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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Surface Mn Oxidation State Controlled Spinel LiMn2O4 as a Cathode Material for High-Energy Li-Ion Batteries

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Title
Surface Mn Oxidation State Controlled Spinel LiMn2O4 as a Cathode Material for High-Energy Li-Ion Batteries
Author
Jeong, MinseulLee, Min-JoonCho, JaephilLee, Sanghan
Issue Date
2015-07
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED ENERGY MATERIALS, v.5, no.13, pp.1500440
Abstract
Spinel lithium manganese oxide (LiMn2O4) has attracted much attention as a promising cathode material for large-scale lithium ion batteries. However, its continuous capacity fading at elevated temperature is an obstacle to extended cycling in large-scale applications. Here, surface Mn oxidation state controlled LiMn2O4 is synthesized by coating stoichiometric LiMn2O4 with a cobalt-substituted spinel, for which stoichiometric LiMn2O4 is used as the starting material and onto which a LixMnyCozO4 layer is coated from an acetate-based precursor solution. In the coated material, the concentrations of both cobalt and Mn4+ ions vary from the surface to the core. the former without any lattice mismatch between the coating layer and host material. Cycle tests are performed under severe conditions, namely, high temperature and intermittent high current load. During the first discharge cycle at 7 C and 60 degrees C, a high energy and power density are measured for the coated material, 419 and 3.16 Wh kg(-1), respectively, compared with 343 and 3.03 Wh kg(-1), respectively, for the bare material. After 65 cycles under severe conditions, the coated material retains 82% and approximate to 100% of the initial energy and power density, respectively, whereas the bare material retains only approximate to 68% and approximate to 97% thereof
URI
https://scholarworks.unist.ac.kr/handle/201301/16403
URL
http://onlinelibrary.wiley.com/doi/10.1002/aenm.201500440/abstract
DOI
10.1002/aenm.201500440
ISSN
1614-6832
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