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Volume 8 Journal of Fundamentals of Renewable Energy and Applications
ISSN: 2090-4541 Battery Tech 2018
September 10-11, 2018
September 10-11, 2018 | London, UK
3rd International Conference on
Battery and Fuel Cell Technology
Lattice elastic and plastic deformation restoring stability in silicon carbide film anode of secondary
lithium battery
Zhang Hongtao1, Pan Jian 1, Liuxin1, Xu Hui1 and Zhang Zesen2
1Hubei University of Technology, China
2Wuhan Chuneng electron Co. Ltd., China
In charge and discharge process of lithium ion battery special elastic and plastic deformation could be experienced with
lithium intercalation and extraction in anode, which is a mechanical behavior. Silicon carbide has many polytypes, such
as cubic symmetry, four hetero-structure, six hetero-structure, fifteen hetero-structure, etc., which is a solid with a compact
structure. Normally, the lithium ion migration in its crystal could be impeded because of its strong covalent bond. Bulk silicon
carbide is unable to store up lithium ion. Nanosized crystalline of silicon carbide could alternatively be a different situation.
There could be a lot of surface defects and inner defects, the silicon carbide nanomaterials would produce the lithium ion
migrating path. In nanocrystalline films of silicon carbide the nanocolumnar silicon carbide would be a dangling bond
nanocrystal on surface with a great deal of defects, in which they are discrete distribution in the film of anode surrounded by
the amorphous crystalline silicon carbide. The nanocrystalline columnar silicon carbide in film could supply the conducting
pass due to its crystal structure defects. But its conductivity will not be large enough to make the lithium ion effectively move.
It needs doping, especially nitrogen doping, which was in favor of forming high concentration nitrogen vacancy, to enhance
its conductivity. The lithium ion migration in silicon carbide nanocrystalline would put up its lattice structure and configure
six lithium atoms per silicon, which could realize the non-stoichiometric proportions of lithium ion. The crystal lattice would
recovery its previous state while lithium ion extraction. The transversion of charge and discharge in lithium ion battery will
repeat. The crystal lattice would attempt to recovery its original state, and the process would cycle repeatedly, and so on. It
could need a proper indicator to describe the phenomena; we will use a word, which is the stability of elastic and plastic
deformation restoring force. It would be related to the lithium ion diffusion, electron conduct, spatial distribution of lithium
alloy, nanocrystalline size, and its dimension, diffusion coefficient. We could reduce a formula of the stability of elastic and
plastic deformation restoring force
R- the ratio of minimum and maximum value of nanocrystalline size, I-the strength of chemical bond, which could be
computed by the bond breaking, E- lattice energy, ∆V-volume change ration , n-dimension, which would take the value 1
while zero dimension, the value 2 while one dimension, 1.5 while 2 dimension, and 0.5 while 3 dimension. The anode materials
would divide into three types, i.e., stable, meta-stable, and unstable type. H could take the value H≥15, 1≤H< 15, H<1. The H
of silicon carbide would be 20, it is stable.
Biography
Zhang Hongtao is a Professor in the Department of Communication Engineering, Hubei University of Technology, China. He is mainly engaged in quantum computing and
quantum information, embedded systems development research and also have interest in battery and electric vehicles.
Zhang Hongtao et al., J Fundam Renewable Energy Appl 2018, Volume 8
DOI: 10.4172/2090-4541-C5-062