Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 26, Pages 8824-8828Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201903709
Keywords
carbon nanotube networks; lithium-ion batteries; silicon; tap density; yolk-shell structure
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Funding
- Australian Research Council Discovery Project [DP180103430]
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The poor cycling stability resulting from the large volume expansion caused by lithiation is a critical issue for Si-based anodes. Herein, we report for the first time of a new yolk-shell structured high tap density composite made of a carbon-coated rigid SiO2 outer shell to confine multiple Si NPs (yolks) and carbon nanotubes (CNTs) with embedded Fe2O3 nanoparticles (NPs). The high tap density achieved and superior conductivity can be attributed to the efficiently utilised inner void containing multiple Si yolks, Fe2O3 NPs, and CNTs Li+ storage materials, and the bridged spaces between the inner Si yolks and outer shell through a conductive CNTs highway. Half cells can achieve a high area capacity of 3.6mAhcm(-2) and 95% reversible capacity retention after 450cycles. The full cell constructed using a Li-rich Li2V2O5 cathode can achieve a high reversible capacity of 260mAhg(-1) after 300cycles.
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