{'fraction_non_alphanumeric': 0.0338849487785658, 'fraction_numerical': 0.02206461780929866, 'mean_word_length': 5.2254901960784315, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Structurally reconstituted calcium manganate nanoparticles as a high-performance cathode for aqueous Zn-ion batteries

The low capacity and poor cycling performance severely restrict the further development of Mn-based materials for aqueous Zn-ion batteries (AZIBs). Finding effective strategies to address these issues is urgent but still challenging for the design of high-performance cathodes. Here, we developed Ca-deficient Ca0.96Mn3.04O4 nanoparticles (denoted as CP-CMO) by a simple structural reconstitution strategy to achieve high capacity and long cycling durability in AZIBs. The unique nanoparticle architecture endows the CP-CMO sample with improved electrical conductivity and enhanced structural stability, and accelerates the diffusion rate of Zn ions. Correspondingly, the Zn//CP-CMO battery based on the CP-CMO cathode delivers a favorable capacity of 231.1 mA h g−1 at 0.2 mA cm−2, good rate performance, excellent cyclic lifespan and great coulombic efficiency (close to 100%). Moreover, the battery device also exhibits a satisfactory energy density of 299.5 W h kg−1 and a peak power density of 512.5 W kg−1. This work offers an excellent example of using structural recombination strategy to develop high-performance cathode materials for AZIBs.