[World's first] Succeeded in prototyping and demonstrating a battery with an energy density of 520 Wh/kg (1100 Wh/L)

Enpower Japan Co., Ltd. Enpower Greentech Inc. (hereinafter “Enpower Greentech”), which owns Enpower Japan Co., Ltd. (hereinafter “Enpower Japan”), is a joint venture with SoftBank Corp. (hereinafter “SoftBank”). In our research, we succeeded in prototyping and demonstrating a lithium metal battery with an energy density of 520 Wh/kg (1100 Wh/L). It is the first battery in the world to simultaneously achieve a gravimetric energy density of 520Wh/kg, a volumetric energy density of 1100Wh/L, and a cycle life of 100 cycles or more. This battery is an evolved version of the 450 Wh/kg class lithium metal battery announced by Enpower Greentech and Softbank on March 15, 2021. In terms of design, we have greatly exceeded the limit of energy density while maintaining the charge-discharge stability as a secondary battery while reducing the usage ratio of non-active materials. This performance verification was conducted using multiple battery samples at multiple third-party organizations, including the SoftBank Next-Generation Battery Lab. The specifications of this battery were also announced at the Enpower Japan booth at the "Smart Energy Week 2021 International Rechargeable Battery Exhibition" held at Tokyo Big Sight from September 29th to October 1st. An energy density of 500 Wh/kg (1000 Wh/L) is a target that many companies and government research projects aim to achieve from 2025 to 2030. We achieved an improvement of 70Wh/kg in just 7 months from the announcement. The capacity of the battery successfully demonstrated this time is 3600mAh, which is almost the same as the lithium-ion battery (existing LIB) currently used in mobile phones, but the weight and volume of this battery are about half that of the existing LIB. , which means that for the same volume and weight, it is possible to significantly extend the talk time. It will also double the flight time of drones and the range of electric vehicles. In the future, by increasing the design capacity of the battery unit to the 10Ah level and adopting new high-voltage, high-capacity cathode materials, it is possible to realize even higher-energy batteries. Currently, Enpower Greentech is aiming for early commercialization of 400-500Wh/kg class lithium metal batteries through active collaboration with customers seeking next-generation batteries with high energy density. In addition, following the presentation at the 2021 Spring Meeting of the Electrochemical Society of Japan regarding lithium metal anode technology, which is the key to achieving high energy density, Enpower Japan will also announce the battery performance successfully demonstrated this time from November 30, 2021. We plan to make a presentation at the 62nd Battery Symposium scheduled for December 2nd. The Enpower Group (hereinafter "Enpower") is a technology group that conducts research and development centered on next-generation batteries and their core materials. We have formed a team of selected engineers based in the United States, China, and Japan, and we continue to work toward solving global environmental issues through global innovation while leveraging the strengths of each location. Enpower also has extensive collaborations in both academia and industry. In collaboration with the team led by Professor John Goodenough of the University of Texas at Austin, who won the 2019 Nobel Prize in Chemistry, we have continued joint development of lithium metal interface technology and solid electrolyte material technology. In addition, we will collaborate with Japanese universities such as Tokyo Institute of Technology and more than 20 energy-related companies to contribute to the realization of a decarbonized society through the practical application of innovative next-generation batteries. For details, see our website news release https://enpowerjp.co.jp/2021/10/25/news-release-1025/