This article published in the Science and Technology of Advanced Materials reports an approach with industrial potential to produce nano-sized composite silicon-based powders as negative electrodes for the next generation lithium ion batteries.
The lithium ion battery market has been growing steadily and has been seeking an approach to increase battery capacity while retaining its capacity for long recharging process.
Structuring materials for electrode at the nanometre-length scale has been known to be an effective way to meet this demand; however, such nanomaterials would essentially need to be produced by high throughput processing in order to transfer these technologies to industry.
This article published in the Science and Technology of Advanced Materials reports an approach which potentially has an industrially compatible high throughputs to produce nano-sized composite silicon-based powders as a strong candidate for the negative electrode of the next generation high density lithium ion batteries.
The authors have successfully produced nanocomposite SiO powders by plasma spray physical vapor deposition  using low cost metallurgical grade powders at high throughputs. Using this method, they demonstrated an explicit improvement in the battery capacity cycle performance with these powders as electrode.
The uniqueness of this processing method is that nanosized SiO composites are produced instantaneously through the evaporation and subsequent co-condensation of the powder feedstock. The approach is called plasma spray physical vapor deposition (PS-PVD).
The composites are 20 nm particles, which are composed of a crystalline Si core and SiOx shell. Furthermore, the addition of methane (CH4) promotes the reduction of SiO and results in the decreased SiO-shell thickness. The core-shell structure is formed in a single-step continuous processing.
As a result, the irreversible capacity was effectively decreased, and half-cell batteries made of PS-PVD powders have exhibited improved initial efficiency and maintenance of capacity as high as 1000 mAhg−1 after 100 cycles at the same time.
Keiichiro Homma, Makoto Kambara, Toyonobu Yoshida: Sci. Technol. Adv. Mater. 15 (2014) 025006. http://dx.doi.org/10.1088/1468-6996/15/2/025006
 See, for instance, figures 1 and 3., J. Appl. Phys. 115, 143302 (2014); doi: 10.1063/1.4870600
For more information, contact
Dr. Makoto Kambara
Dept. Materials Engineering
The University of Tokyo
3-D-printed structures 'remember' their shapes
29.08.2016 | Massachusetts Institute of Technology
Crystal unclear: Why might this uncanny crystal change laser design?
29.08.2016 | National Institute of Standards and Technology (NIST)
Scientists and engineers striving to create the next machine-age marvel--whether it be a more aerodynamic rocket, a faster race car, or a higher-efficiency jet...
Waveguides are widely used for filtering, confining, guiding, coupling or splitting beams of visible light. However, creating waveguides that could do the same for X-rays has posed tremendous challenges in fabrication, so they are still only in an early stage of development.
In the latest issue of Acta Crystallographica Section A: Foundations and Advances , Sarah Hoffmann-Urlaub and Tim Salditt report the fabrication and testing of...
Electrochemists at TU Graz have managed to use monocrystalline semiconductor silicon as an active storage electrode in lithium batteries. This enables an integrated power supply to be made for microchips with a rechargeable battery.
Small electrical gadgets, such as mobile phones, tablets or notebooks, are indispensable accompaniments of everyday life. Integrated circuits in the interiors...
Recent findings indicating the possible discovery of a previously unknown subatomic particle may be evidence of a fifth fundamental force of nature, according...
A nanocrystalline material that rapidly makes white light out of blue light has been developed by KAUST researchers.
25.08.2016 | Event News
24.08.2016 | Event News
12.08.2016 | Event News
30.08.2016 | Ecology, The Environment and Conservation
30.08.2016 | Power and Electrical Engineering
30.08.2016 | Life Sciences