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This study presents a new material, “HxCrS2” (denotes approximate composition) formed by proton‐exchange of NaCrS2 which has a measured capacity of 728 mAh g−1 with significant improvements to capacity retention, sustaining over 700 mAh g−1 during cycling experiments. This is the highest reported capacity for a transition metal sulfide electrode and outperforms the most promising proposed sodium anodes...