Fully Active Bimetallic Phosphide Zn0.5Ge0.5P: A Novel High-Performance Anode for Na-Ion Batteries Coupled with Diglyme-Based Electrolyte


Liu G. Yang Y. Lu X. Qi F. Liang Y. Trukhanov A. Wu Y. Sun Z. Lu X.
20 July 2022American Chemical Society

ACS Applied Materials and Interfaces
2022#14Issue 2831803 - 31813 pp.

Metal phosphides are promising candidates for sodium-ion battery (SIB) anode owing to their large capacities with suitable redox potential, while the reversibility and rate performances are limited due to some electrochemically inactive transition-metal components and sluggish reaction kinetics. Here, we report a fully active bimetallic phosphide Zn0.5Ge0.5P anode and its composite (Zn0.5Ge0.5P-C) with excellent performance attributed to the Zn, Ge, and P components exerting their respective Na-storage merit in a cation-disordered structure. During Na insertion, Zn0.5Ge0.5P undergoes an alloying-type reaction, along with the generation of NaP, Na3P, NaGe, and NaZn13phases, and the uniform distribution of these phases ensures the electrochemical reversibility during desodiation. Based on this reaction mechanism, excellent electrochemical properties such as a high reversible capacity of 595 mAh g-1and an ultrafast charge-discharge capability of 377.8 mAh g-1at 50C for 500 stable cycles were achieved within the Zn0.5Ge0.5P-C composite in a diglyme-based electrolyte. This work reveals the Na-storage reaction mechanism within Zn0.5Ge0.5P and offers a new perspective on designing high-performance anodes.

bimetallic phosphide , phosphorus-based anode , sodium-ion batteries , synergistic effect , zinc-blende Zn0.5Ge0.5P

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School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China
School of Materials, Sun Yat-Sen University, Guangzhou, 510275, China
Department of Agricultural and Biosystems Engineering, South Dakota State University, Brookings, 57007, SD, United States
South Ural State University, Chelyabinsk, 454080, Russian Federation
SSPA, Scientific and Practical Materials Research Centre of NAS of Belarus, Minsk, 220072, Belarus
L.N. Gumilyov Eurasian National University, 2, Satpayev Str., Nur-Sultan, 010000, Kazakhstan
Analysis and Test Center, Guangdong University of Technology, Guangzhou, 510006, China

School of Materials and Energy
School of Materials
Department of Agricultural and Biosystems Engineering
South Ural State University
SSPA
L.N. Gumilyov Eurasian National University
Analysis and Test Center

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