Enhanced capacity retention based silicon nanosheets electrode by CMC coating for lithium-ion batteries

Abstract

Si nanosheets (SiNS) as two dimensional Si nanomaterials are promising candidates for anodes of lithium ion batteries (LIBs) by their large surface area and excellent mechanical durability. In this study, we fabricated polymeric binder (carboxymethyl cellulose, CMC) coated SiNS electrodes using a spin-coating process and characterized the electrochemical properties. The CMS coated SiNS electrodes were homogeneously covered with a CMC polymer layer and showed the improved capacity retention with maintaining over 90% of initial capacity after several cycles. The result of electrochemical impedance spectroscopy indicates that the CMC layer provide the chemical stability of Si surface and suppress the continuous growth of the SEI layer. Furthermore, CMC coated layer on SiNS provide improved mechanical stability that maintains the adhesion of SiNS to the current collector during the discharge-charge cycles.

Multilayer Silicene Nanosheets Derived from a Recycling Process Using End-of-Life Solar Cells Producing a Silicene/Graphite Composite for Anodes in Lithium-Ion Batteries

“…The dQ/dV plots clearly show two peaks of silicene at ∼0.17 V and ∼0.25 V, corresponding to the phase transition from Si to Li x Si and the phase transition to Si, respectively. 15,39 This characteristic is consistent with the dQ/ dV plots of pure silicene, as shown in Figure S9. Interestingly, the plateaus of silicene can also be observed in every cycle (see the inset of Figure 4d).…”

“…To clearly identify the plateaus of silicene/Gr composite, we demonstrate the differential capacity (d Q /d V ) plots derived from charge–discharge curve of silicene/Gr during the first, second, 50th, 100th, 200th, 300th, and 500th cycles, as shown in Figure d. The d Q /d V plots clearly show two peaks of silicene at ∼0.17 V and ∼0.25 V, corresponding to the phase transition from Si to Li x Si and the phase transition to Si, respectively. , This characteristic is consistent with the d Q /d V plots of pure silicene, as shown in Figure S9. Interestingly, the plateaus of silicene can also be observed in every cycle (see the inset of Figure d).…”

Rational Design of Cellulose Nanofibrils Separator for Sodium-Ion Batteries

“…The capacity retention rate after 50 cycles at 50 mA/g was 90.82, 87.01 and 93.80% for glass fiber, TOCNF-EF and TOCNF-HEF, respectively. TOCNF-HEF achieved the highest capacity and stability, thanks to a large number of uniformly distributed channels for Na + transport, and polar chemical groups helped to form a stable interface between separator and electrode [ 20 ].…”

Review on Action Mechanism and Characterization of Natural/Artificial Solid Electrolyte Interphase of Lithium Battery: Latest Progress and Future Directions

“…AFM technology in the research on SEI film is not limited to this. − For example, Huang et al used electrochemical atomic force microscope AFM to study morphology, − force model analysis, and composition difference of Si electrode surface structure in EC and Fe-based electrolytes. In addition to AFM technology, the research center also uses XPS technology.…”