All-Solid-State Batteries Achieve 300 Watt-Hours of Energy Density by Weight, One Step Toward Practical Use by Softbank, etc.

According to the September 8 NewSwitch Nikkan Kogyo Shimbun, Softbank and Enpower Japan (Minato-ku, Tokyo; President: Che Yong) have succeeded in increasing the energy density of all-solid-state batteries to just over 300 watt-hours per kilogram of weight. This is comparable to the highest value of conventional lithium-ion batteries (LiB). All-solid-state batteries are expected to be in demand for use in automobiles and smartphones because of their ease of application for rapid recharging. The establishment of a technology that increases energy density to the same level as LiBs is expected to further strengthen expectations for their commercialization.

The results of joint research on next-generation batteries with high energy density and large storage capacity are the result of establishing technology to reduce the interface resistance between the cathode material and solid electrolyte layer and the weight ratio of solid electrolyte in the cathode compound in all solid-state batteries that employ lithium metal as the anode material, whereas scaled graphite is mainly used in LiBs. The energy density per kilogram of battery has now reached a level exceeding 300 watt-hours.

All-solid-state batteries that use solid electrolyte as the ionic conductor are safer than LiB batteries that use an organic solvent electrolyte, and can be used over a wide temperature range, making it easier to adapt to high temperatures during rapid charging. On the other hand, the use of solid electrolytes with high specific gravity tends to increase weight and lower energy density.

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