Silicon (Si) is widely viewed as a potential negative electrode material for the next generation of high energy density, rechargeable Li ion batteries. Although Si has a large specific capacity, it generally suffers from poor cycling stability because of mechanical degradation. The large volume expansion that occurs during lithiation is a key problem here. These large volume changes induce cracking and the loss of electrical contact with the current collector. To investigate strategies for engineering architectures that can better accommodate this expansion, we designed an electrochemical cell that enables us to investigate the stress evolution with different states of charge during lithium insertion and removal. These in situ stress measurements revealed that during lithiation cycles, Si films expand and develop compressive stresses which on further lithium insertion forces Si to flow. During delithiation, these films then contract and eventually exhibit tensile stress. To mitigate such mechanical degradation due to these stresses, we investigated this effect in arrays of patterned Si islands that were fabricated using through mask magnetron sputtering.
Product Identifiers
Publisher
Lap Lambert Academic Publishing
ISBN-13
9783659157158
eBay Product ID (ePID)
138723415
Product Key Features
Author
Sumit Kumar Soni
Publication Name
Electrochemically Driven Compositional Stresses in Lithiated Si Films
Format
Paperback
Language
English
Subject
Engineering & Technology
Publication Year
2012
Type
Textbook
Number of Pages
168 Pages
Dimensions
Item Height
229mm
Item Width
152mm
Item Weight
254g
Additional Product Features
Title_Author
Sumit Kumar Soni
Country/Region of Manufacture
Germany
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