Investigation of Electrochemical Performance on SnSe₂ and SnSe Nanocrystals as Anodes for Lithium Ions Batteries

Abstract

SnSe2 and SnSe nanocrystals were prepared using a simple solvothermal method by changing the molar ratio of SnCl[Formula: see text]2H2O and Se powder. When SnSe2 and SnSe are acted as lithium ion battery anodes, the SnSe hybrid structure shows more excellent electrochemical performance than that of SnSe2 interconnected nanosheet. It delivers a reversible capacity of 1023[Formula: see text]mAh[Formula: see text]g[Formula: see text] at a current density of 200[Formula: see text]mA[Formula: see text]g[Formula: see text], and maintaining a capacity of 498[Formula: see text]mAh[Formula: see text]g[Formula: see text] till 120 cycles. According to many present works, SnSe2 with interconnected thin nanosheet should possess more superior property than hybrid structured SnSe due to short charge transfer paths. However, in our research, the result is the opposite. Therefore, we consider that the superior electrochemical performance of SnSe is attributed to its highly reversible conversion reaction mechanism than SnSe2.

Confining Nano-GeS2 in Cross-Linked Porous Carbon Networks for High-Performance and Flexible Li-Ion Battery Anodes

“…Moreover, the rate cycle performance of GeS 2 /C-2 was investigated, and the results under various current densities (0.1–4.0 A g –1 ) are presented in Figure c, GeS 2 /C-2 delivered a reversible capacity of about 585 mA h g –1 when the current density further changed to 0.2 A g –1 , suggesting the good rate cycle performance of GeS 2 /C-2. The performance of GeS 2 /C-2 was also compared with reported chalcogenides in the literatures, − as shown in Figure d. GeS 2 /C-2 showed one of the best performances compared to chalcogenides, such as high reversible capacity of discharge/charge at 0.1 A g –1 or high reversible capacity of rate cycles.…”

Terminal Group‐Oriented Self‐Assembly to Controllably Synthesize a Layer‐by‐Layer SnSe2 and MXene Heterostructure for Ultrastable Lithium Storage

“…As displayed in Figure 4c, the LBL‐SnSe 2 @MXene still maintains a stable capacity of 410 mAh g −1 after running 16 000 cycles at an ultra‐high current density of 5 C. Moreover, the Coulombic efficiency of the LBL‐SnSe 2 @MXene is quite stable, which is nearly 100% in almost all cycles except for the initial several cycles. Compared to other metal selenides reported in the literature, [ 11,12,18,63–71 ] the performance of LBL‐SnSe 2 @MXene is highly competitive, especially with high capacity and ultra‐long cycling performance at large current densities. The detailed capacity comparison is listed in Table S5 (Supporting Information).…”