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The molecular structure of the "perforated graphene molecule" developed this time
A research team consisting of Tohoku University and Tokyo University announced on May 14, 2016 that it has developed a new negative electrode material called "Perforated Graphene Molecules (CNAP)" for all-solid-state lithium batteries. This material can achieve a capacitance of more than 2 times that of a general-purpose graphite electrode, and it can maintain its original capacity after 65 times of charge and discharge.
For a long time, lithium battery cathode materials have been using light weight, large capacity graphite. Recently, graphene, carbon nanotubes, and other nanocarbons have emerged as new carbon materials on the market, making it possible to expand the battery capacity by 2-3 times. However, nano-carbon is not a complex mixture of structures, and it is impossible to unravel the principle and principle of large-capacity. Therefore, the development of molecular materials with partial nanocarbon structures has become the focus of attention.
The perforated graphene molecule developed this time is a macrocyclic organic molecule with nanoscale micropores in the center of the molecule. As a result of the production of a battery using this molecular solid material as an electrode and detection, it was confirmed that this molecule is an excellent electrode material. The focus of this study was to develop a new generation of highly anticipated batteries, namely all-solid-state batteries, which do not use liquid electrolytes used in conventional batteries, but use solid electrolytes. The use of complex hydrides with high lithium ion conductivity and stability as solid electrolytes creates opportunities for this new discovery.
All-solid-state lithium battery using a new negative molecular material and an electron microscope image thereof
New negative electrode molecular material motion pattern
In addition, this study also found that using the powder X-ray diffraction method, the perforated graphene molecule solids will form a layered structure similar to graphite, and can make the central molecules of micropores in a line, forming a fine, continuous micro Hole structure. In graphite, lithium accumulates only in the gaps of the stacked carbon layers, whereas in the perforated graphene molecules, lithium accumulates in both nano-sized gaps and micropores, and thus capacity can be expanded. Perforated graphene molecules can be produced using the very common, high yield organic compound "naphthalene."
The relevant results of this study were published in the international academic magazine “Small†on May 13 (Sino-European Summertime). The website "MaterialsViews.com," which publishes material science news, will also be introduced in the article. (Special Contributor: Kudosuke)
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