Surface Engineering Strategies of Layered LiCoO<sub>2sub> Cathode Material to Realize High-Energy and High-Voltage Li-Ion Cells
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- 作者：Sujith Kalluri ; Moonsu Yoon ; Minki Jo ; Suhyeon Park ; Seungjun Myeong ; Junhyeok Kim ; Shi Xue Dou ; Zaiping Guo and Jaephil Cho
- 刊名：Advanced Energy Materials
- 出版年：2017
- 出版时间：January 11, 2017
- 年：2017
- 卷：7
- 期：1
- 全文大小：5721K
- ISSN：1614-6840
文摘
Battery industries and research groups are further investigating LiCoO<sub>2sub> to unravel the capacity at high-voltages (>4.3 vs Li). The research trends are towards the surface modification of the LiCoO<sub>2sub> 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 LiCoO<sub>2sub> in the Li-ion full-cell is highlighted with our recent results. Mg,P-coated LiCoO<sub>2sub> full-cells exhibit excellent thermal stability, high-temperature cycle and room-temperature rate capabilities with high energy-density of ≈1.4 W h cc<sup>−1sup> at 10 C and 4.35 V. Besides, pouch-type full-cells with high-loading (18 mg cm<sup>−2sup>) electrodes of layered-Li(Ni,Mn)O<sub>2sub> -coated LiCoO<sub>2sub> not only deliver prolonged cycle-life at room and elevated-temperatures but also high energy-density of ≈2 W h cc<sup>−1sup> after 100 cycles at 25 °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 LiCoO<sub>2sub> 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.