期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 168, 期 2, 页码 -出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/abdd7e
关键词
Batteries Li-ion; Silicon; swarf; Nanoscale materials; carbon; graphite sheet
资金
- JKA
- KEIRIN RACE, and Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials, from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) in Japan
Composite electrodes using flake-shaped Si nanopowder from swarf treated as industrial waste and ultrathin graphite sheets demonstrate better cycling performance and delithiation capacities compared to C-coated Si electrodes, attributed to the formation of GS bridges and stable frameworks.
Composites of flake-shaped Si nanopowder from swarf treated as an industrial waste and ultrathin graphite sheets (GSs) (Si:C = 5:1 wt) are used in Li-ion battery electrodes. Si nanopowder is dispersed and wrapped between GSs fabricated from expanded graphite. The delithiation capacity of the Si/GS composite electrode during 300 cycles is 1.69 similar to 0.83 mAh cm(-2) (0.5 C), while that of the electrode with C-coated Si nanopowder (Si:C = 10:1 wt) fabricated in C2H4 is 1.55 similar to 0.72 mAh cm(-2). The series resistances (R-s) for the Si/GS electrode are a half and two-thirds of those for the C-coated Si electrode at the 6th and 300th cycles, respectively. The charge transfer resistance (R-ct) for the Si/GS electrode is two-thirds of that for the C-coated Si electrode at the 300th cycle. GS bridges are formed across cracks, and suppress cracking and peeling-off of Si. Agglomerated GSs wrap Si/GS composites, and work as stable frameworks that secure electrolyte paths and buffer spaces for Si volume change. In the C-coated Si electrodes, Si frameworks fuse after the 300th cycle, leading to low delithiation capacities. The delithiation capacity of 4 mAh cm(-2) for more than 75 cycles is achieved by the Si/GS electrode at the current density of 5 mA cm(-2) with delithiation limitation at 1200 mAh g(-1).
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