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Achieving fully reversible conversion in Si anode for lithium-ion batteries by design of pomegranate-like Si@C structure.
- Source :
-
Electrochimica Acta . Sep2021, Vol. 389, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- • The pomegranate-like Si@C microspheres were successfully prepared with inexpensive AlSi alloy by surface modification, coating with resin, carbonization, and acid etching processes. • The distinctive pomegranate-like Si@C structure stabilizes the porous structure of Si particle and improves the electrochemical property. • As high as 84.98% ICE and 100% Coulombic efficiency were obtained for the sample (Si40@C3), which provide a helpful guide to synthesize the Si/C anode with high ICE and Coulombic efficiency and stable cycling. Si/C materials are considered as the most promising anodes for the next generation lithium ion batteries. However, the Si/C anodes with high Coulombic efficiency are still a challenge. Here, pomegranate-like Si@C microspheres are successfully prepared with inexpensive AlSi alloy by surface modification, coating with resin, carbonization and acid etching processes. As high as 84.98% initial Coulombic efficiency (ICE) and 100% Coulombic efficiency are obtained for the sample (Si 40 @C3), and the specific capacity still maintained over 620 mAh g−1 with capacity retention of 70.4% over 250 cycles. The excellent electrochemical performance could be attributed to the distinctive pomegranate-like Si@C structure, which either stabilizes the porous structure of Si particle by inhibiting the volume expansion and pulverization or improves the electrochemical property by the appropriate carbon coating layer. This would provide a helpful guide to synthesize the Si/C anode with high ICE and Coulombic efficiency and stable cycling. [ABSTRACT FROM AUTHOR]
- Subjects :
- *LITHIUM-ion batteries
*ANODES
*ALLOY powders
Subjects
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 389
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 151685023
- Full Text :
- https://doi.org/10.1016/j.electacta.2021.138736