بررسی اثر زمان سنتز هم‏رسوبی ماده کاتدی LiNi0.8Co0.15Al0.05O2 و ارزیابی ساختاری و الکتروشیمیایی آن در باتری لیتیوم-یون

محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین

سحر زیرکی ¹ (دانشجو دکتری رشته مهندسی مواد، بخش مهندسی مواد، دانشکده مهندسی، دانشگاه شیراز، شیراز، ایران)
بابک هاشمی ² (استاد، بخش مهندسی مواد، دانشکده مهندسی، دانشگاه شیراز، شیراز، ایران)
کمال جانقربان ³ (استاد، بخش مهندسی مواد، دانشکده مهندسی، دانشگاه شیراز، شیراز، ایران)
محسن بابایی ⁴ (دکترا، رئیس گروه ذخیرهسازهای انرژی، پژوهشکده مکانیک- پژوهشگاه فضایی ایران)
رحیم اقراء ⁵ (دانشیار، رئیس پژوهشکده مکانیک- پژوهشگاه فضایی ایران)

تاریخ دریافت : 1401/05/08 تاریخ پذیرش : 1401/07/16 تاریخ انتشار : 1401/02/01

کلید واژه: الکتروشیمیایی, باتری لیتیوم-یون, LiNi0.8Co0.15Al0.05O2, هم‏رسوبی,

چکیده مقاله :

مقدمه: باتری لیتیوم-یون شامل اجزای مختلفی می‏باشد که در این میان کاتد جزء مهم و مؤثری در کارایی آن می‏باشد. تاکنون ترکیبات مختلفی به‏عنوان کاتد در باتری‏های لیتیوم-یون مورد استفاده قرار گرفته‏اند که از میان آن‏ها ترکیب NCA (LiNi0.8Co0.15Al0.05O2) توجه زیادی را به دلیل ظرفیت ویژه بالا و حفظ آن به خود جلب کرده است. البته ظرفیت برگشت‏پذیر کاربردی خیلی کمتر از مقدار تئوری می‏باشد که از عوامل آن در کاهش ظرفیت می‏توان به مهاجرت کاتیون نیکل به لایه لیتیومی (ترکیب کاتیونی) و تخریب ساختار لایه‏ای NCA اشاره کرد. با توجه به این مسئله سنتز مناسب این ساختار می‏تواند به افزایش ظرفیت و طول عمر باتری کمک کند.
روش‌: در این پژوهش پیش ماده Ni0.8Co0.15Al0.05(OH)2 با روش هم‏رسوبی با استفاده از آمونیاک به عنوان کمپلکس ‏دهنده برای کنترل واکنش در شرایط دمایC ˚60 و pH=12 تولید شد و سپس به روش حالت جامد و عملیات حرارتی کلسینه و تف‏جوشی به ترتیب در دمای 550 و ˚C800 تحت اتمسفر اکسیژن ماده کاتدی NCA سنتز گردید. برای مقایسه، سنتز پیش ‏ماده Ni0.8Co0.15(OH)2 و سپس افزودن هیدروکسید آلومینیوم به روش حالت جامد نیز انجام شد. اثر نحوه سنتز و زمان سنتز بر نتایج الکتروشیمیایی مورد بررسی قرار گرفت
یافته‌ها: در نمونه با مدت زمان سنتز هم‏رسوبی 4 روز و سپس دو مرحله تف‏جوشی، پیک‏های آندی و کاتدی در نمودار ولتامتری سیکلی به ‏خوبی تشکیل شدند. ظرفیت و برگشت‏ پذیری ظرفیت بهتر و همچنین مقاومت کمتر و ضریب نفوذ لیتیوم بیشتری به دست آمد.
نتیجه‌گیری: نتایج نشان دادند که استفاده از آمونیاک به‏ عنوان عامل کمپلکس در سنتز هم‏رسوبی برای یون آلومینیوم مناسب است. همچنین افزایش زمان سنتز هم‏رسوبی به کامل شدن ساختار لایه‏ ای و در نتیجه افزایش ظرفیت کمک می‏کند. انجام دو مرحله عملیات حرارتی تف‏جوشی نیز در کاهش ترکیب کاتیونی و افزایش ظرفیت اثرگذار است.

چکیده انگلیسی:

Introduction: Cathode is an important component in the performance of Li-ion batteries. Various compounds have been used as cathodes in Li-ion batteries, among which NCA (LiNi0.8Co0.15Al0.05O2) has attracted a lot of attention due to its high specific capacity and capacity retention. However, the applied reversible capacity is lower than the theoretical value, which is because of the migration of Ni cation to the Li layer (cation mixing). Therefore, proper synthesis of this structure can help to increase the capacity and battery lifetime
Methods: In this research, the precursor of Ni0.8Co0.15Al0.05(OH)2 were synthesized by co-precipitation method using ammonia as complexing agent at the temperature and pH of 60˚C and 12 and then NCA cathode powder was obtained by solid state method and calcination and sintering at 550 and 800˚C respectively, under oxygen atmosphere. For comparison, the synthesis of Ni0.8Co0.15(OH)2 and then addition of aluminum hydroxide by solid state method was done. The effects of synthesis method and time were studied.
Findings: Results showed that in the sample with a synthesis time of 4 days and then 2 sintering stages, anodic and cathodic peaks in cyclic voltammetry can be seen clearly. Besides, better capacity and capacity retention, lower charge resistance, and higher Li diffusion were achieved.
Conclusion: Results indicate that ammonia as a complexing agent in co-precipitation synthesis is suitable for the Al ion. Moreover, increasing the synthesis time helps to have complete layered structures, which is followed by better capacity. Two times sintering is also effective in reducing the cation mixing.

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