enhances the host electrode's electrochemical properties. However, to the best of our knowledge, there is only one report on the combination of Si and Co for LIBs that shows better cyclability and rate capability over the bare Si anode [36] . There are hardly any reports about the doping of metals into silicon nanoparticles as anode materials.…”

Structure‐Controllable Binary Nanoporous‐Silicon/Antimony Alloy as Anode for High‐Performance Lithium‐Ion Batteries

“…The cathodic peak at around 1.2 V disappearing in subsequent cycles is virtue of the electrolyte decomposition and formation of a solid electrolyte interface (SEI) film, implying that SEI film mainly forms during first cycle, and it is the main reason of initial capacity loss . In the subsequent cycles, the cathodic peak located at 0.79 V is assigned to the lithiation of Sb, and the peak at around 0.22 V can be attributed to the Li‐alloying reactions of Si . In the anode reactions, the peaks at 0.36 V (& 0.53 V) and the peak at 1.09 V can be ascribed to delithiation of Li x Si and Li 3 Sb, respectively.…”

“…The Si‐based electrode has been served as promising anode materials for LIBs owing to the high lithium storage, relatively low discharge potential and low‐cost of Si among the multitudinous negative materials . However, Si electrode suffers a severe polarization phenomenon due to its high capacity and intrinsic semiconductor features, causing voltage hysteresis . Besides, it delivers poor electrochemical properties because of the huge volume expansion (more than 300 % for Si to Li 4 Si) and shedding of active substances during charge/discharge process .…”