Showing posts with label lithium ion batteries. Show all posts
Showing posts with label lithium ion batteries. Show all posts

Wednesday, 29 March 2017

Looking for the Next Boost in Rechargeable Batteries

An Alteration to Lithium-Sulfur Battery

The USC researchers have come up with a solution for rechargeable batteries. In the January issue of the Journal of the Electrochemical Society, which had been published by Sri Narayan and Derek Moy of the USC Loker Hydrocarbon Research Institute, outlines how they had designed a modification to the lithium-sulfur battery which could be more competitive with the industry standard lithium-ion battery.

The lithium sulphur batter which was presumed to be better in energy storage ability than the well=known lithium-ion counterpart had been vulnerable due to its short life span. The lithium=sulphur battery, presently can be recharged 50 to 100 times, unreasonable as an alternative energy source in comparison to 1,000 times, for several rechargeable batteries in the present day market.

The solution planned by Narayan together with lead author and research assistant Moy is what they call the `Mixed Conduction Membrane’, or MCM. This is a small piece of non-porous invented material inserted between two layers of porous separators, soaked in electrolytes which are placed in the midst of two electrodes.

MCM – Essential Movement of Lithium ions

The membrane acts as a block in decreasing the transporting of dissolved polysulfides among anode and cathode. This is a process which tends to increase the type of cycle strain makes use of lithium-sulfur batteries for the purpose of energy storage an experiment.

The MCM enables the essential movement of lithium ions, imitating the procedure as it takes place in lithium-ion batteries. This innovative membrane solution tends to preserve the high-discharge rate ability together with energy density without losing the capacity over a period of time. The researchers had discovered that the lithium-sulfur batteries which have a tendency to make use of MCM at several rates of discharge, had led to 100% capacity retention and had around four times longer life in comparison to batteries without the membrane.

According to Narayan, senior author and professor of chemistry at the USC Dornsife College of Letters, Arts and Science had stated that this progress removes one of the major technical barriers to the commercialization of the lithium-sulfur battery, enabling them to realize improved options for energy efficiency.

Lithium-Sulfur Batteries/Lithium-ion Batteries

It is said that lithium-sulfur batteries tends to have a lot of advantage over lithium-ion batteries and are made with plenty and cheap sulphur. They are two to three times denser making them both smaller and better at storing charge.

According to researchers, lithium-sulfur battery could be appropriate in saving space in mobile phones as well as computers. Moreover, it would also reduce weight in the forthcoming electric vehicles inclusive of cars, together with planes thereby further reduction in reliance on fossil fuels. The real MCM layer developed by Narayan and Moy is said to be a thin film of lithiated cobalt oxide but future alternate materials may produce much improved effects.

Any alternative material utilised as an MCM, according to Narayan and Moy should satisfy some vitalstandards. The material should be non-porous and should have mixed conduction properties and it should be electrochemically inactive.The research had been financed by USC together with the Loker Hydrocarbon Research Institute.

Monday, 22 June 2015

Kirigami-Based Stretchable Lithium-Ion Batteries

Battery Created on Origami variant Kirigami

Researchers at the Arizona StateUniversity have developed a battery which can stretch up to around 150%, giving rise to a wide range of potential applications in wearable technology. Created on the origami variant kirigami, the team was capable of transforming a larger battery into various smaller one through chains of folds and cuts.

Associate professor Hanqing Jiang in the School of Engineering of Matter, Transport and Energy, one of ASU’s Ira A, Fulton Schools of Engineering, together with the researchers created the battery utilising slurries of graphite and lithium cobalt dioxide, then coating them on sheets of aluminium foil making positive and negative electrodes, from which they added bends and cuts to begin the patterns. The outcome was a battery that could stretch while still maintaining full functionality.

 The team has stated that regardless of using origami as inspiration by the engineers for foldable batteries which can flex in the past, it marks the first time that a lithium-ion battery has been made stretchable. To test the efficiency of the battery, the kirigami-driven prototype battery, was sewn in an elastic wristband that was attached to a Samsung Gear 2 smartwatch. As the strap was stretched in various ways, the battery was capable of providing power to the watch for its functions inclusive of playing video.

Replace Bulky & Rigid Batteries

Jiang had commented that `this type of battery could potentially be used to replace the bulky and rigid batteries that are limiting the development of compact wearable electronic devices and this type of stretchable batteries could be integrated into fabrics, which include those used for clothing’.In the research journal Scientific Reports, a paper was published on June 11, describing how the team had developed kirigami based lithium-ion batteries with the use of a combination of folds and cuts creating patterns which permitted a significant increase in stretch-ability.

Hongyu Yu, an associate professor in the School of Electrical, Computer and Energy Engineering and the School of Earth and Space Exploration; Zeming Song, a material science doctoral student and Xu Wang, a mechanical engineering doctoral student, are some of the leading members of his ASU research team. Song and Wang have been praised by Jiang for utilising several kirigami patterns and for conducting experiments as well as characterising the properties of the materials that have been utilised in the development of the technology.

In-Depth View in Progress & Obstacles – Origami-Based Lithium-Ion Batteries

Others who have also made their contributions comprise of ASU engineering graduate students Change LV. Yonghao An, Mengbing Liang, Teng Ma and David He, a Pheonix high school student together with Ying-Jie Zheng and Shi-Qing Huang from the MOE Key Lab of Disaster Forecast and Control in engineering at Jinan University, Guangzhou, China.

Jiang together with some of his research team members as well as other colleagues, in an earlier paper in the research journal of Nature Communication, had provided an in-depth view in the progress and obstacles in the development of origami-based lithium-ion batteries where the paper clarified technical challenges in flexible battery progress which Jiang states that the teams’ kirigami based devices are helping to solving.

Friday, 27 January 2012

Laboratories: looks like the high-tech of the future - V

Music from blocks

Researchers at Southampton University have created a new way to generate computer music. This software, audio d-touch, works with a computer and a webcam. By using simple techniques of computer vision, physical blocks are drawn on a printed circuit. The position of the block then determines how the computer samples and reproduced the sound.