Hydrangea-Like CuS with Irreversible Amorphization Transition for High-Performance Sodium-Ion Storage.

Zu‐Guang Yang,Yao Xiao,Wei Xiang,Yong‐Chun Li,Gong‐Ke Wang,Xiao‐Dong Guo,Ben‐He Zhong,Zhen‐Guo Wu,Chun‐Jin Wu,Yan‐Jun Zhong,Yu‐Xia Liu,Wei‐Bo Hua

doi:10.1002/advs.201903279

Abstract

Metal sulfides have been intensively investigated for efficient sodium‐ion storage due to their high capacity. However, the mechanisms behind the reaction pathways and phase transformation are still unclear. Moreover, the effects of designed nanostructure on the electrochemical behaviors are rarely reported. Herein, a hydrangea‐like CuS microsphere is prepared via a facile synthetic method and displays significantly enhanced rate and cycle performance. Unlike the traditional intercalation and conversion reactions, an irreversible amorphization process is evidenced and elucidated with the help of in situ high‐resolution synchrotron radiation diffraction analyses, and transmission electron microscopy. The oriented (006) crystal plane growth of the primary CuS nanosheets provide more channels and adsorption sites for Na ions intercalation and the resultant low overpotential is beneficial for the amorphous Cu‐S cluster, which is consistent with the density functional theory calculation. This study can offer new insights into the correlation between the atomic‐scale phase transformation and macro‐scale nanostructure design and open a new principle for the electrode materials' design.

Highlights

Metal sulfides have been intensively investigated for efficient sodium-ion for Na-ion battery and other energy storage materials.[6,7,8,9] Owing to the distinction storage due to their high capacity
The oriented (006) crystal plane growth of the primary CuS nanosheets provide more channels and adsorption sites for Na ions intercalation and the resultant low overpotential is beneficial for sion pathways and reversible structural transformation in the intercalation reaction progresses have been systematically studied in cathode materials,[13,14,15,16,17,18,19,20] and the emergence of an insertion process, a the amorphous Cu-S cluster, which is consistent with the density functional conversion reaction, or an alloying–dealtheory calculation
Loying reaction during the electrochemical process is determined with chalcogenide, which is crucial to reaction pathways and phase transformation.[21,22,23,24,25,26,27,28,29,30]

Summary

Introduction

Metal sulfides have been intensively investigated for efficient sodium-ion for Na-ion battery and other energy storage materials.[6,7,8,9] Owing to the distinction storage due to their high capacity. The oriented (006) crystal plane growth of the primary CuS nanosheets provide more channels and adsorption sites for Na ions intercalation and the resultant low overpotential is beneficial for sion pathways and reversible structural transformation in the intercalation reaction progresses have been systematically studied in cathode materials,[13,14,15,16,17,18,19,20] and the emergence of an insertion process, a the amorphous Cu-S cluster, which is consistent with the density functional conversion reaction, or an alloying–dealtheory calculation.

Results

Conclusion