دکوراسیون نوری نانوذرات نقره بر روی تیتانیوم نیوبات نانوساختار به‌عنوان آند باتری لیتیوم یون
محورهای موضوعی : سنتز مواد
علی رضا رحمانی
1
,
مهدی خدایی
2
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1 - دانشجوی دکتری، مهندسی مواد، دانشکده مهندسی و علم مواد، دانشگاه صنعتی خواجه‌نصیرالدین طوسی، تهران
2 - دانشیار، مهندسی مواد، دانشکده مهندسی و علم مواد، آزمایشگاه تحقیقاتی مواد پیشرفته و نانوفناوری، گروه تحقیقاتی مترونیک و متریونیک، دانشگاه صنعتی خواجه‌نصیرالدین طوسی، تهران.
کلید واژه: سل – ژل اکسید مضاعف نقره باتری لیتیوم یون آند تداخلی.,
چکیده مقاله :
در زمینه مواد آندی جایگزین برای گرافیت، ماده تیتانیوم نیوبات با استوکیومتری TiNb2O7 و ساختار کریستالی منوکلینیک یکی از موارد جالب توجه به شمار می آید. این ماده پتانسیل لیتیوم دار شدن بالایی دارد که به نوبه خود باعث ایمنی ذاتی و جلوگیری از کاهش یافتن یون های لیتیوم به صورت دندریت های فلزی می شود. همچنین ظرفیت ویژه جرمی این ماده قابل مقایسه با گرافیت است که آن را برای کاربرد های عملی مناسب می گرداند. در این تحقیق از رهیافت سل-ژل بر اساس تبخیر برای سنتز نانوساختار تیتانیوم نیوبات با کوپلیمر F127 به عنوان عامل هدایت ساختار استفاده شده است. سرامیک اکسیدی مضاعف بدست آمده نیمه هادی است و می توان آن را با تابش نور فرابنفش برای ایجاد حامل های بار و رسیدن آن ها به سطح تحریک کرد. با استفاده از این پدیده نانوذرات نقره به عنوان جزء افزایش دهنده هدایت سطحی به صورت ترجیحی بر روی مراکز تجمع الکترون دکور می شوند. نمونه های بدست آمده با استفاده از روش های مختلف از جمله تفرق سنجی اشعه ایکس پودری، تبدیل فوریه عبور فروسرخ، میکروسکوپی الکترونی روبشی، آنالیز عنصری به صورت طیف انرژی اشعه ایکس و طیف سنجی بازتاب پخشی مشخصه یابی شده اند. همچنین نیم پیل های سکه ای با استفاده از مواد حاصل ساخته شدند و تحت آزمون ظرفیت سنجی گالوانواستاتیک مشخص شد که با دکوراسیون نانوذرات نقره بر روی مراکز تجمع الکترون سطحی می توان ظرفیت باتری حاصل را تا بیش از 5/2 برابر در نرخ شارژ و دشارژ بالا افزایش داد.
In the field of alternative anode materials for graphite, titanium niobate material with TiNb2O7 stoichiometry and monoclinic crystal structure is one of the interesting cases. This material has a high potential for lithium, which in turn causes intrinsic safety and prevents the reduction of lithium ions in the form of metal dendrites. Also, the specific mass capacity of this material is comparable to graphite, which makes it suitable for practical applications. In this research, the sol-gel approach based on evaporation has been used for the synthesis of titanium niobate nanostructure with F127 copolymer as the structure directing agent. The resulting double oxide ceramic is a semi-conductor and can be stimulated by ultraviolet light to create charge carriers and bring them to the surface. By using this phenomenon, silver nanoparticles are preferentially decorated on electron accumulation centers as a component to increase surface conductivity. The obtained samples have been characterized using different methods such as powder X-ray diffraction, Fourier transform infrared transmission, scanning electron microscopy, elemental analysis in the form of X-ray energy spectrum and diffuse reflection spectroscopy. Also, half-coin batteries were made using the resulting materials, and under the galvanostatic capacitance test, it was found that by decorating the surface electron accumulation centers with silver nanoparticles, the capacity of the resulting battery can be increased by more than 2.5 times in terms of charge and discharge rates. raised up.
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