Synergistic effect of fluoroethylene carbonate and lithium difluorophosphate on electrochemical performance of SiC-based lithium-ion battery

被引：35

作者：

Zheng, Xiangzhen ^{[1
]}

Fang, Guihuang ^{[1
]}

Pan, Ying ^{[1
]}

Li, Qiaohong ^{[2
]}

Wu, Maoxiang ^{[1
]}

机构：

[1] Chinese Acad Sci, Fujian Inst Res Struct Matter, Key Lab Optoelect Mat Chem & Phys, Fuzhou 350002, Fujian, Peoples R China

[2] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2019年 / 439卷

基金：

中国国家自然科学基金;

关键词：

Lithium-ion battery; Electrolyte additive; Solid electrolyte interface; Fluoroethylene carbonate; Lithium difluorophosphate; VINYLENE CARBONATE; ELECTROLYTE ADDITIVES; MIXED ELECTROLYTES; AMORPHOUS-SILICON; CAPACITY FADE; FILM ANODE; COMPOSITE; CATHODE; NANOCOMPOSITE; NANOPARTICLES;

D O I：

10.1016/j.jpowsour.2019.227081

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Fluoroethylene carbonate (FEC) and lithium difluorophosphate (LiPO2F2) are evaluated as hybrid functional additives to improve the electrochemical performance of SiC-based lithium-ion batteries. When added to the electrolyte, FEC + LiPO2F2 significantly enhance the performance of SiC/Li cells. The capacity retention increases from 28.5% to 76.2% after 200 cycles. The effects of FEC + LiPO2F2 are characterized by charge discharge testing, electrochemical impedance spectroscopy, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. Combining the results of these analyses reveals that hybrid functional additives are beneficial for forming a uniform and thinner solid electrolyte interface film on the SiC surface. The solid electrolyte interface film derived from FEC + LiPO2F2 greatly inhibits particle pulverization and electrolyte decomposition, which play an important role in the performance of SiC-based cells.

引用

页数：9