Iranian Researchers Produce Li-ion Battery for Brain Implant

Sunday, May 26, 2019 - 12:11

Researchers of Amirkabir University of Technology have designed and made a lithium-ion battery for powering brain implants.

According to an ISCA report, Mehran Javanbakht, executor of the research project and the faculty member of Amirkabir University of Technology Department of Chemistry, stated that the project, which is a part of the national project of designing and creating brain implant system, has been supported by Cognitive Sciences & Technologies Council.

Based on the research, recently, lithium-ion batteries (LIBs) have been developed for implantable devices where they must satisfy safety, reliability, high energy density, and low self-discharge.

Implantable products have lifetimes of up to 10 years or more. The used batteries need to be tested correctly and in a manner that simulates usage conditions. We need to be able to predict performance based on shorter-testing along with a fundamental understanding of the battery chemistry.

Developing safe cathode materials with desired electrochemical performance has recently been the main concern of either academic or industrial researchers. In this context, lithium manganese oxides have emerged as a promising alternative to conventional cathode materials due to the low cost, environmentally friendliness, high safety and high theoretical as well as practical specific capacity.

In this work for the first time, mesoporous LixMnO2cathode materials are synthesized using the one-potanodicor pulse electrode position through simultaneous electrode position and Li+incorporation into the host manganese dioxide.

The various contents of Li+ in LixMnO2samples have a tremendous impact on the ultimate material in terms of structural and physicochemical properties. The structural changes of host manganese dioxdie as a consequence of Li+ intercalation have been identified through the X-ray diffraction, inductively coupled plasma-optical emission spectroscopy, Fourier-transform infrared, thermogravimetric/ differential scanning calorimetry as well as Raman spectroscopy.

The results of nitrogen adsorption-desorption isotherms along with the scanning electron microscopy proved the mesoporous structure of electrode materials with a significantly high surface area. Among the LixMnO2materials, the Li0.21MnO2, shows the best electrochemical performance with the first discharge capacity of 283, 240, 191,161 and 113 mAhg-1 at 0.1 C, 0.2 C, 1 C, 2 C and 5 C, respectively, retaining 92% of the initial capacity over 50 cycles at 0.1 C.

The mesoporous Li0.41MnO2with a hierarchical morphology of nano-walls and a considerably high BET surface area of 137.49 m2g-1is also achieved via applying the optimized pulse electrode position parameters. The Li0.41MnO2shows superior performance as cathode material of LIBs delivering the first discharge capacity of 284.45 mAh g-1, retaining 94.22% of first discharge capacity after 250 charge-discharge cycles and is still able to deliver 204 mAh g-1after 110 successive charge-discharge cycles at different C-rates.

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