Yoshino removes metallic lithium from the practical cell

Akira Yoshino developed a cell in which lithium ions moved between a lithium cobalt oxide cathode and a carbon-based anode. Because both electrodes stored ions within their structures, the finished cell contained no free metallic lithium during normal operation. That sharply reduced the dendrite and fire problem that had limited earlier designs. Yoshino also demonstrated that the cell could survive repeated charging, remain stable when discharged and be manufactured in a practical format. The design completed the essential architecture of the modern lithium-ion battery: lithium ions shuttle through the electrolyte, while electrons travel through the external circuit to power a device. Safety still depends on separators, electronics and thermal control; the chemistry alone does not eliminate fire risk.