SoftBank Achieves Breakthrough in Solid-State Battery Tech

Tokyo, Japan - SoftBank Corp. and Enpower Japan Inc. announced the successful development of a solid-state lithium metal battery cell with a 350 Wh/kg gravimetric energy density.

This development represents a significant advancement towards the companies' objective of developing high-capacity, lightweight batteries for high-altitude platform stations (HAPS) and other applications.

The new technology comprises enhancements in the homogenization of solid electrolytes, an augmentation in the ratio of active materials, and a reduction in the thickness of the solid electrolyte layer. 

These enhancements have resulted in a reduction in interface resistance and an improvement in battery capacity.

SoftBank and Enpower Japan aim to demonstrate a gravimetric energy density of 400 Wh/kg by the end of fiscal 2024. 

Moreover, the objective is to achieve over 1,000 charge-discharge cycles by the conclusion of the fiscal year 2026.

The companies are currently addressing the remaining challenges, including the issue of short-circuiting in large pouch cells during cycling. 

The companies will continue to develop material and electrode homogenization technologies to prevent short circuits in large-area electrodes and stacked configurations.

Future plans include expanding the application of these next-generation batteries to aviation fields, including high-altitude platforms and drones, the Internet of Things, and automotive uses. 

This expansion is anticipated to facilitate the resolution of social issues through the application of advanced battery technology.

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