Binder-free freestanding flexible Si nanoparticle–multi-walled carbon nanotube composite paper anodes for high energy Li-ion batteries

Si nanoparticles and multi-walled carbon nanotubes (MWNTs) were combined using the simple, inexpensive, and scalable approach involving ultrasonication and positive-pressure filtration to generate binder-free freestanding flexible Si–MWNT (Si–MW) composite paper anodes for Li-ion batteries. Through...

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Bibliographic Details
Published inJournal of materials research Vol. 33; no. 4; pp. 482 - 494
Main Authors Yao, Kang, Zheng, Jim P., Liang, Zhiyong
Format Journal Article
LanguageEnglish
Published New York, USA Cambridge University Press 28.02.2018
Springer International Publishing
Springer Nature B.V
Subjects
Anodes
Applied and Technical Physics
Biomaterials
Carbon
Chemical vapor deposition
Composite materials
Electric cells
Electrodes
Electrolytes
Electrolytic cells
Energy
Engineering schools
Flux density
Graphene
Graphite
Inorganic Chemistry
Lithium
Lithium-ion batteries
Materials Engineering
Materials research
Materials Science
Multi wall carbon nanotubes
Nanoparticles
Nanotechnology
Pressure filtration
Rechargeable batteries
Silicon
Slurries
Spectrum analysis
Surfactants
Thin films
University colleges
Florida
United States > US
Massachusetts
energy storage
Li
Si
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Summary:Si nanoparticles and multi-walled carbon nanotubes (MWNTs) were combined using the simple, inexpensive, and scalable approach involving ultrasonication and positive-pressure filtration to generate binder-free freestanding flexible Si–MWNT (Si–MW) composite paper anodes for Li-ion batteries. Through controlling the Si/carbon nanotube (CNT) weight ratio, the composite with 3:2 Si/CNT ratio exhibited the optimal balance between the high capacity of SiNPs and high conductivity and structural stabilization quality of MWNTs, leading to high rate capability as well as specific capacity and cyclability surpassing the conventional slurry-cast SiNP electrode using binder and current collector and other complicated freestanding Si/carbon composite designs. After 100 cycles, our electrode retained a capacity of 1170 mA h/g at 100 mA/g and 750 mA h/g at 500 mA/g. Moreover, a different electrolyte composition enabled a reversible capacity of 1300 mA h/g at 100 mA/g after 100 cycles. The freestanding feature of our electrodes is promising for enhanced energy density of Li-ion cells.
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ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2017.475