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A Yolk–Shell Structured Silicon Anode with Superior Conductivity and High Tap Density for Full Lithium‐Ion Batteries

Lei ZhangCentre for Clean Environment and Energy Gold Coast Campus Griffith University Queensland 4222 AustraliaChengrui WangCentre for Clean Environment and Energy Gold Coast Campus Griffith University Queensland 4222 AustraliaYuhai DouCentre for Clean Environment and Energy Gold Coast Campus Griffith University Queensland 4222 AustraliaNingyan ChengInstitute for Superconducting and Electronic Materials Innovation Campus University of Wollongong Wollongong NSW 2522 AustraliaDandan CuiInstitute for Superconducting and Electronic Materials Innovation Campus University of Wollongong Wollongong NSW 2522 AustraliaYi DuInstitute for Superconducting and Electronic Materials Innovation Campus University of Wollongong Wollongong NSW 2522 AustraliaPorun LiuCentre for Clean Environment and Energy Gold Coast Campus Griffith University Queensland 4222 AustraliaMohammad Al‐MamunCentre for Clean Environment and Energy Gold Coast Campus Griffith University Queensland 4222 AustraliaShanqing ZhangCentre for Clean Environment and Energy Gold Coast Campus Griffith University Queensland 4222 AustraliaHuijun ZhaoCentre for Clean Environment and Energy Gold Coast Campus Griffith University Queensland 4222 Australia

2019en

ABI

Annotatsiya

Abstract 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 SiO 2 outer shell to confine multiple Si NPs (yolks) and carbon nanotubes (CNTs) with embedded Fe 2 O 3 nanoparticles (NPs). The high tap density achieved and superior conductivity can be attributed to the efficiently utilised inner void containing multiple Si yolks, Fe 2 O 3 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 3.6 mAh cm −2 and 95 % reversible capacity retention after 450 cycles. The full cell constructed using a Li‐rich Li 2 V 2 O 5 cathode can achieve a high reversible capacity of 260 mAh g −1 after 300 cycles.

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Identifikatorlar

DOI: 10.1002/anie.201903709

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