Hollow Spheres Consisting of SnS Nanosheets Conformally Coated with S‐Doped Carbon for Advanced Lithium‐/Sodium‐Ion Battery Anodes

Abstract

Although tin sulfide is a promising anode material for lithium‐ and sodium‐ion batteries due to the layered structure and high theoretical capacity, the large volume expansion and poor kinetics have seriously hindered further development and application. In this work, hollow spheres consisting of in situ generated SnS nanosheets (SnS@C HSs) conformally coated with S‐doped carbon are fabricated using polystyrene spheres as the self‐sacrifice template and carbon source. The SnS@C HSs with a large SnS interlayer distance, S‐doped carbon matrix, and hollow structure not only relieve the pressure caused by volume expansion during cycling, but also promote fast transfer of lithium/sodium ions leading to a high pseudocapacitance. The SnS@C HSs have excellent electrochemical properties in both LIBs and SIBs such as high capacity, high rate, and outstanding cycling stability. The use of a self‐sacrifice template is demonstrated to be a convenient and efficient strategy to design and prepare carbon‐coated metal hollow spheres for efficient energy storage and conversion.

Molecular grafting towards high-fraction active nanodots implanted in N-doped carbon for sodium dual-ion batteries

“…We firstly carried out the cyclic voltammogram (CV) measurement to investigate the Na + -storage behavior of the SnP 2 O 7 @N-C anode. Figure 3 a exhibits the first three CV curves at 0.1 mV s −1 in the potential range of 0.01–3.0 V. In the first sodiation process, there are multiple peaks situated at 1.55, 1.10, 0.58, 0.39 and 0.07 V. According to previous reports, the Na-Sn alloying reactions occurred at potentials below 0.9 V [ 70 , 72 ]. Thus, the first two peaks should involve the conversion process of SnP 2 O 7 to metallic Sn, and the others stem from the Na–Sn alloying reactions [ 70 , 71 ].…”

Construction of Sb2S3@SnS@C Tubular Heterostructures as High-Performance Anode Materials for Sodium-Ion Batteries

“…Besides, the sodium-ion storage capacity of Sb 2 S 3 @SnS@C is mainly derived from the fast capacitive processes. This can be demonstrated by the capacitive contribution, which is increased from 83.7% to 92.8% with the increasing scan rate (Figure g), or, said differently, here the rate performance can benefit from the fast capacitive processes. , The reason for the pseudocapacitive behavior of the rapid charge of the Sb 2 S 3 @SnS@C electrodes can be explained as follows: (1) The hollow tubular-like structure has a delicate nanostructure and a high specific surface area, which greatly facilitate the transfer of surface charges and the diffusion of electrolyte ions. , (2) The S, N-codoped porous carbon layer covering the surface of Sb 2 S 3 @SnS can provide a large number of active sites and defects to accelerate the electron transport …”

“…52,53 (2) The S, N-codoped porous carbon layer covering the surface of Sb 2 S 3 @SnS can provide a large number of active sites and defects to accelerate the electron transport. 54 The DFT calculations were performed to have an in-depth understanding of the nature of the interface generated from the heterostructure. Here, the first Brillouin zone was sampled with a 4 × 1 × 2 Γ-centered grid, which is convergence by a test calculation with a denser k-point set of 6 × 2 × 2 for both cases.…”

Boron‐Catalyzed Graphitization Carbon Layer Enabling LiMn0.8Fe0.2PO4 Cathode Superior Kinetics and Li‐Storage Properties

“…[ 10 ] Guo et al. [ 11 ] investigated that hollow spheres consisting of in situ generated SnS nanosheets conformally coated with S‐doped carbon displayed outstanding cycling stability in both lithium‐ion and sodium‐ion batteries with a cyclic decay rate of 0.0068% in 1000 cycles. In particular, the S‐doped 3D carbon framework of the SnS nanosheets is regarded as a robust buffer against structural destruction, providing fast ion/electron transfer channels and improving the insertion/deintercalation kinetics of Li + /Na + .…”