Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 49, Pages 27234-27241Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b08401
Keywords
lithium ion battery; silicon anodes; electrospinning; rigid conductive sheath; high charging rate capability
Funding
- National Research Foundation of Korea - Korean government (MSIP) [NRF-2010-0028971, 2012R1A3A2026417]
- National Research Foundation of Korea [2012R1A3A2026417] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We report novel salami-like core sheath composites consisting of Si nanoparticle assemblies coated with indium tin oxide (ITO) sheath layers that are synthesized via coelectrospinning. Core sheath structured Si nanoparticles (NPs) in static ITO allow robust microstructures to accommodate for mechanical stress induced by the repeated cyclical volume changes of Si NPs. Conductive ITO sheaths can provide bulk conduction paths for electrons. Distinct Si NP-based core structures, in which the ITO phase coexists uniformly with electrochemically active Si NPs, are capable of facilitating rapid charge transfer as well. These engineered composites enabled the production of high-performance anodes with an excellent capacity retention of 95.5% (677 and 1523 mAh g(-1)' which are based on the total weight of Si-ITO fibers and Si NPs only, respectively), and an outstanding rate capability with a retention of 75.3% from 1 to 12 C. The cycling performance and rate capability of core-sheath-structured Si NP-ITO are characterized in terms of charge-transfer kinetics.
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