Magnesium Borate Fiber Coating Separators with High Lithium-Ion Transference Number for Lithium-Ion Batteries

被引：17
|
作者：
Wang, Xin [1 ]
Peng, Longqing [1 ]
Hua, Haiming [1 ]
Liu, Yizheng [2 ]
Zhang, Peng [2 ]
Zhao, Jinbao [1 ,2 ]
机构：
[1] Xiamen Univ, Collaborat Innovat Ctr Chem Energy Mat, Coll Chem & Chem Engn,State Key Lab Phys Chem Sol, Engn Res Ctr Electrochem Technol,Minist Educ,Stat, Xiamen 361005, Peoples R China
[2] Xiamen Univ, Coll Energy, Xiamen 361005, Peoples R China
来源：
CHEMELECTROCHEM | 2020年 / 7卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Lithium ion battery; Mg2B2O5; fibers; Lithium ion transference number; SOLID POLYMER ELECTROLYTES; ATOMIC LAYER DEPOSITION; ELECTROCHEMICAL PROPERTIES; POLYETHYLENE SEPARATORS; CONDUCTIVITY; GROWTH; ESTER; BORON;
D O I：
10.1002/celc.201901916
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
In this work, magnesium borate fiber (MBO) is used as a functional ceramic to coat onto a polypropylene (PP) separator (MBO@PP). This MBO coating layer increases the lithium-ion transference number (t(Li+)) from 0.24 to 0.57 in the LiPF6-based electrolyte due to the MBO acting as Lewis acid sites interacts with Lewis base PF6- . The increase in the t(Li+) reduces the concentration polarization and promotes the migration of lithium ions. Besides, the prepared MBO@PP separator has better wettability with liquid electrolyte, the electrolyte uptake as well as thermal stability. The LiFePO4 half-coin with MBO@PP separator not only had better cycle stability, but also had a higher capacity retention rate at high current.
引用
收藏
页码：1187 / 1192
页数：6
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