نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 دانشجوی دکتری، پژوهشکده فناوری نانو و مواد پیشرفته، پژوهشگاه مواد و انرژی، کرچ، ایران

2 استادیار، پژوهشکده فناوری نانو و مواد پیشرفته، پژوهشگاه مواد و انرژی، کرج، ایران

3 دانشیار، پژوهشکده فناوری نانو و مواد پیشرفته، پژوهشگاه مواد و انرژی، کرج، ایران

چکیده

مواد کاتدی اکسیدی لایه‌ای غنی از نیکل LiNi0.8Co0.1Mn0.1O2 (NCM) به‌دلیل چگالی انرژی و ظرفیت بالا به‌طور فزاینده‌ای در صنعت خودروهای الکتریکی مورد توجه قرار دارند. با وجود این، با افزایش مقدار نیکل،  واکنش شیمیایی لایه سطحی و اختلاط کاتیونی Li+/Ni2+افزایش و پایداری ساختاری و حرارتی ماده کاتدی کاهش می‌یابد. راهبرد تک‌کریستالیزاسیون ذرات می‌تواند پایداری ساختاری و عملکرد الکتروشیمیایی مواد کاتدی را بهبود بخشد، ولی سازوکار آن کاملاً شناخته‌شده نیست. در این پژوهش، با ارائه مدلی محاسباتی، نشان می‌دهیم که سرعت جوانه‌زنی ذرات هیدروکسیدی با کاهش pH و کنترل نسبت فوق‌اشباع کاهش می‌یابد و درنتیجه تعداد جوانه‌های تشکیل‌شده کم می‌شود. براساس نتایج این مدل، تعداد جوانه‌های هیدروکسیدی تشکیل‌شده در پایان سنتز هم‌رسوبی در pH ۵/۱۱، 11 و۵/۱۰ به‌ترتیب ۷۳/۵، ۳/۴ و ۲۷/۲ برابر تعداد جوانه‌های تشکیل‌شده در سنتز هم‌رسوبی در pH 10 است. لذا، با کاهش مقدار pH در حین فرایند سنتز از ۵/۱۱ به 10، به ریزذرات تولیدشده در سیستم اجازه داده می‌شود تا به‌طور کامل به کریستال‌های بزرگ‌تر تبدیل شوند و به‌سمت تک‌کریستال شدن تمایل یابند و مشکلات فصل مشترک کاتد/الکترولیت در آن‌ها کاهش یابد. نتایج حاصل از این مدل می‌تواند نتایج تجربی پژوهش‌هایی را که مواد کاتدی تک‌کریستال سنتز کرده‌اند توجیه کند.
 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Synthesis of Hydroxide Precursor Ni0.8Mn0.1Co0.1(OH)2 and Modeling the Effect of Ph on the Rate of Nucleation of Particles

نویسندگان [English]

  • Solmaz Amirshekari 1
  • Reza Riahifar 2
  • Babak Raissi Dehkordi 3
  • Maziar Sahba Yaghmaee 2

1 Ph.D. Student, Department of Nano-Technology and Advanced Materials, Materials and Energy Research Center, Karaj, Iran.

2 Assistant Professor, Department of Nano-Technology and Advanced Materials, Materials and Energy Research Center , Karaj, Iran.

3 Associate Professor, Department of Nano-Technology and Advanced Materials, Materials and Energy Research Center, Karaj, Iran.

چکیده [English]

Nickel-rich layered oxide cathode materials with the chemical formula of LiNi0.8Co0.1Mn0.1O2 (NCM) are increasingly utilized in the electric vehicle industry owing to their high energy density and high capacity. Although increasing the nickel concentration would enhance the chemical reaction between the surface layer and Li+/Ni2+ cationic mixing, the structural and thermal stability of the cathode material would be degraded. The single crystallization strategy of the particles can improve the structural stability and electrochemical performance of the cathode materials; however, their mechanism is not well understood yet. In this research, a computational model was proposed to show that by reducing the pH and controlling the amount of supersaturation, the nucleation rate of hydroxide particles and consequently the number of formed nuclei would decrease. Based on the results of this model, the numbers of hydroxide nuclei formed at the end of co-precipitation synthesis at pH 11.5, 11, and 10.5 were, respectively, 5.73, 4.3, and 2.27 times the number of nuclei formed in co-precipitation synthesis at pH 10. According to the observations, by reducing the pH during the synthesis process from 11.5 to 10, the fine particles produced in the system will be completely transformed into larger crystals, thus tending to become single crystals. As a result, the problems of the cathode/electrolyte intermediate layer will be minimized. The results of this model can justify the experimental results obtained by other researchers who synthesized single-crystal cathode materials.

کلیدواژه‌ها [English]

  • Co-precipitation
  • NCM
  • Single Crystal Cathode
  • Computational Model
  • Lithium-Ion Battery
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