Jul
11
University of Texas researchers and Seoul National University have designed a new manganese and sodium ion based material that might replace many lithium ion batteries. The new chemistry offers a potentially lower-cost, more eco-friendly option to energize next generation devices and electric cars.
In the battle of the batteries, lithium-ion technology is the reigning champion, powering the cellphone in your pocket as well as an increasing number of electric vehicles on the road.
The sodium-ion design above, retains the high energy density of a lithium-ion cathode, replaces the most of the lithium atoms (green) with sodium (yellow). The layered structure of the new material also incorporates manganese (purple) and oxygen (red).
The team’s research paper has been published in the journal Advanced Materials.
Dr. Kyeongjae Cho, professor of materials science and engineering in the Erik Jonsson School of Engineering and Computer Science and senior author of a paper describing the new material in the journal explained battery cost is a substantial issue.
As manufacturers and consumers push for more electric vehicles (EVs), lithium production may have a hard time keeping up with increasing demand, Cho said. According to a recent report by the International Energy Agency, the global electric car stock surpassed 2 million vehicles in 2016 after crossing the 1 million mark in 2015. The report notes that, depending on the policy environment, there is a good chance that it will range between 9 million and 20 million by 2020 and between 40 million and 70 million by 2025.
In terms of cost savings in the EV battery, using sodium would be less expensive because sodium is more abundant, but it has some drawbacks.
Cho explained, “Lithium is a more expensive, limited resource that must be mined from just a few areas on the globe. There are no mining issues with sodium, it can be extracted from seawater. Unfortunately, although sodium-ion batteries might be less expensive than those using lithium, sodium tends to provide 20 percent lower energy density than lithium.” It is also a byproduct of other industries such as agriculture and petroleum.
The energy density, or energy storage capacity, of a battery determines the run time of a device.
“We used our previous experience and thought about these issues. how can we combine these ideas to come up with something new to solve the problem?” Cho said.
A battery consists of a positive electrode, or cathode; a negative electrode, or anode; and an electrolyte in between. In a standard lithium-ion battery, the cathode is made of lithium, cobalt, nickel and oxygen, while the anode is made of graphite, a type of carbon. When the battery charges, lithium ions move through the electrolyte to the anode and attach to the carbon. During discharge, the lithium ions move back to the cathode and provide electric energy to run devices.
“There was great hope several years ago in using manganese oxide in lithium-ion battery cathodes to increase capacity, but unfortunately, that combination becomes unstable,” Cho said.
In the design developed by Cho and his colleagues, sodium replaces most of the lithium in the cathode, and manganese is used instead of the more expensive and rarer elements cobalt and nickel.
“Our sodium-ion material is more stable, but it still maintains the high energy capacity of lithium,” Cho said. “And we believe this is scalable, which is the whole point of our research. We want to make the material in such a way that the process is compatible with commercial mass production.”
Based on their knowledge of the physics and chemistry of other experimental materials, the researchers attacked the problem with rational material design. They first ran computer simulations to determine the configuration of atoms that showed the most promise before making and testing the material in the lab.
Cho said his research is not just about coming up with a better battery. How the research was done is just as important and as interesting, he said.
Cho explained, “When Thomas Edison was trying to develop a light bulb, he tried thousands of different materials for the filament to see which ones worked. To solve very important engineering problems in society today, we need to develop lots of new materials – battery materials, pollution control materials and others. Edison was perfecting one item, the light bulb, but we have so many more technological needs. We don’t have time to keep trying to accidentally find the solution.”
Cho is right. And with each simulation run and tested the simulations get more refined. This technique is simply going to get better and better. For now though a lost cost alternative to lithium is going to become very important making this work quite welcome indeed.