New silicon-carbon battery technology is allowing some smartphones to reach capacities over 10,000 mAh without increasing device size. This shift challenges the long-standing dominance of traditional lithium-ion cells by offering significantly higher energy density. However, major manufacturers like Apple and Samsung remain cautious due to stability concerns. The tendency of silicon-carbon materials to expand and contract during charge cycles can lead to faster degradation or safety risks, making these companies wait for the technology to mature before wide adoption.
