Silyl-group functionalized organic additive for high voltage Ni-rich cathode material

被引：35

作者：

Jang, Seol Heui ^{[1
,2
]}

Jung, Kwangeun ^{[1
,2
]}

Yim, Taeeun ^{[1
,2
]}

机构：

[1] Incheon Natl Univ, Dept Chem, 119 Acad Ro, Incheon 406772, South Korea

[2] Incheon Natl Univ, Coll Nat Sci, Res Inst Basic Sci, 119 Acad Ro, Incheon 406772, South Korea

来源：

CURRENT APPLIED PHYSICS | 2018年 / 18卷 / 11期

基金：

新加坡国家研究基金会;

关键词：

Lithium ion battery; Silyl functional group; Electrolyte; Cathode; Additive; LITHIUM ION BATTERIES; ELECTROCHEMICAL PERFORMANCE; LIPF6-BASED ELECTROLYTES; THERMAL-DECOMPOSITION; VINYLENE CARBONATE; GRAPHITE ANODE; LI; SURFACE; SEI; INSTABILITY;

D O I：

10.1016/j.cap.2018.07.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To allow stable cycling of layered nickel-rich cathode material at high voltage, silyl-functionalized dimethoxydimethylsilane is proposed as a multi-functional additive. In contrast to typical functional additive, dimethoxydimethylsilane does not make artificial cathode-electrolyte interfaces by electrochemical oxidation because it is quite stable under anodic polarization. We find that dimethoxydimethylsilane mainly focuses on scavenging nucleophilic fluoride species that can be produced by electrolyte decomposition during cycling, leading to improving interfacial stability of both nickel-rich cathode and graphite anode. As a result, the cell cycled with dimethoxydimethylsilane-controlled electrolyte exhibits 65.7% of retention after 100 cycle, which is identified by systematic spectroscopic analyses for the cycled cell.

引用

页码：1345 / 1351

页数：7

共 49 条

[1] The state of understanding of the lithium-ion-battery graphite solid electrolyte interphase (SEI) and its relationship to formation cycling [J].