Xiaomi introduced the Redmi Note 12 Discovery Edition 210W fast charging last year, capable of charging the phone’s 4300mAh battery up to 100% in 9 minutes. Today, the company has posted a video of 300W fast charging in China. Ithas modified Redmi Note 12 Pro+ with a built-in 4,100mAh battery to show off its 300W fast charging tech.
As you can see in the video, it took just 2 minutes and 12 seconds to charge to 50% after it is plugged in. It charges up to 100% in 4 minutes and 54 seconds. This is almost double the speed of the high-power solutions that have been mass-produced on the market. The measured peak power is as high as 290W, and it maintains 280W power for 2 minutes.
According to Xiaomi, in order to achieve the speed, it has used 15C ultra-high rate cells and a new “sandwich” stacking scheme. A new hard carbon material is introduced into the battery to replace part of the graphite. The mixed hard carbon and graphite negative electrode mixed in a specific ratio can provide faster reaction speed while taking into account high energy density, thus breaking through the bottleneck of charging speed.
The “sandwich” structure has two ultra-thin cells on the upper and lower sides and a phase-change heat dissipation material filled in the middle can achieve stronger heat dissipation and higher space utilization.
The 300W fourth-generation dual-GaN charging used in this solution is “exactly the same” in size as Xiaomi’s previous 210W charger. Its planar transformer adopts a modular design with a higher degree of integration, and at the same time, it also adds a large area of graphene to assist heat dissipation. As a result, with a power increase of 43%, its volume is exactly the same.
Equipped with Fan, Glue Soaking + Large-area Graphene “Double Heat Dissipation Fins”. It can greatly extend the peak power time and further increase the charging speed. This uses more than 50 security protections for the whole charging system, said the company.
The company did not say when the charging solution will be implemented in smartphones.