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A Yolk–Shell Structured Silicon Anode with Superior Conductivity and High Tap Density for Full Lithium‐Ion Batteries
Author(s) -
Zhang Lei,
Wang Chengrui,
Dou Yuhai,
Cheng Ningyan,
Cui Dandan,
Du Yi,
Liu Porun,
AlMamun Mohammad,
Zhang Shanqing,
Zhao Huijun
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201903709
Subject(s) - anode , materials science , chemical engineering , conductivity , cathode , carbon nanotube , composite number , lithium (medication) , nanoparticle , ion , nanotechnology , silicon , carbon fibers , electrode , composite material , chemistry , optoelectronics , organic chemistry , medicine , endocrinology , engineering
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.