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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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Countering Voltage Decay and Capacity Fading of Lithium-Rich Cathode Material at 60 degrees C by Hybrid Surface Protection Layers

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Title
Countering Voltage Decay and Capacity Fading of Lithium-Rich Cathode Material at 60 degrees C by Hybrid Surface Protection Layers
Author
Liu, WenOh, PilgunLiu, XienMyeong, SeungjunCho, WoongraeCho, Jaephil
Issue Date
2015-07
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED ENERGY MATERIALS, v.5, no.13, pp.1500274
Abstract
Li-rich layered metal oxides have attracted much attention for their high energy density but still endure severe capacity fading and voltage decay during cycling, especially at elevated temperature. Here, facile surface treatment of Li1.17Ni0.17Co0.17Mn0.5O2 (0.4Li(2)MnO3 center dot 0.6LiNi(1/3)Co(1/3)Mn(1/3)O(2)) spherical cathode material is designed to address these drawbacks by hybrid surface protection layers composed of Mg2+ pillar and Li-Mg-PO4 layer. As a result, the surface coated Li-rich cathode material exhibits much enhanced cycling stability at 60 degrees C, maintaining 72.6% capacity retention (180 mAh g(-1)) between 3.0 and 4.7 V after 250 cycles. More importantly, 88.7% average discharge voltage retention can be obtained after the rigorous cycle test. The strategy developed here with novel hydrid surface protection effect can provide a vital approach to inhibit the undesired side reactions and structural deterioration of Li-rich cathode materials and may also be useful for other layered oxides to increase their cycling stability at elevated temperature
URI
https://scholarworks.unist.ac.kr/handle/201301/16407
URL
http://onlinelibrary.wiley.com/doi/10.1002/aenm.201500274/abstract
DOI
10.1002/aenm.201500274
ISSN
1614-6832
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