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The LG G5 phone supports both Qualcomm's Quick Charge 3.0 and USB Power Delivery over USB Type-C, so we’ll see if it is able to work with other USB Power Delivery chargers like the Xiaomi MiBook Charger.

Using a USB Type-C to Type-C cable, we connect the Xiaomi MiBook Charger to the LG G5 and observe their USB Power Delivery negotiations. The charger starts to communicate with the phone over a constant display of a single 10 watts (5 volts @ 2 amps) power profile. However no USB Power Delivery power contract could be seen to happen between both the charger and phone.   

Looking at the power graph, the LG G5 on a fully depleted battery starts pulling around 4.5 watts (5 volts @ 0.9 amps). Charging then immediately goes down to 1 watts (5 volts @ 0.2 amps) and remains at the same level for about 40 seconds. After that frequent rise and fall in the current can be seen as charging continues.​

The Xiaomi MiBook Charger unfortunately is not able to provide proper charging to the LG G5 using USB Power Delivery.