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Title: Nitrogen-doped graphene-wrapped Cu2S as a superior anode in sodium-ion batteries

Journal Article · · Carbon
 [1];  [2];  [3];  [4];  [2];  [2];  [2];  [1]
  1. Univ. of Arkansas, Fayetteville, AR (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  3. Univ. of Chicago, IL (United States)
  4. Univ. of Arkansas, Fayetteville, AR (United States); University of Science and Technology Beijing (China)

Sodium-ion batteries (SIBs) have been attracting an ever-growing research interest, mainly ascribed to their cost-effectiveness. However, SIBs have been significantly hindered by lack of a suitable anode. Herein, an exceptional Cu2S-based composite anode is developed via a facile ball-milling method, in which Cu2S particles are wrapped by nitrogen-doped graphene sheets (Cu2S@NG). This Cu2S@NG composite anode enables extremely long cycling life, ultra-stable cyclability with high capacity, and excellent rate capability. The superior performance of the Cu2S@NG composite is owing to its intriguing core-shell structure and the exceptional properties of both the Cu2S and NG. In this study, it is found that the NG shell yields multiple merits in improving the performance of Cu2S: (i) mitigating the loss of active materials, (ii) constituting a stable interface, (iii) providing improved electrical conductivity and good ionic transfer, and (iv) enhancing mechanical integrity. Additionally, the vital effects of different voltage windows and a surface coating via atomic layer deposition on further enhancing performance are clarified. Significantly, the electrochemical mechanism of Cu2S during sodiation/desodiation is unveiled using advanced synchrotron-based in-situ X-ray diffraction and X-ray adsorption spectroscopy. This work represents a great advance in seeking high-performance anodes in SIBs.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1774278
Journal Information:
Carbon, Vol. 170; ISSN 0008-6223
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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