Described herein are hydrogen storage materials having desirable characteristics for a variety of applications, such as automobile applications. In one embodiment, a hydrogen storage material includes: (1) a mixed imide having a formula LiiMgjNkHl; and (2) a set of additives; wherein each of i, k, and l is in the range of 1.7 to 2.3, and j is in the range of 0.7 to 1.3; and wherein the hydrogen storage material is configured to absorb at least 3.1 wt. % of H2 within 30 minutes of exposure to H2 gas at a temperature in the range of 100° C. to 140° C. and a pressure in the range of 45 bar to 50 bar.