{'fraction_non_alphanumeric': 0.03150134048257373, 'fraction_numerical': 0.0160857908847185, 'mean_word_length': 5.169421487603306, '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}}
Role of Hydrophilic APTES-PP Separator in Enhancing the Electrochemical Performance of Ni-Rich Cathode for Li-Ion Battery.

Polypropylene (PP) separators essentially have poor compatibility with normal liquid electrolytes, including EC/DEC, due to the low surface energies of their hydrophobic surfaces. Therefore, they have a poor ability to retain electrolyte solutions within the separators because of low absorption capacity for the liquid electrolytes, which could directly damage the AC impedance and C-rate performance of LIBs. This study aims to improve the hydrophilicity and adhesion properties using (3-aminopropyl)triethoxysilane (APTES) coating on hydrophobic PP separators. Their surfaces were treated with a thin and stable silane layer, using APTES with -NH₂ of the hydrophilic group. Hydrophilic PP separator surfaces with pore structures were fabricated by a facile solution-immersion method. The contact angle of the APTES-PP separator decreased from 102±2.5° to 60±1.5°. The electrochemical measurement results indicate that the cell using the modified PP separator showed a better initial discharge capacity of 165.79 mAh g-1 during the first cycle, at a current density of 0.1 C, as compared with the initial discharge capacity (141.61 mAh g-1) of the cell with a bare PP separator. The performances of all cells with coated PP separators were improved with regard to interfacial resistance, discharge capacity and C-rate capacity, compared to the uncoated PP separator.