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Japan's development of semi transparent lithium battery

Author: Source: Datetime: 2016-11-23 19:22:09

Laboratory trial professor of physics at the Faculty of engineering and advanced application principals, Institute of University of Japan Misaki Sato Hikarushi out with semi transparent lithium ion secondary battery two light charging function, and displayed in the exhibition "Innovation Japan 2015". Its goal is to achieve "smart window", will be almost transparent window directly into a large area of the battery, and so have solar power battery as a function, when the sunlight will make the color, the light transmittance decreased.

 semi transparent lithium battery

Misaki Sato's lab developed a semi transparent lithium ion battery two times in 2013, and published the relevant papers.


At that time, the positive electrode of the battery was used Li3Fe2 (PO4) 3 (LFP), the negative electrode using Li4Ti5O12 (LTO), and the use of six lithium fluoride phosphate (LiPF6) as the main component of the electrolyte. These are commonly used in lithium ion secondary battery two in the material, but the oxide basically is transparent, and the positive electrode thickness of only 80nm, the thickness of only 90nm, very thin, in order to achieve a high light transmittance.

For the green light with a wavelength of about 550nm, the light transmission rate is about 60% after discharge. Lithium concentration in the charging electrode changes, the electronic state of the material (valence) changes, when the green light transmission rate to about 30%.

The output voltage is about 3.6V. Charge discharge cycle life has been confirmed to be up to 20 times.

The Misaki Sato research office is on display in a new device that has not yet been published. The new device for the above semi transparent lithium ion two times the material slightly changed, can be injected into the negative light excitation of the electrons directly used for battery charging. It can be used in solar power generator.

In this exhibition, the Misaki Sato research office is open to the experimental results of the 5 light charging and discharging through the irradiation of near UV light (which is equivalent to about 1/10 of the sun's light), which is equivalent to about 10mW/cm2 of solar light.

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