{'fraction_non_alphanumeric': 0.0374414976599064, 'fraction_numerical': 0.01326053042121685, 'mean_word_length': 5.61340206185567, '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}}
Metal Organic Frameworks-Derived Mesoporous Si/SiOx@NC Nanospheres as a Long-Lifespan Anode Material for Lithium Ion Batteries.

Silicon (Si)-based anode materials with suitable engineered nanostructures generally have improved lithium storage capabilities, which provide great promise to the electrochemical performance in Lithium-ion batteries (LIBs). Herein, a metal-organic frameworks (MOFs) derived unique core-shell Si/SiOx@NC structure have been synthesized by a facile magnesiothermic reduction, in which Si and SiOx matrix were encapsulated by nitrogen (N)-doped carbon. Importantly, the well-designed nanostructure having enough space can accommodate the volume change during lithiation/delithiation process. The conductive porous N-doped carbon through direct carbonization and reduction of SiO2 into Si/SiOx were optimized simultaneously. Benefiting from unique core-shell structure, the synthesized product exhibit enhanced electrochemical performance as an anode material in LIBs. Particularly, Si/SiOx@NC-650 anode shows best reversible capacities up to 724 and 702 mAh g-1 even after 100 cycles. The excellent cycling stability of Si/SiOx@NC-650 may attribute to the core-shell structure as well as synergistic effect between Si/SiOx and MOFs derived N-doped carbon.