Details

Autor(en) / Beteiligte

• Sun, Yingxue
• Chen, Zan
• Li, Claudia
• Duan, Cuijia
• Guo, Hongfei
• Huang, Xinyao
• Zhang, Tongtong
• Lim, Kang Hui
• Li, Yinhui
• Kawi, Sibudjing

Titel

Bismuth oxychloride nanosheets anchored aramid separator with sponge-like structure for improved lithium-ion battery performance

Ist Teil von

• Journal of colloid and interface science, 2024-12, Vol.675, p.117-129

Ort / Verlag

United States: Elsevier Inc

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• PMIA-BiOCl composite separators were prepared by means of non-solvent induced phase separation (NIPS). The positively charged oxygen vacancies in BiOCl nanosheets could interact with anions (PF6-) and anchor them on the PMIA fiber network, which realized the desolvation of Li+ for the purpose of ion-selection and improved the Li+ transport efficiency, leading to remarkably improved Li+ transference number (up to 0.79) and lithium-ion conductivity. Meanwhile, the sponge-like porous structure of PMIA-BiOCl composite separators and the efficient transport of Li+ alleviate the concentration polarization, regulate and uniformly deposit Li+, and reduce the growth of lithium dendrites. Therefore, compared with lithium-ion batteries (LIBs) assembled with commercial PP separators, the electrochemical and safety performance of LIBs assembled with PMIA-BiOCl composite separators are greatly improved. The rate capacity and cycle durability of LIBs assembled with PMIA-BiOCl composite separators can be significantly improved, which offers new prospects for high-performance LIBs. [Display omitted] Functional modification of inorganic particles is an effective approach to tackle the issue of Li+ transport and the lithium dendrites formation in lithium-ion batteries (LIBs). In this study, PMIA/BiOCl composite separators are prepared by nonsolvent induce phase separation (NIPS) method using P-type semiconductor bismuth oxychloride (BiOCl) functionalized poly (m-phenylene isophthalamide) (PMIA) separators. Compared with the polypropylene (PP) separator, PMIA has superior thermal stability and the addition of BiOCl further enhances its flame retardancy. And the prepared PMIA/BiOCl separator presents improved porosity (66.47 %), enhanced electrolyte uptake rate (863 %) and higher ionic conductivity (0.49 mS∙cm−1). Besides, the incorporation of BiOCl can anchor PF6- to the three-dimensional network skeleton of the PMIA/BiOCl separators, enabling the desolvation of Li+ and selectively facilitating Li+ transport (the Li+ transfer number is 0.79). Moreover, the uniform porous structure of the PMIA/BiOCl separators and the efficient transport of Li+ uniformly deposite Li+, and minimize the growth of lithium dendrites. Batteries assembled with PMIA/BiOCl separators have a discharge specific capacity of 124.4 mAh∙g−1 and capacity retention of 96.7 % after 200 cycles at 0.2C. Therefore, this work provides an effective route in the design strategy of separators for LIBs.