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Home> Articles>News>Rechargeable and Safe Lithium Batteries Become Realistic

Rechargeable and Safe Lithium Batteries Become Realistic

From:CTECHI GROUP Limited     Release time:2018-09-14

Overview:Batteries with higher energy density capacity than "high energy density lithium ion battery" used in laptops, pads and smartphones. Lithium battery has not been widely used so far because it has a problem of safety due to short circuiting when made in a rechargeable form. But, Cornell University seems that the research team finally has solved this problem.

Batteries with higher energy density capacity than "high energy density lithium ion battery" used in laptops, pads and smartphones. Lithium battery has not been widely used so far because it has a problem of safety due to short circuiting when made in a rechargeable form. But, Cornell University seems that the research team finally has solved this problem.

A lithium metal oxide, A secondary battery (rechargeable battery) using carbon which occludes lithium in the negative electrode is "Lithium ion battery". It is widely used for laptops, pad, smart phones, hybrid vehicles, airplanes, etc. And the use of fluorinated graphite and lithium thionyl chloride battery for the positive electrode is "Lithium battery".

When aa size rechargeable lithium battery is repeatedly charged, the lithium can be interposed between the positive electrode and the negative electrode. So there is a possible danger of short-circuiting, even if it is used as a primary battery that is not chargeable. Although there are lithium batteries that are rechargeable like these, these are made mainly by a ceramic separator so that dendrite does not short-circuit the positive electrode and the negative electrode.

High Energy Density Lithium Ion Battery

Professor Linden Archer and his team led by graduate student Snnahasse Chodory have find ways to suppress the growth of dendrite between the positive and negative poles. What is used is not a ceramic separator but a polymer membrane made with polyethylene oxide crosslinked with poly (propylene oxide) and silicon dioxide. The membrane is perforated, and ions do not pass through the dendrite even though it passes through it. Using the membrane produced this time, it seems that it becomes possible to maintain good conductivity even at room temperature.

A wonderful thing about this "discovery" is that they don't need to fundamentally change the battery technology. As a lithium ion battery also uses a polymer membrane as a separator, the membrane produced this time can be incorporated into various batteries. Furthermore, it may be possible to apply other metals that are limited in application by dendrite like lithium and lithium like sodium and aluminum.


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