To make lithium-ion batteries better, you will need to invent new resources, says Kristin Persson of UC Berkeley. – David Becker/Getty Images
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Batteries are definately not perfect. It seems like we’re constantly reaching for a cord to demand our phones or waiting by the energy cord, wishing our mobile phones would charge more rapidly. And that’s when we’re not concerned about the batteries in mobile phones exploding and getting fire.
But increasing battery technology isn’t only about making our devices go better. Batteries are important for renewable energy, electric cars and electrical grids. The problem is, the lithium-ion batteries that vitality our stuff don’t possess the capability to get far better. Marketplace Tech web host Molly Real wood talked with Kristin Persson, a professor of resources and engineering at University of California, Berkeley, who works on electric battery tech in a laboratory funded by the Section of Energy. Below can be an edited excerpt of their conversation.
Molly Wood: What sorts of things could better batteries vitality?
Kristin Persson: Firstly, you want to build out electrified transportation. We want more than only a few people to be driving electric cars. And you will also imagine service automobiles, such as your postman, driving electric vehicles. You often will also suppose we’d prefer to build out the electric grid. It needs modernization. It also should be able to use renewable strength sources to quite simply buffer the strength that’s getting into the grid. And you can get a little more fanciful …
Wood: Oh yeah, please do.
Persson: Well, in conditions of electrified flight, we’re starting to see a lot of interest in drones and compact airplanes appearing powered by batteries.
Wood: Wow. I don’t know why that sounds terrifying, nonetheless it sounds just a little terrifying. Maybe it’s simply new.
Persson: It’s new, and I think we’re going to need to rethink how we’re coping with it, yes. It’s clearly not simply about the technology, but also how exactly we put into action it and what we’re going to be able to do and how we’re going to do it.
Wood: And that gets to this sort of fundamental question about battery technology. What’s so hard about any of it? And what exactly are the barriers to it receiving good enough to power cities and airplanes and fleets of robots and factories?
Persson: So if you compare batteries to, for instance, computer systems, the difference is absolutely that in batteries you will need to invent new resources to make them better, whereas in semiconductors, you’re inherently, most of the time, using the same resources and you’re just building them smaller, which is easier.
Wood: What are those materials?
Persson: In a electric battery, if you are thinking lithium-ion electric battery, for instance, you have 3 highly optimized resources: two solid electrode resources and a liquid electrolyte. And each of these materials are highly useful in many various ways. They have various different real estate, such as how fast they transportation ions or how steady they will be or how great energy they are able to contain or store. So if you are going to do a better battery, you will need to come up, you will need to discover, a completely new material that has to do aswell and better on a few of those properties.
Wood: So you’re saying that at this time, all the real estate that make up a lithium-ion electric battery are at sort of max efficiency?
Persson: They’re not specifically at maximum, but they’re highly optimized. And you can’t possess a battery that is clearly a little bit better using one of these properties, but worse on something else. You’re not going to be ready to sacrifice, for example, a little bit higher strength density if it’s a lot less safe. They have to play nicely collectively. They can not react badly with each other in any ways.
Real wood: When you state they have to play well collectively, you mean not inflate?
Persson: Inflate, or there will be less catastrophic techniques are still detrimental. If the solid electrode reacts with the electrolyte in a way that a passivating film is definitely formed on the surface of the material, then your ions can’t get through and the electric battery shuts down.
Wood: After all, given the issue and given the hard wall structure that’s been hit in conditions of battery technology, do you feel that there’s going to must be some other energy source? Or do you believe that there will be a breakthrough eventually?
Persson: No, we’ll get it to work. There are many of very smart people working on this problem, and we will solve it. It will just take some time.