Xiaomi has now announced the debut of its new battery technology. The company promises that the new high-silicon lithium batteries will deliver 10% more capacity at the same volumes as current lith-ion units. Mass production isn't that far off either.
https://www.notebookcheck.net/Xiaomi-s-new-high-silicon-lithium-battery-technology-promises-10-more-capacity-at-the-same-volume.584088.0.html