Enhancement in conductivity by K2O in MgO-V2O5 glass-ceramic for solid- state battery application

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL Solid State Ionics Pub Date : 2024-09-27 DOI:10.1016/j.ssi.2024.116707

Vimi Dua, K. Singh

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Abstract

Composition of 75V₂O₅-(25-x) MgO-(x) K₂O (x = 6, 9, 12, and 15 mol%) are synthesized by melt quench technique. All the as quenched samples either formed the glasses or glass ceramic as confirmed by differential scanning calorimeter (DSC) and X-ray diffraction (XRD). The DSC curves exhibited the two glass transition temperatures (T_g), two crystallization temperatures (T_c)_, and with two melting temperatures (T_m) which could be related to the presence of two distinct glass in the present samples. The K₂O content increases the devitrification tendency of as quenched samples and formed the crystalline phases i.e. K₃VO₄ along with glassy phase in higher concentration of K₂O. X-ray photoelectron spectroscopy (XPS) is confirmed that the vanadium exhibit two oxidation states V⁴⁺ / V⁵⁺. The highest ratio of V⁴⁺/V⁵⁺ is found in (x = 15) sample which exhibited the highest conductivity i.e. 1.3 × 10⁻³ S/cm at 250 °C. It is two orders higher than the (x = 6) sample at 250 °C. The high conducting glass ceramics can be used as cathode in all solid state battery and fuel cells.

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用于固态电池的 MgO-V2O5 玻璃陶瓷中的 K2O 可增强导电性

利用熔体淬火技术合成了 75V2O5-(25-x)MgO-(x)K2O（x = 6、9、12 和 15 摩尔%）。经差示扫描量热仪（DSC）和 X 射线衍射（XRD）确认，所有淬火样品都形成了玻璃或玻璃陶瓷。差示扫描量热曲线显示出两个玻璃化转变温度（Tg）、两个结晶温度（Tc）和两个熔化温度（Tm），这可能与样品中存在两种不同的玻璃有关。K2O 的含量增加了淬火样品的蜕变趋势，并在 K2O 浓度较高时形成了结晶相，即 K3VO4 和玻璃相。X 射线光电子能谱（XPS）证实，钒呈现出 V4+ / V5+ 两种氧化态。(x = 15) 样品中 V4+/V5+ 的比例最高，在 250 °C 时显示出最高的电导率，即 1.3 × 10-3 S/cm。在 250 °C 时，它比 (x = 6) 样品高出两个数量级。高导电性玻璃陶瓷可用作所有固态电池和燃料电池的阴极。

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.