“I’m living on borrowed time,” John B. Goodenough told DCD. “So we have to live day by day. We never know what’s going to happen.”
At 96, the inventor of the lithium-ion battery could be forgiven for taking a break and enjoying the fruits of his labor. But he is still working, still trying to create a battery that will solve the crisis he first saw coming nearly 50 years ago.
To understand Goodenough’s quest to build the ultimate battery, one must revisit key points in his life, that worked together to push him towards this goal.
The first came at the start of World War II, when Goodenough was studying classics and mathematics at Yale. Knowing he would be spending some time in the Army, the young academic was at a loss over what to do in life. Then he read Alfred North Whitehead’s seminal book Science and the Modern World, which analyzed the impact of scientific discovery on different historical periods.
“I just had a feeling that what I was supposed to do was science,” Goodenough said. “I had no money – how was I going to go to graduate school? I didn’t have the vaguest idea. But I knew if I had the opportunity I should go study physics.”
When the war ended, he was given his chance with President Roosevelt’s G.I. Bill which granted university stipends to help veterans readjust. “I was very lucky,” he acknowledged.
After studying solid-state physics under Professor Clarence Zener, Goodenough was given a job at the Lincoln Laboratory of the Massachusetts Institute of Technology (MIT). There, he helped develop the Semi-Automatic Ground Environment (SAGE) system for air defense. Not only was he part of a team responsible for inventing random access memory (RAM), Lincoln also served as the next pivotal moment in his life.
“It was interdisciplinary, so physics, chemistry and engineering were all involved together,” Goodenough said. “And that gave me the opportunity to really move in the direction of materials science and engineering. It’s that opportunity to work with chemists, physicists and engineers that really matured and developed me.”
Unfortunately, after a few more years studying magnetism and ceramics, outside forces once again conspired to change the course of his life. In 1969, Congress passed Section 203, an amendment put forward by Senator Mansfield that forbade the use of military funds for research on projects that were not related to specific military functions.
“There came a moment where they said ‘well you’re in a laboratory that is sponsored by the Air Force, and the basic research that you’re doing is not targeted to a mission. You can’t do it anymore.’”
This proved to be one of the most fortuitous lay-offs in modern history. After spending a little over a year working on a traveling-wave amplifier, “the energy crisis came.” Seeing people lined up at gas stations, Goodenough knew he had to work on something related to energy.
“So that’s why I turned to studying energy materials and then I was invited to go to Oxford. And I officially became a chemist at that point.”
The 1970s energy crisis also inspired others. Early in the decade, Stan Whittingham discovered a way to diffuse lithium ions into sheets of titanium sulfide, something that could be useful for building a rechargeable battery, and was given a job at Exxon.
Lithium ions are able to quickly and easily intercalate within layers of titanium sulfide, a reversible process which could allow the creation of a highly conductive, rechargeable battery. With a huge budget, Whittingham’s team set to work on creating the first room-temperature, rechargeable lithium cell. They succeeded, but there was a catch – “within months they discovered they were having fires and explosions in their batteries,” Goodenough said.
“When you charged them, the lithium formed dendrites that grow across the electrolyte and give you an internal short circuit. And that causes fires and explosions. So, at that point, that program was stopped.”
In addition to dendrite issues, the titanium sulfide was expensive, hard to synthesize, and posed health risks, so research was needed to find alternative compounds, such as other layered oxides that could be used.
Goodenough, asked by Exxon to join the team but having chosen Oxford instead, watched the program with interest. “I thought, now I’ve got students that need something to do, and I’ve been working on oxides for a while.”
So he decided to try to solve the problem. By 1980, he had an answer – to use LixCoO2 as the cathode for the battery. The lithium-cobalt oxide proved more stable and lighter than other oxides, and soon proved a success.
“That was the birth of the first lithium-ion battery, which was licensed to the Sony Corporation to make the first lithium-ion camcorder and launched the wireless revolution,” Goodenough said.
With that invention, and the subsequent boom in electronics, Goodenough became a much-lauded figure in scientific circles, receiving the Japan Prize, Enrico Fermi Award and National Medal of Science, to name a few.
But he was not satisfied with his invention, nor subsequent innovations, such as the identification of LixFePO4 as a cheaper cathode material. “When we were doing it, we had in mind that the people at that time were developing wind farms in order to get wind energy, and photovoltaic cells in order to get solar energy and they needed batteries to store it or those technologies aren’t any good,” he said.
“The wireless revolution was an intermediate step which was very useful for what it did and I didn’t anticipate how clever the electrical engineers were going to be in making all the things that you’re now putting in your pocket… but it doesn’t solve what we originally set out to do – this realization that modern society and its dependence on the energy stored in fossil fuels is not sustainable.”
Lithium-ion batteries have now matured to a point where they are viable for grid-scale energy storage solutions, although concerns still exist about how many discharge-charge cycles they can support, as well as the supply chain issues, with both lithium and cobalt being relatively rare.
Goodenough wants to improve on this, and also wants “to be able to make electric cars that are safe and that you can charge fast. You don’t have to charge them overnight.”
The current liquid electrolyte battery system needs to be charged slowly, and often with the help of an expensive battery management system – otherwise it can form dendrites. The issue is nowhere near as severe as in Whittingham’s original invention, but it still plagues batteries, and haunts Goodenough: “You’ve got to eliminate dendrites, you’ve got to eliminate the safety problem.”