New progress in Japanese CR2032 battery research: driving range will exceed 1,000 miles

If it can travel 500 kilometers on a full charge, it will rival the performance of gasoline vehicles. The Ministry of Economy, Trade and Industry of Japan believes that this is one of the conditions for the popularization of pure electric vehicles and has proposed a goal to be achieved by 2030. China, where pure electric vehicles are rapidly becoming popular, has ended subsidies for models with a range of less than 150 kilometers and increased subsidies for models with longer ranges.

Lithium-ion batteries were commercialized in 1991 and used in laptop computers and camcorders. They were used in mass-produced pure electric vehicles in 2009. The driving range on a full charge is about 200 kilometers. It is generally believed that it would be difficult to reach 500 kilometers with the technology at the beginning of the 2010s, and it will be replaced by a new generation of batteries such as all-solid batteries around 2030.

The development of new generation batteries is becoming increasingly active worldwide, but there are many technical issues. On the other hand, the technical development of lithium-ion batteries has made progress, and the breakthrough of 500 kilometers is becoming increasingly realistic. Researchers and others predict that "lithium-ion batteries can continue to be used for about 10 years."

Lithium-ion batteries generate electricity and charge by the movement of lithium ions between positive and negative electrodes. To increase the capacity of a battery, it is necessary to increase the ions stored in the electrodes or reduce the internal resistance to make it easier for electrons to pass through.

Sekisui Chemical has developed technology for the positive electrode, working on the structure of the added carbon material to make it easier for electrons to flow. The channel through which electrons pass in the positive electrode is expanded, and the electron flow is smoother, about 10 times that of the past. In addition to obtaining a large amount of generated current, the electrode is less likely to be damaged, and the durability is improved.

The positive electrode will be thickened to allow more lithium ions to be obtained. In experiments, the battery capacity has increased by about 30%. The cruising range can be increased from the current 400 kilometers to more than 500 kilometers. It is planned to be sold as a component by 2021.

Asahi Kasei has increased the capacity by about 20% by mixing silicon oxide into the negative electrode. Adding silicon-based substances to the negative electrode made of carbon materials makes it easier to store lithium ions and can increase the capacity. However, there is a problem that some ions cannot be released when they are captured. By pre-injecting ions into the negative electrode, the captured part is inactive, and the acquisition and release of lithium ions become smooth. Asahi Kasei strives to achieve practical application in a few years.

In addition, research on the use of electrode materials that did not exist before is also advancing. Professor Naoaki Yabuuchi of Yokohama National University, in collaboration with Panasonic, has developed a positive electrode mixed with fluorine. Not only metals, but also oxygen can be used for the flow of electrons in the electrode, and the capacity is doubled. Sumitomo Chemical is promoting the development of negative electrodes using aluminum, with the goal of increasing the capacity by 2.5 times.

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