TY - JOUR
T1 - Porous Si/Cu Anode with High Initial Coulombic Efficiency and Volumetric Capacity by Comprehensive Utilization of Laser Additive Manufacturing-Chemical Dealloying
AU - Cao, Li
AU - Huang, Ting
AU - Zhang, Qingwei
AU - Cui, Mengya
AU - Xu, Jiejie
AU - Xiao, Rongshi
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (No. 51975018). The authors are grateful to Dr. Yao Zhou and Dr. Hailong Wang for helpful discussions.
Publisher Copyright:
©
PY - 2020/12/23
Y1 - 2020/12/23
N2 - 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.
AB - 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.
KW - dealloying
KW - initial coulombic efficiency
KW - laser additive manufacturing
KW - lithium-ion batteries
KW - porous Si/Cu
KW - volumetric capacity
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U2 - 10.1021/acsami.0c16887
DO - 10.1021/acsami.0c16887
M3 - Article
C2 - 33259713
AN - SCOPUS:85097733803
VL - 12
SP - 57071
EP - 57078
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 51
ER -