Concentrated LiPF6/PC electrolyte solutions for 5-V LiNi0.5Mn1.5O4 positive electrode in lithium-ion batteries

被引：80
作者：
Doi, Takayuki [1 ]
Masuhara, Rin [1 ]
Hashinokuchi, Michihiro [1 ]
Shimizu, Yusuke [1 ]
Inaba, Minoru [1 ]
机构：
[1] Doshisha Univ, Dept Mol Chem & Biochem, 1-3 Tataramiyakodani, Kyoto 6100321, Japan
来源：
ELECTROCHIMICA ACTA | 2016年 / 209卷
关键词：
LiNi0.5Mn1.5O4; High-potential positive electrode; Concentrated electrolyte; Propylene carbonate; Lithium-ion battery; IN-SALT ELECTROLYTE; HIGH-VOLTAGE; ELECTROCHEMICAL PERFORMANCE; SUPERCONCENTRATED ELECTROLYTES; STABILITY; CATHODE; SURFACE; SPINEL; SOLVATION; GRAPHITE;
D O I：
10.1016/j.electacta.2016.05.062
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Charge and discharge properties of spinel LiNi0.5Mn1.5O4 positive electrodes were investigated using propylene carbonate (PC)-based concentrated electrolyte solutions in the range of 0.83 (ca. 1 mol dm(-3)) to 4.45 (nearly saturated) mol kg(-1). The solvation state of PC in the concentrated electrolyte solution was studied by Raman spectroscopy. The HOMO energy of PC in Li+(PC)(n) was evaluated by first-principle calculation to assess the oxidative stability of PC molecules solvating lithium ion. Charge and discharge measurements revealed that the irreversible capacity due to solvent decomposition decreased with increasing the concentration of LiPF6, while discharge capacity increased. In addition, cycle performance of LiNi0.5Mn1.5O4 positive electrodes was remarkably improved by the use of graphitized Ketjenblack as a conductive additive. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：219 / 224
页数：6
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