FEC 基电解液对高压正极材料 Li2CoPO4F 电化学性能的影响

doi:10.13208/j.electrochem.170509

电化学（中英文） ›› 2018, Vol. 24 ›› Issue (3): 216-226. doi: 10.13208/j.electrochem.170509

FEC 基电解液对高压正极材料 Li₂CoPO₄F 电化学性能的影响

王志刚¹，赵卫民¹，王红春¹，林敏¹，龚正良^1*，杨勇^1,2*

1. 厦门大学能源学院, 福建厦门 361005; 2. 固体表面物理化学国家重点实验室, 厦门大学化学化工学院, 福建厦门 361005

收稿日期:2017-05-11 修回日期:2017-06-06 出版日期:2018-06-28 发布日期:2017-06-09
通讯作者: 龚正良，杨勇 E-mail:zlgong@xmu.edu.cn, yyang@xmu.edu.cn
基金资助:
福建省自然科学基金项目（No.2014J05019）、国家自然科学基金项目（No.21233004，No.21303147）和厦门大学校长基金（No. 20720150090）资助

Influences of FEC-based Electrolyte on Electrochemical Performance of High Voltage Cathode Material Li₂CoPO₄F

WANG Zhi-gang¹, ZHAO Wei-min¹, WANG Hong-chun¹, LIN Min¹, GONG Zheng-liang^1*, YANG Yong^1,2*

1.College of Energy，Xiamen University，Xiamen 361005，Fujian，China；2. State Key Lab of Physical Chemistry of Solid Surfaces，and College of Chemistry & Chemical Engineering，Xiamen University，Xiamen 361005，Fujian，China

Received:2017-05-11 Revised:2017-06-06 Published:2018-06-28 Online:2017-06-09
Contact: GONG Zheng-liang, YANG Yong E-mail:zlgong@xmu.edu.cn, yyang@xmu.edu.cn

摘要/Abstract

摘要：

本文研究了以氟代碳酸乙烯酯FEC（fluoroethylene carbonate）为共溶剂的电解液对高压正极材料 Li₂CoPO₄F 电化学性能的影响，与碳酸酯基电解液1 mol·L^-1 LiPF₆EC/DMC=1:1（m:m）相比，1 mol·L^-1 LiPF₆FEC/DMC=1:1（m:m）可显著提高Li₂CoPO₄F的循环稳定性. 通过线性扫描伏安法（LSV）、扫描电镜（SEM）、X射线光电子能谱（XPS）、X射线衍射（XRD）结合电化学阻抗（EIS）对 FEC 改善 Li₂CoPO₄F 材料循环稳定性的机理进行了探索，结果表明与传统碳酸酯基电解液相比，FEC 基电解液在高压下有着优异的抗氧化性，能够有效抑制电解液的氧化分解. 同时，FEC 基电解液中形成的表面膜具有更高的稳定性，能够抑制电极/电解液界面副反应的发生，提高循环过程中电极材料结构稳定性，从而有益于提高 Li₂CoPO₄F 材料的电化学性能.

关键词: 锂离子电池, 高压电解液, 氟代碳酸乙烯酯, 氟磷酸钴锂

Abstract:

The effects of fluoroethylene carbonate (FEC) as co-solvent on the electrochemical performance of high voltage cathode material Li₂CoPO₄F are investigated. Compared with traditional carbonate based electrolyte (1 mol·L^-1 LiPF₆ EC/DMC (1:1, m:m)), the FEC/DMC based electrolyte can significantly improved the electrochemical performance of Li₂CoPO₄F. After 100 cycles between 3V and 5.4 V at 1 C rate, the capacity retention of Li₂CoPO₄F electrode in 1 mol·L^-1 LiPF₆ EC/DMC (1:1, m:m) was 52.6 % , while that in the EC/DMC based electrolyte was only 14.5 %. Possible functional mechanisms of FEC improving the electrochemical performance of Li₂CoPO₄F were studied by LSV, EIS, SEM and XPS measurements. It was shown that compared with the traditional EC/DMC based electrolyte, the FEC/DMC based electrolyte exhibited higher stability at high voltage, which suppressed the side reactions at electrode/electrolyte interface when charged to high voltage, and improved the structure stability of Li₂CoPO₄F during cycling, thus, significantly enhanced the electrochemical performance of Li₂CoPO₄F.

Key words: lithium ion battery, high voltage electrolytes; fluoroethylene carbonate; Li₂CoPO₄F

中图分类号:

O646

王志刚，赵卫民，王红春，林敏，龚正良，杨勇. FEC 基电解液对高压正极材料 Li₂CoPO₄F 电化学性能的影响[J]. 电化学（中英文）, 2018, 24(3): 216-226.

WANG Zhi-gang, ZHAO Wei-min, WANG Hong-chun, LIN Min, GONG Zheng-liang, YANG Yong. Influences of FEC-based Electrolyte on Electrochemical Performance of High Voltage Cathode Material Li₂CoPO₄F[J]. Journal of Electrochemistry, 2018, 24(3): 216-226.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.170509

https://electrochem.xmu.edu.cn/CN/Y2018/V24/I3/216

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FEC 基电解液对高压正极材料 Li₂CoPO₄F 电化学性能的影响

Influences of FEC-based Electrolyte on Electrochemical Performance of High Voltage Cathode Material Li₂CoPO₄F

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