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Realizing rapid and stable hydrogen sorption at low temperature is critical for magnesium-based hydrogen storage materials. Herein, liquid channels are built in magnesium hydride by introducing lithium borohydride ion conductors as an efficient route for improving its hydrogen sorption. For instance, the 5 wt% LiBH₄-doped MgH₂ can release about 7.1 wt.% H₂ within 40 min at 300 °C but pure MgH₂ only desorbs less than 0.7 wt.% H₂, and more importantly it delivers faster desorption kinetics with more than 10 times enhancement to pure MgH₂. The hydrogen absorption capacity of LiBH₄-doped MgH₂ can still be well kept at approximately 7.2 wt.% without obvious capacity degradation even after six absorption and desorption cycles. This approach is not only through building ion transfer channels as a hydrogen carrier for kinetic enhancement but also by inhibiting the agglomeration of MgH₂ particles to obtain stable cyclic performance, which brings further insights to promoting the hydrogen ab-/desorption of other metal hydrides.