Improvement of crystal structure and electrical performance of NASICON-type NaTi2(PO4)3 solid electrolyte by doping Cr3+ ions

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-12-01 DOI:10.1016/S1003-6326(24)66655-0

Cheng-jian WEN, Zhi-wei LUO, Xin-yu LIU, Ju-xia TONG, Pan HE, An-xian LU

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引用次数: 0

Abstract

A series of Cr³⁺-substituted Na_1+xTi_2−xCr_xP₃O₁₂ (x=0.1, 0.2, 0.3, 0.4, 0.5, molar fraction) solid electrolytes were prepared by the solid-phase reaction method. The effects of Cr³⁺ ions on the phase composition, microstructure, and electrochemical ion conductivity of Na-based conductors were studied using X-ray powder diffraction, field emission scanning electron microscopy, and AC impedance measurement. The results show that the main crystal phase of NaTi₂(PO₄)₃ is formed in the solid electrolytes. The substitution of Ti⁴⁺ sites by 15 at.% Cr³⁺ ions contributes to the enhancement of electrical conductivity, which is attributed to the combined effect of suppressing the formation of impurity phases, broadening ion channels, and improving the bonding degree of grains. Na_1.3Ti_1.7Cr_0.3P₃O₁₂ electrolyte can obtain the best ionic conductivity of 6.13×10⁻⁶ S/cm at room temperature, which is 8 times that of the undoped NaTi₂(PO₄)₃ electrolyte.

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掺杂Cr3+离子改善nasicon型NaTi2(PO4)3固体电解质的晶体结构和电性能

采用固相反应法制备了一系列Cr3+取代的Na1+xTi2−xCrxP3O12 （x=0.1, 0.2, 0.3, 0.4, 0.5，摩尔分数）固体电解质。采用x射线粉末衍射、场发射扫描电镜和交流阻抗测量等方法研究了Cr3+离子对na基导体的相组成、微观结构和电化学离子电导率的影响。结果表明：NaTi2(PO4)3的主晶相形成于固体电解质中；Ti4+位被15at取代。% Cr3+离子有助于提高导电率，这是抑制杂质相形成、拓宽离子通道和提高晶粒结合程度的综合作用。Na1.3Ti1.7Cr0.3P3O12电解质在室温下可获得最佳离子电导率6.13×10−6 S/cm，是未掺杂的NaTi2(PO4)3电解质的8倍。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.