Lithium-ion batteries are the ultimate benchmark when it comes to mobile phones, tablet devices, and electric cars. Their storage capacity and power density are far superior to other rechargeable battery systems. Despite all the progress that has been made, however, smartphone batteries only last a day and electric cars need hours to be recharged. Scientists are therefore working on ways to improve the power densities and charging rates of all-round batteries.
“An important factor is the anode material,” explains Dina Fattakhova-Rohlfing from the Institute of Energy and Climate Research (IEK-1).
“In principle, anodes based on tin dioxide can achieve much higher specific capacities, and therefore store more energy, than the carbon anodes currently being used. They have the ability to absorb more lithium ions,” says Fattakhova-Rohlfing. “Pure tin oxide, however, exhibits very weak cycle stability – the storage capability of the batteries steadily decreases and they can only be recharged a few times. The volume of the anode changes with each charging and discharging cycle, which leads to it crumbling.”
One way of addressing this problem is hybrid materials or nanocomposites – composite materials that contain nanoparticles. The scientists developed a material comprising tin oxide nanoparticles enriched with antimony, on a base layer of graphene (“Making Ultrafast High-Capacity Anodes for Lithium-Ion Batteries via Antimony Doping of Nanosized Tin Oxide/Graphene Composites“).
The graphene basis aids the structural stability and conductivity of the material. The tin oxide particles are less than three nanometres in size and are directly “grown” on the graphene. The small size of the particle and its good contact with the graphene layer also improves its tolerance to volume changes – the lithium cell becomes more stable and lasts longer.
Image Credit: Prof. Dina Fattakhova-Rohlfing
News This Week
From Frontiers Forum: How can research translate to R&D? Or a whole new business venture? In a panel session at Science Unlimited 2019, Holtzbrinck Publishing Group CEO Stefan von Holtzbrinck, Life Biosciences CEO [...]
More and more security holes are appearing in cryptocurrency and smart contract platforms, and some are fundamental to the way they were built. Early last month, the security team at Coinbase noticed something strange [...]
“The most crucial result of this work is the correlation between form and function in supercapacitor materials,” states first author Dina Ibrahim Abouelamaiem. She elaborates that “our research is driven by the need for [...]
“We’ll have nanobots that… connect our neocortex to a synthetic neocortex in the cloud. Our thinking will be a…. biological and non-biological hybrid.” Ray Kurzweil, TED 2014 UPDATE - June 18 2019 Since [...]
A new study by the Environmental Working Group reveals that: “Major food companies like General Mills continue to sell popular children’s breakfast cereals and other foods contaminated with troubling levels of glyphosate, the cancer-causing [...]
A nanotechnology treatment derived from bone marrow stem cells has reversed multiple sclerosis symptoms in mice and could eventually be used to help humans, according to a new study led by University of California, [...]
In a paper published this week in Nature ("Freestanding crystalline oxide perovskites down to the monolayer limit"), materials science researchers at the University of California, Irvine and other institutions unveil a new process for [...]