Issue 3, 2017
From the journal:

Journal of Materials Chemistry A

New promising lithium malonatoborate salts for high voltage lithium ion batteries†

Xiao-Guang Sun,*a   Shun Wan,a   Hong Yu Guang,ab   Youxing Fang,ac   Kimberly Shawn Reeves,d   Miaofang Chid  and  Sheng Daiac  

* Corresponding authors

a Chemical Sciences Division, Oak Ridge National Laboratory, One Bethel Valley Road, Oak Ridge, TN 37831, USA
E-mail: sunx@ornl.gov

b Department of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun, Jilin 130012, P. R. China

c Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA

d Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, One Bethel Valley Road, Oak Ridge, TN 37831, USA

Abstract

Three new lithium salts, lithium difluoro-2-methyl-2-fluoromalonatoborate (LiDFMFMB), lithium difluoro-2-ethyl-2-fluoromalonatoborate (LiDFEFMB), and lithium difluoro-2-propyl-2-fluoromalonatoborate (LiDFPFMB), have been synthesized and evaluated for application in lithium ion batteries. These new salts are soluble in a mixture of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) (1 : 2 by wt) and 1.0 M salt solutions can be easily prepared. The ionic conductivities of these new salts are close to those of LiBF4 and LiPF6. Cyclic voltammograms reveal that these new salt based electrolytes can passivate both natural graphite and high voltage spinel LiNi0.5Mn1.5O4 (LNMO) to form effective solid electrolyte interphases (SEIs). In addition, these new salt-based electrolytes exhibit good cycling stability with high coulombic efficiencies in both LiNi0.5Mn1.5O4 and graphite based half-cells and full cells.

Graphical abstract: New promising lithium malonatoborate salts for high voltage lithium ion batteries

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Article information

DOI
https://doi.org/10.1039/C6TA07757A
Article type
Paper
Submitted
07 Sep 2016
Accepted
24 Nov 2016
First published
01 Dec 2016

J. Mater. Chem. A, 2017,5, 1233-1241

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New promising lithium malonatoborate salts for high voltage lithium ion batteries

X. Sun, S. Wan, H. Y. Guang, Y. Fang, K. S. Reeves, M. Chi and S. Dai, J. Mater. Chem. A, 2017, 5, 1233 DOI: 10.1039/C6TA07757A

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