钠锰比对NaxMnO2的性能和钠离子脱嵌过程的影响

doi:10.13208/j.electrochem.180207

电化学（中英文） ›› 2018, Vol. 24 ›› Issue (4): 375-384. doi: 10.13208/j.electrochem.180207

钠锰比对Na_xMnO₂的性能和钠离子脱嵌过程的影响

谢永纯¹，王成¹，蒋芳¹，杨洋¹，苏静^1,3,4，龙云飞¹，文衍宣^1,2,3,4*

1. 广西大学化学化工学院，广西南宁 530004；2. 广西高校新能源材料及相关技术重点实验室，广西南宁 530004；3. 广西新型电池材料工程技术研究中心，广西南宁 530004；4. 广西有色金属及特色材料加工重点实验室，广西南宁 530004

收稿日期:2018-02-07 修回日期:2018-03-26 出版日期:2018-08-28 发布日期:2018-04-25
通讯作者: 文衍宣 E-mail:wenyanxuan@vip.163.com
基金资助:
国家自然科学基金资助项目(No. 51564002)资助

Influences of Na-Mn Ratio on Electrochemical Performances and Intercalation-Deintercalation Processes of Sodium Ion in Na_xMnO₂

XIE Yong-chun¹, WANG Cheng¹, JIANG Fang¹, YANG Yang¹,SU Jing^1,3,4, LONG Yun-fei¹, WEN Yan-xuan^1,2,3,4*

1. School of Chemistry of and Chemical Engineering, Guangxi University, Nanning 530004, China;2. Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China; 3. Guangxi Novel Battery Materials Research Center of Engineering Technology, Nanning 530004, China; 4. Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Nanning 530004, China

Received:2018-02-07 Revised:2018-03-26 Published:2018-08-28 Online:2018-04-25
Contact: WEN Yan-xuan E-mail:wenyanxuan@vip.163.com
Supported by:
The National Natural Science Fund(No. 51564002)

摘要/Abstract

摘要：

采用高温固相法合成了Na_xMnO₂，并用X-射线衍射、X-射线光电子能谱、场发射扫描电镜、循环伏安、电化学阻抗谱和恒流充放电技术研究了钠锰比对材料的形态结构、电化学性能和钠离子脱嵌过程的影响. 结果表明，Na_xMnO₂ 主要由Na_0.7MnO₂ 和Na_0.91MnO₂ 组成，且Na_0.91MnO₂ 的量随着钠锰比的增加而增加. 随着钠锰比的增加，SEI 膜扩散、界面电化学反应和固相扩散的活化能先减少后增大，而材料的放电比容量则先增大后减少. 当钠锰比为0.80 时，合成的材料1C 倍率下首次放电比容量为152.8 mAh·g^-1，50 次循环容量保持率为80.6%，5C 大倍率下放电比容量为88.3 mAh·g^-1，表现出了良好的循环性能和倍率性，相应的SEI 膜扩散、界面电化学反应和固相扩散过程的活化能分别为68.23、40.07 和57.62 KJ·mol^-1.

关键词: 钠离子电池, 正极材料, Na_xMnO₂, 钠离子脱嵌

Abstract: In this work, Na_xMnO₂ was synthesized by a solid-state reaction. The influences of Na:Mn ratio on the structure, morphology and electrochemical performance, and sodium ion intercalation/deintercalation processes were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge test. The prepared Na_xMnO₂ was mainly composed of Na_0.7MnO₂ and Na_0.91MnO₂, and the content of Na_0.91MnO₂ increased with the increase of Na:Mn ratio. However, the activation energy values of surface membrane diffusion, interfacial electrochemical reaction and Na⁺ diffusion in the bulk material first decreased and then increased with the increase of Na:Mn ratio, while the discharge capability first increasedand then decreased with the increase of Na:Mn ratio. The sample synthesized with the Na:Mn ratio of 0.80 delivered a discharge capacity of 152.8 mAh·g^-1 with a capacity retention of 80.6% after 50 cycles at 1C. Even being charged/discharged at 5C, this sample still provided a discharge capacity of 88.3 mAh·g^-1, showing good cycle-stability and rate performance. The activation energy values of surface membrane diffusion, interfacial electrochemical reaction and solid-phase diffusion were found to be 68.23, 40.07 and 57.62 kJ·mol^-1, respectively.

Key words: sodium-ion battery, cathode, Na_xMnO₂, sodium-ion intercalation/deintercalation

中图分类号:

O646

谢永纯，王成，蒋芳，杨洋，苏静，龙云飞，文衍宣. 钠锰比对Na_xMnO₂的性能和钠离子脱嵌过程的影响[J]. 电化学（中英文）, 2018, 24(4): 375-384.

XIE Yong-chun, WANG Cheng, JIANG Fang, YANG Yang, SU Jing, LONG Yun-fei, WEN Yan-xuan. Influences of Na-Mn Ratio on Electrochemical Performances and Intercalation-Deintercalation Processes of Sodium Ion in Na_xMnO₂[J]. Journal of Electrochemistry, 2018, 24(4): 375-384.

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https://electrochem.xmu.edu.cn/CN/Y2018/V24/I4/375

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钠锰比对Na_xMnO₂的性能和钠离子脱嵌过程的影响

Influences of Na-Mn Ratio on Electrochemical Performances and Intercalation-Deintercalation Processes of Sodium Ion in Na_xMnO₂

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