Fabrication and understanding of Cu₃Si-Si@carbon@graphene nanocomposites as high-performance anodes for lithium-ion batteries

Abstract

A high-performance anode material of Cu3Si-SCG is developed with outstanding rate capability and cycle stability for lithium-ion batteries.

Synthesis of Co/SnO2 core-shell nanowire arrays and their electrochemical performance as anodes of lithium-ion batteries

“…It can be seen that the curve of the oxidation-reduction potential of SnO 2 is consistent with the previous paper [40]. There is a reduction peak at~0.8 V, which is related to the decomposition of lithium oxide and the formation of solid electrolyte interface (SEI) layer [41], while the broader peak between 0.1~0.5 V corresponds to the alloying reaction process of Li and Sn, as shown in the reaction Formula (1): The oxidation peak of 0.6 V in the oxidation process refers to the dealloying process of Li 4.4 Sn [42]. Two peaks of 0.7 and 1.3 V disappear in the second and third cycles, and a small reduction peak arises at~1.2 V. That is because the lithium intercalation of SnO 2 is irreversible, just like the reaction Formula (2):…”

Tin Nanoparticles Encapsulated Carbon Nanoboxes as High-Performance Anode for Lithium-Ion Batteries

“…The Sn@C yolk-shell materials deliver initial discharge and charge capacities of 821.5 and 500.3 mAh g −1 at 0.8 A g −1 in a voltage range from 0.01 to 3 V, corresponding to the first coulombic efficiency of 60.9% (Figure 4C ). The largely irreversible capacity loss at the first cycle is related to the formation of SEIs consuming active Li, and can be compensated by prelithiation through either chemical or electrochemical methods or by using stabilized Li metal powder (Zhang et al, 2018a ; Zheng et al, 2018a ). The reversible capacity quickly decreases to 272.3 mAh g −1 at 37th cycle, which could mainly be attributed to the structural degradation and reorganization (Sun et al, 2014 ).…”

N-doped porous carbon nanofibers sheathed pumpkin-like Si/C composites as free-standing anodes for lithium-ion batteries

“…Among the existing candidates, Si anodes have been regarded as the most promising alternative to graphite for LIBs ascribing to the abundant natural resources, low discharge potential (~0.4 V versus Li/Li + ), and high theoretical specific capacity (~3579 mA h g À1 Li 15 Si 4 ) [13][14][15]. However, Si anodes suffer from several challenges, including severe volume change (>270%) during the Li + ion insertion/extraction process, excessive accumulation of solid electrolyte interphase (SEI) during cycling, and low intrinsic electronic conductivity, resulting in rapid capacity fading upon cycling and poor rate capability [16][17][18]. Recent works attempted to use Si in the design of nanostructures, such as nanorods [19], nanowires [20], nanotubes [21], nanoporous structures [22], and nanosheets [23], to alleviate its severe volume change during cycling.…”