@article{Zhu2023, 
author = {Kefu Zhu and Shiqiang Wei and Quan Zhou and Shuangming Chen and Yunxiang Lin and Pengjun Zhang and Yuyang Cao and Changda Wang and Yixiu Wang and Yujian Xia and Dengfeng Cao and Zeinab Mohamed and Xin Guo and Xiya Yang and Xiaojun Wu and Li Song},
title = {Interface regulation of Cu2Se via Cu–Se–C bonding for superior lithium-ion batteries},
year = {2023},
journal = {Nano Research},
volume = {16},
number = {2},
pages = {2421-2427},
keywords = {lithium-ion battery, Cu–Se–C bonding, interface regulation, X-ray absorption spectroscopy (XAS), operando synchrotron radiation X-ray diffraction (SRXRD)},
url = {https://www.sciopen.com/article/10.1007/s12274-022-4953-7},
doi = {10.1007/s12274-022-4953-7},
abstract = {Transition metal selenides have aroused great attention in recent years due to their high theoretical capacity. However, the huge volume fluctuation generated by conversion reaction during the charge/discharge process results in the significant electrochemical performance reduction. Herein, the carbon-regulated copper(I) selenide (Cu2Se@C) is designed to significantly promote the interface stability and ion diffusion for selenide electrodes. The systematic X-ray spectroscopies characterizations and density functional theory (DFT) simulations reveal that the Cu–Se–C bonding forming on the surface of Cu2Se not only improves the electronic conductivity of Cu2Se@C but also retards the volume change during electrochemical cycling, playing a pivotal role in interface regulation. Consequently, the storage kinetics of Cu2Se@C is mainly controlled by the capacitance process diverting from the ion diffusion-controlled process of Cu2Se. When employed this distinctive Cu2Se@C as anode active material in Li coin cell configuration, the ultrahigh specific capacity of 810.3 mA·h·g−1 at 0.1 A·g−1 and the capacity retention of 83% after 1,500 cycles at 5 A·g−1 is achieved, implying the best Cu-based Li+-storage capacity reported so far. This strategy of heterojunction combined with chemical bonding regulation opens up a potential way for the development of advanced electrodes for battery storage systems.}
}