Layered-Layered-Spinel Cathode Materials Prepared by a High-Energy Ball-Milling Process for Lithium-ion Batteries

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• 作者：Soo Kim ; Jae-Kyo Noh ; Muratahan Aykol ; Zhi Lu ; Haesik Kim ; Wonchang Choi ; Chunjoong Kim ; Kyung Yoon Chung ; Chris Wolverton ; Byung-Won Cho
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：January 13, 2016
• 年：2016
• 卷：8
• 期：1
• 页码：363-370
• 全文大小：669K
• ISSN：1944-8252

文摘

In this work, we report the electrochemical properties of 0.5Li₂MnO₃·0.25LiNi_0.5Co_0.2Mn_0.3O₂·0.25LiNi_0.5Mn_1.5O₄ and 0.333Li₂MnO₃·0.333LiNi_0.5Co_0.2Mn_0.3O₂·0.333LiNi_0.5Mn_1.5O₄ layered-layered-spinel (L*LS) cathode materials prepared by a high-energy ball-milling process. Our L*LS cathode materials can deliver a large and stable capacity of ～200 mAh?g^?1 at high voltages up to 4.9 V, and do not show the anomalous capacity increase upon cycling observed in previously reported three-component cathode materials synthesized with different routes. Furthermore, we have performed synchrotron-based in situ X-ray diffraction measurements and found that there are no significant structural distortions during charge/discharge runs. Lastly, we carry out (opt-type) van der Waals-corrected density functional theory (DFT) calculations to explain the enhanced cycle characteristics and reduced phase transformations in our ball-milled L*LS cathode materials. Our simple synthesis method brings a new perspective on the use of the high-power L*LS cathodes in practical devices.