喷雾干燥-高温烧结的NaMnPO4制备及其电化学性能

doi:10.13208/j.electrochem.140416

电化学（中英文） ›› 2014, Vol. 20 ›› Issue (6): 542-546. doi: 10.13208/j.electrochem.140416

喷雾干燥-高温烧结的NaMnPO₄制备及其电化学性能

林晓琛，吴晓彪，侯旭，杨勇^*

厦门大学化学化工学院化学系，固体表面物理化学国家重点实验室，福建厦门 361005

收稿日期:2014-04-16 修回日期:2014-04-23 出版日期:2014-12-28 发布日期:2014-04-28
通讯作者: 杨勇 E-mail:yyang@xmu.edu.cn
基金资助:
973国家重点基础研究发展计划（No. 2011CB935903）和国家自然科学基金（No. 21233004和No. 21021002）项目资助

Synthesis of NaMnPO₄ by Spraying Drying-High Temperature Sintering and Its Electrochemical Performance

LIN Xiao-chen, WU Xiao-biao, HOU Xu, YANG Yong^*

State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China

Received:2014-04-16 Revised:2014-04-23 Published:2014-12-28 Online:2014-04-28
Contact: YANG Yong E-mail:yyang@xmu.edu.cn

摘要/Abstract

摘要： 采用喷雾干燥制备前驱体，经高温烧结制得有电化学活性的钠离子电池NaMnPO₄正极材料. X射线衍射分析（XRD）证明，合成的NaMnPO₄材料系正交晶系、Pmnb空间群的磷钠锰矿（Natrophilite）型材料. 扫描电镜（SEM）及透射电镜（TEM）结果显示，喷雾干燥得到的前驱体为空心球粒子，经高温烧结后，该材料由粒径几十纳米的NaMnPO₄纳米晶一次颗粒及无定形碳网络结构相互连接组成的微米级二次颗粒构成. 电化学测试表明，NaMnPO₄/C复合结构显著改善了材料的离子电导与电子电导，首次报道电流密度为7.75 mA·g^-1、电压范围为1.0 ~ 4.5 V (vs. Na⁺/Na)时，钠离子电池NaMnPO₄正极材料的可逆放电比容量达90 mAh·g^-1.

关键词: 钠离子电池, 正极材料, NaMnPO₄, 喷雾干燥, 电化学性能

Abstract: As a cathode material for sodium ion batteries, NaMnPO₄/C nanocomposite is successfully synthesized by the combination of spraying drying and high temperature sintering methods. The crystal structure of the as-synthesized phosphate material is confirmed as the natrophilite NaMnPO₄, which possesses orthorhombic symmetry and Pmnb space group. It is shown that the precursors are hollow spherical particles and the obtained product consists of micro-scaled secondary particles, which are composed of NaMnPO₄ nanocrystallites (tens of nanometres) and amorphous carbon networks. The ionic and electronic conductivities of NaMnPO₄ are both effectively enhanced with the help of this nanocomposite structure. In addition, the differences in the Na+-diffusion channel and local structures among the three types of NaMPO₄, i.e. olivine, maricite and natrophilite, are also discussed. The electrochemical tests show that the natrophilite NaMnPO₄ can deliver the reversible capacity of 90 mAh·g^-1 at a current density of 7.75 mA·g^-1 when cycled in the voltage range of 1.0-4.5 V (vs. Na⁺/Na).

Key words: sodium ion batteries, cathode material, NaMnPO₄, spraying drying, electrochemical performance

中图分类号:

O646

林晓琛，吴晓彪，侯旭，杨勇*. 喷雾干燥-高温烧结的NaMnPO₄制备及其电化学性能[J]. 电化学（中英文）, 2014, 20(6): 542-546.

LIN Xiao-chen , WU Xiao-biao , HOU Xu , YANG Yong*. Synthesis of NaMnPO₄ by Spraying Drying-High Temperature Sintering and Its Electrochemical Performance[J]. Journal of Electrochemistry, 2014, 20(6): 542-546.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.140416

https://electrochem.xmu.edu.cn/CN/Y2014/V20/I6/542

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喷雾干燥-高温烧结的NaMnPO₄制备及其电化学性能

Synthesis of NaMnPO₄ by Spraying Drying-High Temperature Sintering and Its Electrochemical Performance

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