Every argument clarity score on this site is built from rows on this page. Each
question and answer was assessed with names hidden, the host's own answers included, on
four things from 1 to 5:
directness (does it answer the question asked), coherence (do the ideas follow),
precision (concrete details and clear references), compression (says a lot per word). The weighted
mix (30/30/25/15) is the exchange score. A person's published score averages their exchange
scores on raw tape only, at least 8 of them, shrunk toward the cohort mean.
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Answered raw tape
D 5 · C 5 · P 5 · Cm 4 4.85
Q So what was, what was it like working on like the first, this is the first massive lithium ion mass produced batteries for, for, for automobiles that you guys, like what do you have to do to, to achieve that?
A So there's a ton of skepticism, right? The, the auto industry basically looked at it and said, look, there's, you can't use laptop batteries to make cars. That's just dumb. It's never going to work. Uh, it's unsafe. You've got 7000 of them. All those connections are going to fail. So there's a huge amount of skepticism that we heard all around. But it was sort of one problem at a time, and you don't know, you know, as a young engineer, you don't know any better that, that something's not supposed to be doable, and you just figure it out. So the key issues were, how do you connect 7000 cells together? Um, some of the, some, you know, the wire bonding you saw is a big part of it. Um, uh, six, uh, 99 groups in series, 69 in parallel. Um, and the, so that was a big challenge. The other big challenge was really safety. So, so batteries, Can develop defects. They can go into thermal runaway. And one of the big things we solved is that if that happens, you know, in one battery, that it not propagate to the rest. So, so if one, if one happens to have a defect, uh, that causes a failure, if it, if it propagates, you have a problem. And if it doesn't, you have an inherently safe system. And so we were able to make an inherently safe system with a lot of thermal, thermal, um, challenges in order to make that work.
AI assessment note: “So the key issues were, how do you connect 7000 cells together?”
Answered raw tape
D 5 · C 5 · P 5 · Cm 4 4.85
Q And just, and just to go a little bit deeper, just for people who are interested, Like, like what are the bonds that are storing the energy? Is it like lithium and it's not, it's not interacting with the silicon or is it, or what's going on there?
A So in conventional batteries on the, it's, uh, it's the, the atomic, uh, structures, essentially six carbon atoms and one silicon, uh, lithium atom sitting in the middle. Uh, and so it's, uh, LIC six is the chemical kind of how it compounds. And then in the cathode, it's, uh, it's a metal oxide in your phone. It's a lithium cobalt oxide. So Li, cobalt CO, uh, oxygen O two. Uh, and so that's a crystal structure. And again, the lithium atom kind of sits in the middle or in some part of that crystal lattice. Um, and so those are relatively kind of weak bonds and, and it stores a sort of a, you know, a nominal amount of energy.
AI assessment note: “those are relatively kind of weak bonds and, and it stores a sort of”
Answered raw tape
D 5 · C 5 · P 4 · Cm 4 4.60
Q Maybe we'll see. So you're at Tesla, one of the most exciting companies in the world. Why did you decide to step down and finish your master's degree and start SELA?
A Um, it was really a choice between after shipping the Roadster, doing the Model S, which I knew was going to be a five-year project, and, and was going to be incredibly hard and incredibly fun, and kind of going back to the beginning. And I, I wanted to take everything I had learned seeing this company go from seven people to 300, from no product to product in the market, and really apply it to, ah, another part of the energy, ah, puzzle. And so, um, with, you know, with that in mind, I kind of, I left and went and spent a couple years studying the science of energy, much, Which led me to batteries, which led me to the chemistry side of things. And, um, and ultimately got exactly what I wanted, which is to start a company that has a, has a chance of making a huge, huge impact on the world.
AI assessment note: “it was really a choice between after shipping the Roadster, doing the Model S”
Answered raw tape
D 4 · C 5 · P 4 · Cm 4 4.30
Q So right, right now the high-end lifespan of a Tesla battery understands about 500,000 miles, half a million miles. Um, does it need to get to a million or two million miles? Is, is that possible? Is it important? Or is it, or is it right now it already lasts so long that the car's gonna break down anyway?
A Look, I, I spent a lot of time thinking about, ah, the long arc of, of transportation, and how do we get to every single car in the world being electric, and what we need to do is, is bring down the cost of, of energy storage to do that, but there's actually sort of two ways to reduce the cost. One is, you can bring down the upfront cost. The other is, you can increase the residual value, right? And so, um, as you move to batteries that are able to last a 1,000,002 1,000,010 million miles, You know, the, the, the residual value is basically the same as the upfront value and, and the cost of capital on an auto loan is very, very low.
AI assessment note: “as you move to batteries that are able to last a 1,000,002 1,000,010 million miles”
