کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5150521 | 1498242 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural origin of massive improvement in Li-ion conductivity on transition from (Li2S)5(GeS2)(P2S5) glass to Li10GeP2S12 crystal
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کلمات کلیدی
RMCBVSSXRDToF-NDRMC modelingLIBS - LIBS هاlithium-ion batteries - باتری های لیتیوم یونRoom temperature - دمای اتاقAmorphous structure - ساختار بی نظیرBond valence sum - مجموع ارزش والدینReverse Monte Carlo - معکوس مونت کارلوLithium-ion conductor - هادی لیتیوم یونSynchrotron X-ray diffraction - پراش اشعه ایکس Synchrotrontime-of-flight neutron diffraction - پراش نوترون زمان پرواز
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We carried out synchrotron X-ray diffraction and time-of-flight neutron diffraction experiments for a lithium-ion conductor, (Li2S)5(GeS2)(P2S5) glass, prepared by mechanical alloying. The three-dimensional structure and the conduction pathways of Li ions in (Li2S)5(GeS2)(P2S5) glass were visualized by combining reverse Monte Carlo (RMC) modeling and the bond valence sum (BVS) approach. The electrochemical properties were characterized; the material demonstrated an electrical conductivity, Ï300 K, of 1.5 Ã 10â 5 S/cm at 300 K and an activation energy, Ea, of 55 kJ/mol. In addition, it was found that the most advanced lithium-ion conductor, Li10GeP2S12 crystal (Ï300K = 1.2 Ã 10â 2 S/cm and Ea = 24 kJ/mol), could be obtained by aging the (Li2S)5(GeS2)(P2S5) glass at 803 K. By comparing the conduction pathways of Li ions in (Li2S)5(GeS2)(P2S5) glass with those in Li10GeP2S12 crystal, we found that |ÎV(Li)|max, the maximum BV mismatch value for Li ions, for (Li2S)5(GeS2)(P2S5) glass (|ÎV(Li)|max = 0.13) was significantly larger than that for Li10GeP2S12 crystal (|ÎV(Li)|max = 0.03). This indicates that the potential barrier, Ea, for Li ions moving along the conduction pathways lowers on the transition from (Li2S)5(GeS2)(P2S5) glass to Li10GeP2S12 crystal. Here, we propose that the lowering of the |ÎV(Li)|max is the reason for the structural origin of the massive improvement in Ï300K and Ea during the glass-to-crystal transition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 301, March 2017, Pages 163-169
Journal: Solid State Ionics - Volume 301, March 2017, Pages 163-169
نویسندگان
Kazuhiro Mori, Takuya Kasai, Kenji Iwase, Fumika Fujisaki, Yohei Onodera, Toshiharu Fukunaga,