二氟草酸硼酸钠作为钠离子电池非水电解液添加剂的电化学性能

doi:10.13208/j.electrochem.160703

电化学（中英文） ›› 2017, Vol. 23 ›› Issue (4): 473-479. doi: 10.13208/j.electrochem.160703

二氟草酸硼酸钠作为钠离子电池非水电解液添加剂的电化学性能

张鼎¹，朱芹¹，王瑛²，赵成龙²，刘世斌¹，徐守冬¹*

1. 太原理工大学化学化工学院，山西太原 030024; 2. 山东玉皇新能源科技有限公司，山东菏泽 274000

收稿日期:2016-07-03 修回日期:2016-08-25 出版日期:2017-08-25 发布日期:2016-11-02
通讯作者: 徐守冬 E-mail:xushoudong@tyut.edu.cn
基金资助:
国家自然科学基金(No.21506141)，山西省自然科学基金(No.2015021131, No.201601021040)资助项目

Electrochemical Performance of Sodium Difluoro(oxalato)borate as the Additive of Non-aqueous Electrolytes for Sodium-ion Batteries

ZHANG Ding¹, Zhu Qin¹, WANG Ying², ZHAO Cheng-long², LIU Shi-bin¹, XU Shou-dong¹*

1 College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi Province, 030024, P. R. China; 2 Shandong Yuhuang New Energy Technology Co. Ltd. Heze274000, Shandong Province, P. R. China

Received:2016-07-03 Revised:2016-08-25 Published:2017-08-25 Online:2016-11-02
Contact: XU Shou-dong E-mail:xushoudong@tyut.edu.cn

摘要/Abstract

摘要：

引入电解液添加剂是提升钠离子二次电池电化学性能的重要途径.本论文制备了二氟草酸硼酸钠（NaDFOB）并作为NaClO₄/碳酸乙烯酯（EC）/碳酸丙烯酯（PC）（ EC:PC体积比=1:1）非水电解液的添加剂，分别考察了其加入量对于电导率特性、电化学氧化分解电压的影响，以及应用于NaNi_0.5Mn_0.5O₂半电池的电化学性能. 结果表明，NaDFOB作为添加剂时对于NaClO₄/EC/PC电解液电导率提升不明显，但是显著提升了电解液的氧化分解电压；以添加0.025 mol·L^-1 NaDFOB的电解液应用于NaNi_0.5Mn_0.5O₂半电池时，首周不可逆比容量由22 mAh·g^-1下降到9 mAh·g^-1，同时0.2C倍率下循环200周容量保持率由44.4% 提升到89.5%，平均每周容量衰减为0.06 mAh·g^-1. 因此，NaDFOB可以作为钠离子电池非水电解液的一种有效添加剂.

关键词: 钠离子电池, 非水电解液, 电解液添加剂, 二氟草酸硼酸钠, 镍锰酸钠

Abstract:

Sodium ion battery has attracted worldwide and intensive attention recently, while the adoption of electrolyte additives has been considered as one effective strategy to promote the cell performance. Within this work sodium difluoro(oxalato)borate (NaDFOB) was prepared and adopted as an additive for the general non-aqueous electrolyte formula of 1 mol·L^-1 NaClO₄/EC/PC (Vol: Vol=1:1), and the effects of the additive concentration on ionic conductivity and oxidization decomposition voltage were investigated in detail. In addition, the cell performance evaluated by NaNi_0.5Mn_0.5O₂as the cathode was also studied. It reveals that the addition of NaDFOB into the NaClO₄/EC/PC electrolyte resulted in the significantly increased oxidation decomposition voltages from 4.6 V to 4.85 V, in spite of the slightly increased ionic conductivity, attributed to extra dissociated sodium salt NaDFOB. When the 0.025 mol·L^-1 NaDFOB added electrolyte was used to support the operation of NaNi_0.5Mn_0.5O₂ cathode, the initial irreversible capacity decreased from 22 mAh·g^-1 to 9 mAh·g^-1, and the capacity retention upon 200 cycles at 0.2 C-rate increased from 44.4% to 89.5%, with an average capacity fade of 0.06 mAh·g^-1 per cycle. Therefore, the NaDFOB was proved to be an effective electrolyte additive for non-aqueous sodium ion batteries.

Key words: Sodium-ion batteries, non-aqueous electrolyte, electrolyte additive, NaDFOB; NaNi_0.5Mn_0.5O₂

中图分类号:

O646

张鼎，朱芹，王瑛，赵成龙，刘世斌，徐守冬. 二氟草酸硼酸钠作为钠离子电池非水电解液添加剂的电化学性能[J]. 电化学（中英文）, 2017, 23(4): 473-479.

ZHANG Ding, Zhu Qin, WANG Ying, ZHAO Cheng-long, LIU Shi-bin, XU Shou-dong. Electrochemical Performance of Sodium Difluoro(oxalato)borate as the Additive of Non-aqueous Electrolytes for Sodium-ion Batteries[J]. Journal of Electrochemistry, 2017, 23(4): 473-479.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.160703

https://electrochem.xmu.edu.cn/CN/Y2017/V23/I4/473

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二氟草酸硼酸钠作为钠离子电池非水电解液添加剂的电化学性能

Electrochemical Performance of Sodium Difluoro(oxalato)borate as the Additive of Non-aqueous Electrolytes for Sodium-ion Batteries

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