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Recyclable Phone Batteries Are Now A Reality

Recyclable Phone Batteries Are Now A Reality

Waste is Becoming an Increasingly Important Issue

The disposal of trash and waste is unsurprisingly a mess worldwide. Many problems exist within the structure of trash disposal, with recycling being often neglected in many areas, inconsistent and underdeveloped trash removal infrastructure, and the lack of any trash disposal facilities.

This means it’s relatively common worldwide to see actual rivers of trash.

A component of this issue that is growing daily is the increasing problem of electronic waste, otherwise known as e-waste. E-waste is the garbage created after electronic devices are thrown away after being used.

E-waste makes up anything electronic that goes into the landfill, and the reason this is so problematic because these devices often contain hazardous and toxic chemicals that eventually make their way into our land, water, and atmosphere.

Of the e-waste that is created, 10% of it is made up of cell phone batteries. This specific component of cell phones is increasingly a problem. Beyond the issues I described above, cell phones and other electronics are burned, releasing these dangerous chemicals and creating new ones.

However, many of these issues could be circumvented just by making easily recyclable phone batteries. This is how it could work.

Why Hasn’t This Been Done Already?

One of the major obstacles preventing cellphone batteries from being recycled commonly is that lithium-ion batteries are quite challenging to recycle or reuse.

However, there are many other ways to create cellphone batteries, and one of these ways could present itself as the way forward to create sustainable personal cellular devices.

The RMIT School of Engineering in Australia developed this new recyclable phone battery. The design primarily uses a material called Mxene, a material similar to graphene commonly used in electronics like traditional, not-so-recyclable phone batteries. The primary reason why Mxene isn’t already found in most cell phones is that it rusts easily, which hampers conductivity.

Compared to graphene or lithium-ion batteries, Mxene rusts much quicker, but this property ironically could be the very thing that extends the device’s life. Using sound waves to “brush” off the rust, the researchers estimate that they can extend a conventional phone battery’s life span by three times and create truly recyclable phone batteries.

Hossein Alijani, a Ph.D. student at the university and co-lead researcher of the project, said, “Current methods used to reduce oxidation rely on the chemical coating of the material, which limits the use of the MXene in its native form, in this work, we show that exposing an oxidized MXene film to high-frequency vibrations for just a minute removes the rust on the film. This simple procedure allows its electrical and electrochemical performance to be recovered.”

 

The Future is in Recycling

Reducing waste, period. It is one of the most critical issues facing us. However, in the meantime recycling the waste we are creating is the best solution to the massive amounts of garbage contaminating our planet.

As we continue to move into a world in which electronics play an increasingly important role in our daily lives, we must abandon the disposable electronic-use model. Creating easily removable and recyclable phone batteries is a challenge that is necessary for us to overcome.

With developments in technology like this becoming more common, we will soon see a world without contradiction between electronics and environmental sensitivity. As part of this movement, MXene recyclable phone batteries appear to be the latest and most promising solution to this problem that we have created.

 

 


 

 

Source Happy Eco News

Scientists develop A novel strategy for sustainable sodium & potassium batteries

Scientists develop A novel strategy for sustainable sodium & potassium batteries

Scientists astounded by performance of sustainable batteries with far-reaching implications for electric vehicles and devices.

Researchers at Bristol have developed high-performance sodium and potassium ion batteries using sustainably sourced cellulose.

Scientists at the Bristol Composites Institute have developed a novel controllable unidirectional ice-templating strategy which can tailor the electrochemical performances of next-generation post-lithium-ion batteries with sustainability and large-scale availability. The paper is published in the journal Advanced Functional Materials.

There is a rapidly increasing demand for sustainable, ethical and low-cost energy-storage. This is due in part to the drive towards developing battery-powered transport systems — mostly replacing petrol and diesel-based engines with electric vehicles — but also for hand-held devices such as mobile phones. Currently these technologies largely rely on lithium-ion batteries.

Batteries have two electrodes and a separator, with what is called an electrolyte between them which carries the charge. There are several problems associated with using lithium for these batteries, including build-up of the metal inside the devices which can lead to short circuits and overheating.

Alternatives to lithium, such as sodium and potassium batteries have not historically performed as well in terms of their rate performance and the ability to use them lots of times. This inferior performance is due to the larger sizes of sodium and potassium ions, and their ability to move through the porous carbon electrodes in the batteries.

Another issue associated with these batteries is they cannot be easily disposed of at end-of-life, as they use materials that are not sustainable. The cost of the materials is also a factor and there is a need to provide cheaper sources of stored energy.

Additionally, lithium is mined in countries such as Chile, Bolivia and Argentina. This mining is very destructive and there are poor human rights records associated with it.

Work at the University of Bristol in the Bristol Composites Institute, published in Advanced Functional Materials, and in collaboration with Imperial College, has developed some new carbon electrode materials based on an ice-templating system. These materials are called aerogels, where cellulose nanocrystals (a nano-sized form of cellulose) are formed into a porous structure using ice crystals that are grown and then sublimated. This leaves large channels within the structure that can carry the large sodium and potassium ions.

The performance of these new sodium and potassium ion batteries has been shown to outperform many other comparable systems, and it uses a sustainably sourced material — cellulose.

Corresponding author, Steve Eichhorn, Professor of Materials Science and Engineering at the University of Bristol and a world-leader in cellulose-based technologies, said: “We were astounded with the performance of these new batteries. There is great potential to develop these further and to produce larger scaled devices with the technology.”

Jing Wang, lead author and a PhD student in the Bristol Composites Institute, said: “We proposed a novel controllable ice-templating strategy to fabricate low-cost cellulose nanocrystals/polyethylene oxide-derived carbon aerogels with hierarchically tailored and vertically-aligned channels as electrode materials, which can be utilized to well-tuning the rate capability and cycling stability of sodium and potassium-ion batteries.

 

“Benefiting from the renewability of the precursor and scalability at relatively low cost in the environmentally benign synthesis process, this work could offer an appealing route to promote large-scale applications of sustainable electric vehicles and large-scale energy storage grids in the near future.”

 

Professor Eichhorn said: “In light of these findings, we now hope to collaborate with industries to develop this strategy on an industrial scale and to explore whether this unique technology can be easily extended to a variety of other energy storage systems such as zinc, calcium, aluminium and magnesium-ion batteries, thus demonstrating its universal potential in next-generation energy storage systems.”

Paper: “Ice-Templated, Sustainable Carbon Aerogels with Hierarchically Tailored Channels for Sodium- and Potassium-Ion Batteries,” by Wang, J; Xu, Z; Eloi, J; Titirici, M; & Eichhorn, S; in Advanced Functional Materials.

Courtesy of University of Bristol.

 


 

Source CleanTechnica