Electrochemical characteristics of amorphous silicon carbide film as a lithium-ion battery anode

Abstract

The electrochemical reactions of SiC film with Li+ have been investigated by electrochemical characterization and X-ray photoelectron spectroscopy.

Seaweed-Liked WS2/rGO Enabling Ultralong Cycling Life and Enhanced Rate Capability for Lithium-Ion Batteries

“…The first discharge/charge capacity of the WS 2 /rGO composites comes to 895.8 mAh·g −1 and 546.3 mAh·g −1 , causing a high premier Coulombic efficiency of 60.9%. The nonreversible loss of the first cycle is probably ascribed to the adverse reactions between Li + and the residual oxygen-containing functional groups on the WS 2 /rGO composites, and the formation of SEI film during lithium ion intercalation process [43,44,45,46,47], which makes the following discharge curves exhibit a totally different voltage plateau at 2.0 V, in conformity to the aforementioned CV curves, suggesting the superior electrochemical property of the WS 2 /rGO composites. This was also explained by the similarity between the 2nd, the 10th and the 1000th charge/discharge profiles of the WS 2 /rGO (Figure 4b) and their near coulombic efficiency after the first several cycles in Figure 4c.…”

Simple Synthesis of K4Nb6O17/C Nanosheets for High-Power Lithium-Ion Batteries with Good Stability

“…The drastic drop in capacity is often associated with inevitable irreversible loss of lithium ions for the formation of the solid electrolyte interface layer (SEI). Unlike in many other battery chemistries, such as the LiFePO 4 , where extra lithium is provided for in the electrode to compensate for amount of lithium used for the SEI layer formation, the K 4 Nb 6 O 17 -C electrode do not have that extra Li+ for this purpose [20,26,27,28,29]. The possible mechanisms of lithium ion intercalation:normalNb5++e−→normalNb4+ K4normalNb6O17+normalLi++e−→normalLnormaliK4normalNb6O17 normalC+normalxnormalLi++normalxe−→normalLixnormalC…”

Optimized Porous Si/SiC Composite Spheres as High‐Performance Anode Material for Lithium‐Ion Batteries

“…The initial discharge and charge capacity of bare pSi and pSi/SiC are 1612.4, 1000.5 mAh g −1 and 2622.1, 1916.3 mAh g −1 , with initial coulombic efficiency of 62.1 % and 73.1 %, respectively. The capacity loss is common in Si‐based and transition metal oxide anodes, which due to the formation of SEI films, and minority irreversibly lithiation of SiC/SiO 2 . We estimated the initial reversible capacities of SiC/SiO 2 in pSi/SiC and bare pSi sample (charge curves at ∼0.6–1.2 V, Figure c and d), exhibiting ∼340 and ∼130 mAh g −1 , respectively.…”

“…The capacity loss is common in Si-based and transition metal oxide anodes, which due to the formation of SEI films [37,38] and minority irreversibly lithiation of SiC/SiO 2 . [39][40][41][42] We estimated the initial reversible capacities of SiC/SiO 2 in pSi/SiC and bare pSi sample (charge curves at~0.6-1.2 V, Figure 5 c and d), exhibiting~340 and~130 mAh g À 1 , respectively. So we speculate the initial reversibility of SiC is better than that of SiO 2 due to the smaller and relatively uniform particle size of SiC and the uncontrollable and inhomogenous SiO 2 layer thickness.…”