钠离子电池正极材料VOPO4·2H2O纳米片的合成与电化学性能

doi:10.19799/j.cnki.2095-4239.2020.0087

储能科学与技术 ›› 2020, Vol. 9 ›› Issue (5): 1410-1415.doi: 10.19799/j.cnki.2095-4239.2020.0087

钠离子电池正极材料VOPO₄·2H₂O纳米片的合成与电化学性能

张香华¹(), 骆微¹, 芮先宏¹(), 余彦²()

^1.广东工业大学材料与能源学院，广东广州 510080
^2.中国科学技术大学材料科学与工程系，安徽合肥 230026

收稿日期:2020-03-01 修回日期:2020-03-15 出版日期:2020-09-05 发布日期:2020-09-08
通讯作者: 芮先宏,余彦 E-mail:1633202916@qq.com;xhrui@gdut.edu.cn;yanyumse@ustc.edu.cn
作者简介:张香华（1992—），女，博士研究生，研究方向为钠离子电池电极材料，E-mail：1633202916@qq.com；
基金资助:
国家自然科学基金项目(51972067)

Preparation and electrochemical performance of VOPO₄·2H₂O nanosheet cathode for sodium-ion batteries

Xianghua ZHANG¹(), Wei LUO¹, Xianhong RUI¹(), Yan YU²()

^1.School of Materials and Energy, Guangdong University of Technology, Guangzhou 510080, Guangdong, China
^2.Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, Anhui, China

Received:2020-03-01 Revised:2020-03-15 Online:2020-09-05 Published:2020-09-08
Contact: Xianhong RUI,Yan YU E-mail:1633202916@qq.com;xhrui@gdut.edu.cn;yanyumse@ustc.edu.cn

摘要/Abstract

摘要：

VOPO₄·2H₂O具有二维层状结构，有利于钠离子的存储及快速迁移，适合用作钠离子电池正极材料。本文利用水热法成功制备出了VOPO₄·2H₂O纳米片（厚度约10 nm）正极材料。借助材料表征手段、电化学分析技术等对VOPO₄·2H₂O纳米片正极材料的微观形貌和电化学性能进行了系统研究。结果表明，VOPO₄·2H₂O纳米片显微结构均匀，用作钠离子电池正极材料时，表现出较高的可逆比容量和优异的倍率性能及循环稳定性。0.05 C时，平均工作电压可达3.5 V，可逆比容量为130 mA·h/g；在5 C高倍率下，可逆比容量可达70 mA·h/g，循环400 圈后，容量保持率为77%。VOPO₄·2H₂O的纳米片状结构可以有效促进钠离子的快速嵌入和脱出，使其具有较快的电化学反应动力学特性，从而表现出优异的储钠性能。

关键词: 钠离子电池, 正极材料, VOPO₄·2H₂O, 纳米片

Abstract:

VOPO₄·2H₂O is thought to be a promising cathode material for sodium-ion batteries (SIBs) owing to its typical two-dimensional layered structure, which facilitates rapid sodium transportation. Here, a cathode constructed of VOPO₄·2H₂O nanosheets (thickness: ~10 nm) was successfully prepared via a simple hydrothermal method. The corresponding morphology and electrochemical properties of the cathode were systematically analyzed. The as-prepared VOPO₄·2H₂O nanosheets were very uniform, and when used as the SIB cathode, it displayed an excellent electrochemical performance including high reversible specific capacity, excellent rate capability and good cycling stability. For example, the VOPO₄·2H₂O nanosheet cathode showed a high average operating voltage of 3.5 V and a reversible capacity of 130 mA·h/g at a rate of 0.05 C. Even at a high rate of 5 C, the cathode could still obtain a capacity of 70 mA·h/g and a retention of 77% was maintained after 400 cycles. This outstanding sodium storage performance is primarily due to the advantages of its unique nanosheet structure, which promotes rapid sodium diffusion.

Key words: sodium ion battery, cathode material, VOPO₄·2H₂O, nanosheet

中图分类号:

TQ 028.8

张香华, 骆微, 芮先宏, 余彦. 钠离子电池正极材料VOPO₄·2H₂O纳米片的合成与电化学性能[J]. 储能科学与技术, 2020, 9(5): 1410-1415.

Xianghua ZHANG, Wei LUO, Xianhong RUI, Yan YU. Preparation and electrochemical performance of VOPO₄·2H₂O nanosheet cathode for sodium-ion batteries[J]. Energy Storage Science and Technology, 2020, 9(5): 1410-1415.

图/表 7

图1

图2

图3

图4

图5

图6

表1

VOPO4·2H2O正极材料的动力学数据"

样品	R_b/Ω	R_ct/Ω	$D N a +$ /cm²·s^-1
VOPO₄·2H₂O 纳米片	4.0	186	1.8×10^-13
块体 VOPO₄·2H₂O	5.0	317	1.0×10^-13

表1

参考文献 30

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钠离子电池正极材料VOPO₄·2H₂O纳米片的合成与电化学性能

Preparation and electrochemical performance of VOPO₄·2H₂O nanosheet cathode for sodium-ion batteries

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