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Author:

Cao Li (Cao Li.) | Huang Ting (Huang Ting.) (Scholars:黄婷) | Zhang Qingwei (Zhang Qingwei.) | Cui Mengya (Cui Mengya.) | Xu Jiejie (Xu Jiejie.) | Xiao Rongshi (Xiao Rongshi.) (Scholars:肖荣诗)

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PubMed

Abstract:

Si has been extensively investigated as an anode material for lithium-ion batteries because of its superior theoretical capacity. However, a scalable fabrication method for a Si-based anode with high initial coulombic efficiency (ICE) and large volumetric capacity remains a critical challenge. Herein, we proposed a novel porous Si/Cu anode in which planar Si islands were embedded in the porous Cu matrix through combined laser additive manufacturing and chemical dealloying. The compositions and dimensions of the structure were controlled by metallurgical and chemical reactions during comprehensive interaction. Such a structure has the advantages of micro-sized Si and porous architecture. The planar Si islands decreased the surface area and thus increased ICE. The porous Cu matrix, which acted as both an adhesive-free binder and a conductive network, provided enough access for electrolyte and accommodated volume expansion. The anode structure was well maintained without observable mechanical damage after cycling, demonstrating the high structure stability and integrity. The porous Si/Cu anode showed a high ICE of 93.4% and an initial volumetric capacity of 2131 mAh cm-3, which retained 1697 mAh cm-3 after 100 cycles at 0.20 mA cm-2. Furthermore, the full-cell configuration (porous Si/Cu //LiFePO4) exhibited a high energy density of 464.9 Wh kg-1 and a capacity retention of 84.2% after 100 cycles.

Keyword:

lithium-ion batteries initial coulombic efficiency laser additive manufacturing dealloying volumetric capacity porous Si/Cu

Author Community:

  • [ 1 ] [Cao Li]High-Power and Ultrafast Laser Manufacturing Lab, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
  • [ 2 ] [Huang Ting]High-Power and Ultrafast Laser Manufacturing Lab, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
  • [ 3 ] [Zhang Qingwei]High-Power and Ultrafast Laser Manufacturing Lab, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
  • [ 4 ] [Cui Mengya]High-Power and Ultrafast Laser Manufacturing Lab, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
  • [ 5 ] [Xu Jiejie]High-Power and Ultrafast Laser Manufacturing Lab, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
  • [ 6 ] [Xiao Rongshi]High-Power and Ultrafast Laser Manufacturing Lab, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

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Source :

ACS applied materials & interfaces

ISSN: 1944-8252

Year: 2020

Issue: 51

Volume: 12

Page: 57071-57078

9 . 5 0 0

JCR@2022

ESI HC Threshold:169

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 24

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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