ساخت شیشه- سرامیک هادی یون لیتیوم با هدایت یونی بالا برای ساخت باتری‌های لیتیوم- اکسیژن و یون- لیتیوم تمام جامد

نویسندگان

1 1- دانشکده فنی و مهندسی، گروه مهندسی شیمی، دانشگاه اراک

2 2- دانشکده فنی و مهندسی، گروه مهندسی مواد، دانشگاه ملایر

3 3- انستیتو تحقیقاتی مهندسی شیمی و نفت، پاریس، فرانسه4- دانشکده مهندسی و علوم، دپارتمان مهندسی مواد، متالورژی و معدن، دانشگاه لاوال، کبک، کانادا5- دانشکده مهندسی، دپارتمان مهندسی شیمی، واحد تحقیقاتی ترمودینامیک دوربان، دانشگاه کوازولو- ناتال، افریقای جنوبی

چکیده

در این تحقیق غشای شیشه- سرامیک جدید با ساختار نوع ناسیکون و فرمول کلی (Li1+x+yAlxCryGe2-x-y(PO4)3, x+y=0/5) با روش انجماد سریع شیشه مذاب و تبدیل به شیشه- سرامیک از طریق عملیات حرارتی، سنتز و اثر اضافه نمودن غلظت‌های متفاوتی از عناصر آلومینیوم و کروم به ساختار LiGe2(PO4)3 جهت بهبود هدایت یونی مورد بررسی قرار گرفت. جایگزینی جزئی یون‌های Ge4+ موجود در ساختار ناسیکون با یون‌های Al3+ و Cr3+ منجربه القای مقادیر بیشتری از یون‌های لیتیم در حفره‌های خالی A2 جهت موازنه بار و همچنین تغییر در پارامترهای شبکه کریستال شد. این دو عامل باعث افزایش هدایت یونی شیشه- سرامیک شد. مشخصه‌یابی و بررسی ساختارهای آمورف و کریستاله در این تحقیق با آزمون‌های پراش پرتو ایکس (XRD)، میکروسکوپ الکترونی روبشی گسیل میدانی (FESEM)، طیف‌سنجی پراش انرژی پرتو ایکس (EDX)، گرماسنجی پویشی تفاضلی (DSC) و طیف سنجی امپدانس مختلط (CIS) انجام گرفت. بیشترین هدایت یونی برابر با8/82Í10-3  زیمنس بر سانتی‌متر برای نمونه با x=0/4 و y=0/1، (Li1.5Al0.4Cr0.1Ge1.5(PO4)3) که در دمای 850 درجه سانتی‌گراد برای مدت 8 ساعت کریستاله گردید، حاصل شد. این نمونه همچنین کمترین انرژی اکتیواسیون معادل با 267/0 الکترون ولت را از خود نشان داد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Preparation of Lithium Ion Conductor Glass-Ceramic with High Conductivity for Producing Lithium-Air and all-Solid-State Lithium-Ion Batteries

نویسندگان [English]

  • M. Illbeigi 1
  • A. R. Fazlali 1
  • M. Kazazi 2
  • A. H. Mohammadi 3
چکیده [English]

In this research, new lithium ion conductor glass-ceramics with NASICON-type structure (Li1+x+yAlxCryGe2-x-y (PO4)3, x+y=0.5) were synthesized using melt-quenching method and converted to glass-ceramics through heat treatment. Influence of addition of different concentrations of aluminum and chromium in LiGe2(PO4)3 glass-ceramic was investigated for ionic conduction improvement. Substitution of Ge4+ ions in NASICON structure by Al3+ and Cr3+ ions induced more Li+ ions in A2 vacant sites to obtain charge balance and also changed the unit cell parameters. These two factors led to ionic conductivity improvement of synthesized glass-ceramics. The glass-ceramics were characterized and the amorth structures were investigated by X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Energy-Dispersive X-ray spectroscopy (EDX), Differential Scanning Calorimetry (DSC) and Complex Impedance Spectroscopy (CIS). The highest lithium ion conductivity of 8.82×10-3 S/cm was obtained for x=0.4 and y=0.1 (Li1.5Al0.4Cr0.1Ge1.5(PO4)3) crystallized at 850 oC for 8 h with minimum activation energy of 0.267 eV.
 

کلیدواژه‌ها [English]

  • Solid electrolyte
  • NASICON-type glass-ceramic
  • Lithium ion conductor
  • Lithium-air battery
  • All-solid-state battery
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