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Jung, Yoon Seok
Electrochemical Solid-State Energy Storage Lab
Research Interests
  • Batteries, All-solid-state batteries, solid electrolytes, electrodes, atomic layer deposition,energy storage devices

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Ion-Exchangeable Functional Binders and Separator for High Temperature Performance of Li1.1Mn1.86Mg0.04O4 Spinel Electrodes in Lithium Ion Batteries

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Title
Ion-Exchangeable Functional Binders and Separator for High Temperature Performance of Li1.1Mn1.86Mg0.04O4 Spinel Electrodes in Lithium Ion Batteries
Author
Woo, Seung HeeLim, Hyung-WooJeon, SangbinTravis, Jonathan J.George, Steven M.Lee, Se-HeeJo, Yong NamSong, Jun HoJung, Yoon SeokHong, Sung YouChoi, Nam-SoonLee, Kyu Tae
Keywords
ATOMIC LAYER DEPOSITION; LI-ION; STRUCTURAL-CHANGES; CATHODE MATERIALS; MANGANESE OXIDES; CAPACITY LOSSES; LIMN2O4; CELLS; 60-DEGREES-C; DEGRADATION
Issue Date
2013-10
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.160, no.11, pp.A2234 - A2243
Abstract
Since LiMn2O4 spinel materials are inexpensive, environmentally-friendly, and safe, they are considered a promising cathode candidate for lithium ion batteries in EVs to replace commercialized materials such as LiCoO2, LiNi1/3Mn1/3Co1/3O2 and LiNi0.5Co0.2Mn0.3O2. However, LiMn2O4 spinel electrodes severely degrade at high temperature due to Mn dissolution. Also, the dissolved Mn2+ ions causes self-discharge where reduction of Mn2+ ions into Mn metals occurs on a graphite anode surface accompanied by oxidation of lithiated graphite at a charged state, and this results in severe capacity fading at high temperature. In this study, ion-exchangeable binders and a separator having functional groups of sodium carboxylate or sulfonate are, for the first time, examined to solve the Mn dissolution problem of LiMn2O4 spinel materials at high temperature. Ion exchange between Na+ ions of the functional groups of the binders and the separator and dissolved Mn2+ ions of the LiMn2O4 electrodes inhibits self-discharge, resulting in improved cycle performance. This result is supported by the IR spectra of the binders, an ICP analysis of the electrolytes, and ex situ XRD patterns of lithiated graphite electrodes.
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DOI
10.1149/2.092311jes
ISSN
0013-4651
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ECHE_Journal Papers
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