Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7924159 | Materials Science and Engineering: B | 2018 | 8 Pages |
Abstract
Crystalline micro-sized Si wafer sawing chips recycled from the waste slurry are modified to be practical anode materials by designated pyrolytic coatings using Poly(ether ether ketone) (PEEK) as the precursor. Si-C composite particles are obtained at different pyrolysis temperatures (500-800â¯Â°C), covering different stages of polymer degradation in PEEK. The Si-C anodes obtained at a suitable pyrolysis temperature exhibit an initial capacity greater than 2000â¯mAhgâ1 and less than 10% of initial irreversible capacity at 0.1â¯C. The Si-C anode exhibits a reversible capacity of 960â¯mAhgâ1 with capacity retention of â¼90% over 50 cycles at 1â¯C. The designated pyrolytic coating provides a buffer layer, which serves as a conductive pathway as well as a durable surface cap to accommodate the huge volume change during lithiation and de-lithiation of Si. These originally unusable Si particles are modified into practical Si-C composites with enhanced capacity and cycling stability.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Kuo-Feng Chiu, Ponien Lai,