Surface Engineering Strategies of Layered LiCoO2 Cathode Material to Realize High-Energy and High-Voltage Li-Ion Cells
- Authors
- Kalluri, Sujith; Yoon, Moonsu; Jo, Minki; Park, Suhyeon; Myeong, Seungjun; Kim, Junhyeok; Dou, Shi Xue; Guo, Zaiping; Cho, Jaephil
- Issue Date
- Jan-2017
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- high cut-off voltage; hybrid surface engineering; Li-ion cells; LiCoO2; structure-activity relationships
- Citation
- ADVANCED ENERGY MATERIALS, v.7, no.1
- Journal Title
- ADVANCED ENERGY MATERIALS
- Volume
- 7
- Number
- 1
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/89981
- DOI
- 10.1002/aenm.201601507
- ISSN
- 1614-6832
1614-6840
- Abstract
- Battery industries and research groups are further investigating LiCoO2 to unravel the capacity at high-voltages (>4.3 vs Li). The research trends are towards the surface modification of the LiCoO2 and stabilize it structurally and chemically. In this report, the recent progress in the surface-coating materials i.e., single-element, binary, and ternary hybrid-materials etc. and their coating methods are illustrated. Further, the importance of evaluating the surface-coated LiCoO2 in the Li-ion full-cell is highlighted with our recent results. Mg, P-coated LiCoO2 full-cells exhibit excellent thermal stability, high-temperature cycle and room-temperature rate capabilities with high energydensity of approximate to 1.4 W h cc(-1) at 10 C and 4.35 V. Besides, pouch-type full-cells with high-loading (18 mg cm(-2)) electrodes of layered-Li(Ni,Mn)O-2 -coated LiCoO2 not only deliver prolonged cycle-life at room and elevated-temperatures but also high energy-density of approximate to 2 W h cc(-1) after 100 cycles at 25 degrees C and 4.47 V (vs natural graphite). The post-mortem analyses and experimental results suggest enhanced electrochemical performances are attributed to the mechanistic behaviour of hybrid surface-coating layers that can mitigate undesirable side reactions and micro-crack formations on the surface of LiCoO2 at the adverse conditions. Hence, the surface-engineering of electrode materials could be a viable path to achieve the high-energy Li-ion cells for future applications.
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