MRI-like technique to detect what ails batteries-Ameya360 electronic components purchasing network

MRI-like technique to detect what ails batteries

Release time：2018-05-07

author：Ameya360

source：newelectronics

reading：1122

An MRI-based technique that can quickly diagnose what ails certain types of batteries – from determining how much charge remains, to detecting internal defects – without opening them up, has been developed by a team from New York University.

"The use of alternative energy and electrically powered vehicles will further increase the demand for better and safer batteries," observes Professor Alexej Jerschow, who led the research team. "However, there are currently only a limited set of tools available to diagnose a battery's health without destroying the battery. Our non-invasive technique offers a faster and more expansive method for making these assessments."

The researchers took inspiration from the MRI scan, which can produce images of the human body's organs in a non-invasive manner. They adopted a similar procedure where they measured tiny magnetic field changes surrounding the battery's electrochemical cells.

In their experiments, they examined Li-ion batteries in different states – various levels of charge and conditions (i.e. some damaged and others not). With these cells, the team say they were able to match magnetic field changes surrounding the batteries to different internal conditions, revealing state of charge and certain defects. These included bent and missing electrodes, as well as small foreign objects in the cell, which are flaws that can occur during the normal manufacturing process.

"With future enhancements to this method, it could provide a powerful means of predicting battery failures and battery lifetimes as well as facilitate the development of next-generation high-performance, high-capacity, and long-lasting or fast-charging batteries," concludes Prof. Jerschow.

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Paper biomass to build lithium-sulfur batteries

　　Researchers at Rensselaer have developed a patented method to use cheap and abundant paper biomass to make lithium-sulfur batteries.　　A major by-product in the papermaking industry is lignosulfonate – a sulfonated carbon waste material, which is typically combusted on site, releasing CO2 into the atmosphere after sulfur has been captured for reuse.　　Using this cheap and abundant paper biomass, a team of researchers from Rensselaer Polytechnic Institute said they can build a rechargeable lithium-sulfur battery.　　The team believe this could be used to power big data centres and provide a more affordable energy-storage option for microgrids and the electric grid.　　“Our research demonstrates the potential of using industrial paper-mill by-products to design sustainable, low-cost electrode materials for lithium-sulfur batteries,” said Trevor Simmons of Rensselaer.　　Sulfur is nonconductive, but when combined with carbon at elevated temperatures this changes, allowing it to be used in battery technologies. The challenge is that sulfur can easily dissolve into a battery’s electrolyte, causing the electrodes on either side to deteriorate after only a few cycles.　　The team explain that, so far, researchers have used different forms of carbon, like nanotubes and complex carbon foams, to confine the sulfur in place, but with limited success. “Our method provides a simple way to create an optimal sulfur-based cathode from a single raw material,” Simmons said.　　To develop their method, the Rensselaer researchers partnered with Finch Paper in Glens Falls, which provided the lignosulfonate. This ‘brown liquor’ was dried and heated to about 700°Cin a quartz tube furnace.　　The high heat drives off most of the sulfur gas, the team explained, but retains some of the sulfur as polysulfides that are embedded deep within an activated carbon matrix.　　The team repeated this process until the right amount of sulfur was trapped in the carbon matrix. The researchers then ground the material and mixed it with an inert polymer binder to create a cathode coating on aluminium foil.　　The research team said it has managed to create a lithium-sulfur battery prototype that is the size of a watch battery, which can cycle about 200 times. The next step is to scale up the prototype to markedly increase the discharge rate and the battery’s cycle life.

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