{'fraction_non_alphanumeric': 0.018779342723004695, 'fraction_numerical': 0.03004694835680751, 'mean_word_length': 5.62111801242236, '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}}
An ultrafine V2O3 modified hierarchical porous carbon microsphere as a high performance cathode matrix for lithium–sulfur batteries

An ultrafine V2O3 modified carbon microsphere (VCM) was effectively prepared by a facile wet impregnation method and used as a cathode matrix for lithium–sulfur batteries. This resulting composite presents hierarchical porous frameworks of mesopores together with micropores, effectively restrains soluble polysulfides and enhances mass transport. Moreover, V2O3 modification in this mono-dispersed microsphere material can trap polysulfides and mitigate loss of active materials by chemical adsorption. The S/VCM nanocomposites show a high initial discharge capacity of 1177 mA h g−1 at 0.5C and an excellent cycling performance with 921 mA h g−1 after 100 cycles. And it still maintains higher rate capacities of 843 and 719 mA h g−1 at 1C and 2C, respectively, after 100 cycles. These improved electrochemical performances are attributed to the synergistic effects of hierarchical pores and uniformly dispersed vanadium trioxide.