Graphene‐Encapsulated Copper tin Sulfide Submicron Spheres as High‐Capacity Binder‐Free Anode for Lithium‐Ion Batteries

Abstract

Sn‐based sulfides are potential anode materials for lithium‐ion batteries (LIBs); nevertheless, they typically suffer from poor cycle stability resulted from the huge volume variation during lithium‐ion insertion and extraction. Herein, we successfully fabricated the multiphase Cu2Sn3S7/Cu2SnS3/SnS2 (CTS) submicron spheres uniformly incorporated with reduced graphene oxide nanosheets (CTS@RGO). This binder‐free hybrid CTS@RGO paper exhibits favorable capacity retention as an anode of LIBs (965 mAh g−1 after 300 cycles at current density of 500 mA g−1), as well as better rate capability and high initial coulombic efficiency compared with that of a pristine CTS anode. The enhanced electrochemical performance can be ascribed to the introduction of graphene as a buffer to accommodate large volume changes and to maintain structural integrity of electrode.

Double Morphology of Co9S8 Coated by N, S Co-doped Carbon as Efficient Anode Materials for Sodium-Ion Batteries

“…With the rapid development of power reserve systems in electric vehicles and portable electronic products, sodium-ion batteries (SIBs) have become a strong competitor to lithium-ion batteries (LIBs), because of the similar charge-discharge behavior to LIBs, low cost, and vast natural reserves [1][2][3]. And the electrochemical potential of Na (− 2.71 V vs the standard hydrogen electrode, SHE) is higher than that of Li (− 3.04 V) with 330 mV, which makes SIBs possible to meet large-scale energy storage demands [4][5][6]. However, the most important challenge in SIBs is the large volume expansion during the process of sodiation originated from the great strain derived from the larger radius of Na + (1.02 Å) than Li + (0.76 Å) [7,8].…”

Lithium Pre‐cycling Induced Fast Kinetics of Commercial Sb2S3 Anode for Advanced Sodium Storage

“…High‐resolution XPS spectra were determined elemental surface composition. Based on the S 2p spectrum (Figure b), CSS and LSS show two sharp characteristic peaks with binding energy of 161.3 and 162.5 eV, which can be assigned to the 2p 3/2 and 2p 1/2 orbital of S 2− from the metal sulfide . As depicted in Figure c, two Gaussian peaks centered at 529.3 and 538.7 eV were observed in CSS and shifted to 529.5 and 538.9 eV in LSS, which correspond to the 3d 5/2 and 3d 3/2 orbital of Sb 3+ .…”

Single‐Phase Cu3SnS4 Nanoparticles for Robust High Capacity Lithium‐Ion Battery Anodes

“…The CTS NPs exhibit a very low internal resistance implying that the electrolyte accessibility to the electrode surface is good as the particle size is small whereby the ion diffusion pathway is shortened. [33] The peaks vary in intensity in subsequent cycles owing to the slow dissolution of sulfides in electrolyte during the lithiation and delithiation process. During the first cathodic scan, the peak at 2 V corresponds to the conversion of Cu 3 SnS 4 to Cu and Sn.…”

“…[31,32] The de-lithiation peaks from 1.0 V to 2.25 V evince the recombination of Cu and Sn species. [33] The peaks vary in intensity in subsequent cycles owing to the slow dissolution of sulfides in electrolyte during the lithiation and delithiation process. [20] The results of the galvanostatic charge discharge measurements performed in the voltage range 0.01 V to 3.0 V are presented in Figure 4.…”