Xiaomi announcedthis morning that it has improved its solid-state battery technology. By replacing liquid electrolyte with solid electrolyte, it not only exceeds the energy density of 1,000 Wh/L, but also significantly improves low-temperature discharge performance and safety. It is said to "solve three major pain points of mobile phone batteries in one fell swoop".
According to Xiaomi, the practical application of lithium metal negative electrodes remains difficult and is not yet ready for production. However, in laboratory tests, the use of solid-state batteries has allowed the battery energy density to exceed 1,000Wh/L, packing a massive 6,000 mAh capacity battery into the small body of the Xiaomi 13 prototype, and significantly improving battery life.
According to an official Xiaomi release, in the Xiaomi laboratory environment, solid-state battery performance improved by more than 20% compared to conventional batteries at -20°C. "Even at high latitudes, we can use it as we like, without fear of the cold".
In addition, Xiaomi says the solid-state battery's puncture resistance has improved dramatically. Xiaomi's engineering team coated the bottom of the positive electrode with a solid electrolyte ceramic When something punctures the battery, this solid electrolyte layer forms a downward layer to encapsulate the positive electrode's collection fluid. This separates it from the negative electrode, preventing contact between the positive aluminium foil and the negative electrode material and avoiding the positive and negative electrodes from bonding together. Thus significantly reducing the thermal damage associated with physical damage.
