Akira Yoshino

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Lore & Background

Akira Yoshino was born in Suita, Japan, on 30 January 1948. He graduated from Kitano High School in Osaka City in 1966. He earned a B.S. in 1970 and an M.S. in 1972, both in engineering from Kyoto University, and a Dr.Eng. degree from Osaka University in 2005. During elementary school, a teacher suggested he read The Chemical History of a Candle by Michael Faraday, which sparked his interest in chemistry. In college, he attended a course taught by Kenichi Fukui, the first recipient of East Asian ancestry to be awarded the Nobel Prize in Chemistry. Yoshino spent his entire non-academic career at Asahi Kasei Corporation, starting there in 1972 after his master's degree. He joined the Exploratory Research Team in the early 1970s, initially exploring polyacetylene for general-purpose materials. In 1981, he began researching rechargeable batteries using polyacetylene. In 1983, he fabricated a prototype using lithium cobalt oxide as cathode and polyacetylene as anode, a direct precursor to the modern lithium-ion battery. By 1985, he switched to carbonaceous material as anode, creating the first prototype of the lithium-ion battery and receiving the basic patent. He developed the aluminum foil current collector, the functional separator membrane, and the use of a positive temperature coefficient device for safety. He also conceived the coil-wound structure to provide large electrode surface area. The battery was commercialized by Sony in 1991 and by A&T Battery in 1992.

Reader's Guide

Akira Yoshino's creation of the first safe, production-viable lithium-ion battery revolutionized portable electronics, enabling the widespread use of cellular phones and notebook computers. His work built on earlier discoveries, including the lithium cobalt oxide cathode discovered in 1979 by Godshall et al. at Stanford University, and John Goodenough and Koichi Mizushima at Oxford University, and the conductive polymer polyacetylene discovered by Hideki Shirakawa. Yoshino's key innovations included identifying carbonaceous material with a specific crystalline structure as a suitable anode, developing an aluminum foil current collector that formed a passivation layer to enable high cell voltage at low cost, and designing a functional separator membrane and a positive temperature coefficient device for safety. He also conceived the coil-wound structure to provide large electrode surface area and enable high current discharge despite the low conductivity of the organic electrolyte. In 1986, he commissioned the manufacture of a batch of LIB prototypes, and based on safety test data, the United States Department of Transportation issued a letter stating the batteries were different from metallic lithium batteries. His contributions earned him the Nobel Prize in Chemistry in 2019, alongside M. Stanley Whittingham and John B. Goodenough, and numerous other awards including the Japan Prize in 2018, the Charles Stark Draper Prize in 2014, and the Order of Culture in 2019.

Did You Know?

• Akira Yoshino earned his Dr.Eng. degree from Osaka University in 2005, over 30 years after his master's degree.
• In elementary school, a teacher suggested he read The Chemical History of a Candle by Michael Faraday, which sparked his interest in chemistry.
• Yoshino attended a course taught by Kenichi Fukui, the first Nobel laureate in Chemistry of East Asian ancestry.
• In 1986, Yoshino commissioned the manufacture of a batch of LIB prototypes, leading the U.S. DOT to confirm they were different from metallic lithium batteries.
• Yoshino developed the aluminum foil current collector, which formed a passivation layer to enable high cell voltage at low cost.

A Spark from a Candle: Early Life and Education

Born in the Osaka suburb of Suita on 30 January 1948, Yoshino's path into chemistry was far from predetermined. As a young elementary student he had little interest in the subject until a teacher recommended Michael Faraday's classic text, The Chemical History of a Candle. That single suggestion ignited a flood of questions and a lasting fascination with how substances interact at a molecular level. He went on to attend Kitano High School in Osaka City, graduating in 1966, before pursuing engineering studies at Kyoto University, where he earned his bachelor's degree in 1970 and his master's in 1972. A particularly formative encounter came during his university years, when he sat in on a course taught by Kenichi Fukui—the first scientist of East Asian ancestry to receive the Nobel Prize in Chemistry. That exposure to a fellow Japanese chemist at the pinnacle of the field must have reinforced Yoshino's conviction that such heights were attainable. He would not return to academia for a doctorate until 2005, when Osaka University awarded him a Dr.Eng., a testament to a career spent in industry rather than the lecture hall.

From Polyacetylene to Carbon: Inventing the Lithium-Ion Battery

The journey from laboratory curiosity to the battery that powers modern life unfolded over a handful of pivotal years. In 1981, Yoshino began exploring rechargeable cells built around polyacetylene, the electroconductive polymer originally identified by Hideki Shirakawa. By 1983 he had assembled a working prototype pairing lithium cobalt oxide as the cathode with polyacetylene as the anode—a configuration in which the anode itself held no lithium, and ions shuttled from cathode to anode during charging. The architecture was elegant, but polyacetylene's low density demanded bulky cells, and its chemical instability proved a persistent headache. Yoshino's decisive move was to replace it with a carbonaceous material whose crystalline structure he identified as particularly well-suited to host lithium ions. In 1985 he fabricated what is widely regarded as the first true lithium-ion battery prototype and secured the foundational patent. He also engineered the aluminum-foil current collector, a functional separator membrane, a positive-temperature-coefficient safety device, and the coil-wound cell geometry that maximized electrode surface area while accommodating the sluggish conductivity of organic electrolytes. Sony brought the design to market in 1991, and A&T Battery followed in 1992.

A Decade of Discovery at Asahi Kasei

Yoshino's professional life was defined by a single corporate home. He joined Asahi Kasei Corporation immediately after completing his master's degree in 1972 and remained there for the rest of his non-academic career. In the early 1970s he was placed in the company's Exploratory Research Team, where the mandate was to hunt for novel general-purpose materials. His initial focus was finding practical applications for polyacetylene, but the landscape shifted when Japan's electronics industry began pushing for lightweight, compact rechargeable batteries to power the next generation of mobile devices. That industrial demand redirected his curiosity toward electrochemistry. By 1982 he was working out of the Kawasaki Laboratory, and in 1992 he was elevated to manager of product development for ion batteries. Two years later he took on the role of technical development manager at A&T Battery Corp., a joint venture between Asahi Kasei and Toshiba. Asahi Kasei recognized his contributions by naming him a fellow in 2003 and, in 2005, giving him his own laboratory as general manager. In 2017 he transitioned to a professorship at Meijo University in Nagoya while retaining the title of honorary fellow at Asahi Kasei.

Rewiring the World: Legacy and Recognition

The battery Yoshino helped bring to life quietly rewired the global economy. From the first cellular phones and notebook computers of the early 1990s, the lithium-ion cell has become so ubiquitous that its origins are often forgotten. Yoshino's 1985 prototype, commercialized by Sony in 1991 and A&T Battery in 1992, established the architecture—carbon anode, lithium cobalt oxide cathode, organic electrolyte—that still underpins the technology. His contributions extended well beyond the anode choice: the aluminum-foil current collector, the separator membrane, the PTC safety device, and the coil-wound geometry all bore his fingerprints. Recognition arrived steadily over the decades, from Japan's Medal with Purple Ribbon in 2004 to the IEEE Medal for Environmental and Safety Technologies in 2012, the Global Energy Prize in 2013, the Draper Prize in 2014, and the Japan Prize in 2018. The culmination came in 2019, when he shared the Nobel Prize in Chemistry with M. Stanley Whittingham and John B. Goodenough. That same year he received the Order of Culture and the European Inventor Award, and in 2023 the VinFuture Prize added another chapter to an already extraordinary record.