Synergetic Sn Incorporation‐Zn Substitution in Copper‐Based Sulfides Enabling Superior Na‐Ion Storage

Abstract

Transition‐metal sulfides have been regarded as perspective anode candidates for high‐energy Na‐ion batteries. Their application, however, is precluded severely by either low charge storage or huge volumetric change along with sluggish reaction kinetics. Herein, an effective synergetic Sn incorporation‐Zn substitution strategy is proposed based on copper‐based sulfides. First, the Na‐ion storage capability of copper sulfide is significantly improved via incorporating an alloy‐based Sn element. However, this process is accompanied with the sacrifice of structural stability due to the high Na‐ion uptake. Subsequently, to maintain the high Na‐ion storage capacity, and concurrently improve the cycling and rate capabilities, a Zn substitution strategy (taking partial Sn sites) is carried out, which could significantly promote the Na‐ion diffusion/reaction kinetics and relieve the mechanical strain‐stress within the crystal framework. The synergetic Sn incorporation and Zn substitution endow the copper‐based sulfides with high specific capacity (∼560 mAh g−1 at 0.5 A g−1), ultrastable cyclability (80 k cycles with ∼100% capacity retention), superior rate capability up to 200 A g−1, and ultrafast charging feature (∼4 s per charging with ∼190 mAh g−1 input). This work provides in‐depth insights for developing superior anode materials via synergetic multi‐cation incorporation/substitution, aiming at solving their intrinsic issues of either low specific capacity or poor cyclability.This article is protected by copyright. All rights reserved

3D Micro‐Flower Structured BiFeO3 Constructing High Energy Efficiency/Stability Potassium Ion Batteries Over Wide Temperature Range

“…As demonstrated in Figure S26 and Tables S3,S4 (Supporting Information), the distortion of BiFeO 3 super-cell is smaller than Bi 2 O 3 upon insertion of two K + ions, indicating that BiFeO 3 possesses higher structural stability than Bi 2 O 3 upon insertion of K + ions, and the curves regarding strain energy versus volume deformation in Figure S27 (Supporting Information) evidence that BiFeO 3 exhibits smaller slope than Bi 2 O 3 case, which further elucidate the superior structural stability of bi-metal bismuth-based BiFeO 3 to Bi 2 O 3 . [70] Electrochemical measurements and DFT calculations above reveal that the superior K + storage performance of BFO-MF could be ascribed to: i) facilitated electrolyte accessibility and highly structural stability for the 3D flower-like morphology, ii) intrinsically high preference for insertion of K + ion and fast diffusion of K + ion concerned with (110) facet.…”

Room-temperature synthesis of nonstoichiometric copper sulfide (Cu2−xS) for sodium ion storage

“…12–24 The copper sulfide family, which is a vital representative of sulfides, have garnered significant interest due to their myriad benefits, including cost-effectiveness, non-toxicity, and the abundant availability of both the elements of copper and sulfur. 25–27 Particularly, copper sulfides show excellent sodium-ion storage properties; 28–30 and furthermore, nonstoichiometric copper sulfide exhibits superior performances for the intrinsic vacancy defects and lower sodium-ion diffusion energy barrier. 31 Unlike the simple room-temperature precipitation method for the preparation of CuS, however, the preparation of nonstoichiometric copper sulfide normally requires elevated temperature.…”

A bimetallic sulfide FeCoS4@rGO hybrid as a high-performance anode for potassium-ion batteries

“…5,6 However, challenges that need to be addressed are cycling stability, volume expansion, unstable solid electrolyte interphase (SEI), contraction, and practical implementation in commercial batteries. 7–9…”