High‐Mobility Cu⁺‐Induced Multi‐Dimensional Structured Copper‐Based Sulfide Anode for Advanced Sodium Ion Batteries
Year: 2025
Type: article
Abstract: The pursuit of advanced anode materials to address inferior conductivity and slow ion diffusion has driven the development of fast‐charging sodium‐ion batteries (SIBs). Herein, a promising anode material of KCu 7 S 4 nanowires with a tunnel structure is proposed for SIBs. The Na + (de)insertion mechanisms of the KCu 7 S 4 anode are comprehensively elucidated through a combination of in situ TEM/SAED/XRD analyses and theoretical calculations. The detailed intermediates (Na 3 Cu 4 S 4 , NaCuS) and final products (CuS, Cu) during (de)sodiation processes are identified, revealing that the highly mobile Cu + ion can facilitate the formation of tunnel‐structured Na 3 Cu 4 S 4 and layer‐structured NaCuS during the electrochemical reaction process. The reaction dynamics indicate that the formation of Na 3 Cu 4 S 4 and NaCuS intermediates facilitates electron transfer and ion diffusion during Na + (de)insertion. Moreover, the KCu 7 S 4 anode exhibits a high discharge capacity of 337 mAh g −1 at 10 A g −1 , and the corresponding Na 3 V 2 (PO 4 ) 3 //KCu 7 S 4 full cell delivers a high energy density of 303 Wh kg −1 at 375 W kg −1 , demonstrating its excellent application prospect. This work opens a new avenue for fast‐charging electrode materials for advanced SIBs.
Source: Advanced Functional Materials
Authors: Ying Guo, Hui Wang, Chenke Yang, Shuge Dai, Ye Wang, Shaobo Cheng
Institution: Zhengzhou University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4410518514