Abstract
A patterned film (electrode) with lozenge-shaped Si tiles could be successfully fabricated by masking with an expanded metal foil during film deposition. Its electrochemical properties and structural stability during the charge-discharge process were examined and compared with those of a continuous (conventional) film electrode. The patterned electrode exhibited a remarkably improved cycleability (75% capacity retention after 120 cycles) and an enhanced structural stability compared to the continuous electrode. The good electrochemical performance of the patterned electrode was attributed to the space between Si tiles that acted as a buffer against the volume change of the Si electrode.
Highlights
The secondary Li-ion batteries with a high energy density have gained attention from wide-range applications of power source for the portable electronics, electric vehicle, and electric storage reservoir
The width [w] and height [h] of the Si tile are about 700 μm and 270 μm, respectively, and the Si-deposited area ratio of the patterned film is about 83% for the continuous film. These results demonstrate that a well-patterned Si film can be fabricated by masking with an expanded metal foil
A patterned Si film with lozenge-shaped tiles could be successfully fabricated by masking with an expanded metal foil, and its electrochemical properties were compared with those of a continuous film electrode
Summary
The secondary Li-ion batteries with a high energy density have gained attention from wide-range applications of power source for the portable electronics, electric vehicle, and electric storage reservoir. There is a severe practical problem in the application of Si electrodes, i.e., when Si is used as an anode material for Li-ion batteries, a large volume expansion/shrinkage occurs during the charge-discharge (lithiation-delithiation) process. For a patterned Si film, the space between the patterned Si film units makes room to expand the volume of Si during the lithiation process and to minimize the stress generated in the Si film electrode. These characteristics of the patterned Si film are expected to minimize the structural damage of the Si film and improve the electrochemical reversibility of the electrode. Electrochemical measurements were preformed in CR2032 coin cells with the different Si film electrodes
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