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High-Strength Nanotwinned Copper Combined with Silicon/Silicon Nitride/Graphite Anode for High-Performance Lithium-Ion Battery
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DOI：10.3390/ma19122496.png)
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Abstract
En 中文
Graphite is widely used as an anode in lithium-ion batteries (LIBs); however, its limited capacity restricts the energy density enhancement. Si-based anodes offer much higher capacity, but their significant volume changes during repeated lithiation and delithiation generate mechanical stress and can damage the electrode/current-collector interface. Herein, high-strength nanotwinned Cu (NT-Cu) was fabricated and employed as current collectors for carbon-coated Si/β-Si3N4-based anodes. The electroplated 5 μm-thick NT-Cu foils exhibited tensile strength exceeding 760 MPa. The role of the Cu current collector was investigated by comparing NT-Cu foils with different mechanical properties and commercial Cu foils. The results show that electrochemical performance was not governed by UTS alone; instead, a balanced combination of tensile strength, ductility, and surface morphology was important for improving cycling stability and rate capability. To further improve cycling retention, artificial graphite was incorporated into the Si/β-Si3N4 composite. Using a 5 μm electroplated NT-Cu foil and a Si/β-Si3N4/artificial graphite composite anode, the pouch cell retained 81.51% of its capacity and delivered 267.3 mAh g−1 after 206 cycles. These results demonstrate the potential of NT-Cu for improving the stability of Si-containing LIB anodes.
Keywords:
artificial graphite
copper foil
high-rate retention
lithium-ion battery
mechanical properties
silicon nitride
Journal
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3.2
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5.6W
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15.1W