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

Abstract

The vast volume expansion of Si anode during charging process leads to the rapid cycling performance fading and limits its applications in lithium-ion batteries. In this study, a unique cored-double-shell...

Scalable synthesis of porous graphite/silicon@pitch carbon nanocomposites derived from wastes of silica fume for high-performance lithium storage

“…The slope at about 0.5–1.0 V corresponds to the decomposition of the electrolyte and its irreversible reaction with the electrode material, which results in the formation of an SEI film on the surface of the electrode. 69,70 In the charging process, the broad plateau below 0.3 V stems from the de-alloying reaction of lithium from the Li x Si phase. The SG/Si@C-5 electrode delivers initial discharge/charge capacities of 1057.27 and 870.63 mA h g −1 with an ICE of 82.34%.…”

Investigation of Polyacrylonitrile‐Derived Multiple Carbon Shell Composites for Silicon‐Based Anodes in Lithium‐Ion Batteries

“…In Table S3 we summarize and compare publications evaluating silicon-carbon composites with multiple carbon shells showing a superior capacity retention at high specific capacities for our Si@MCS-1000/1000-30 composite. [28,29,44,45] By using PAN as the carbon source for both carbon shells we were able to dedicate the positive effects to the improved composite structure. The comparably higher capacities and capacity retentions are very promising and an important step towards enabling silicon dominant anodes in lithium-ion batteries.…”

Honeycomb-like micro-/nano-hierarchical porous germanium for high-performance lithium-ion battery anodes

“…15–17 Among them, Ge has attracted much attention due to its high gravimetric/volumetric specific capacities close to those of Si (1625 mA h g −1 and 8645 Ah L −1 for Ge vs. 3579 mA h g −1 and 9781 Ah L −1 for Si). 18–20 Moreover, the lithium-ion diffusion coefficient and electrical conductivity of the Ge anode are 400 times and 104 times higher than those of the Si anode, respectively. 17,21 Unfortunately, similar to that of the Si anode, the huge volume expansion of the Ge anode (∼300%, Li 4.4 Ge) during the delithiation/lithiation process would also lead to the pulverization of the active substance and the continuous growth of the solid electrolyte interphase (SEI) film, resulting in the low initial Coulombic efficiency (ICE) and rapid capacity deterioration, and thus seriously hindering the application of the Ge anode in LIBs.…”