High-Rate and Cycling-Stable Nickel-Rich Cathode Materials with Enhanced Li+ Diffusion Pathway

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• 作者：Jun Tian ; Yuefeng Su ; Feng Wu ; Shaoyu Xu ; Fen Chen ; Renjie Chen ; Qing Li ; Jinghui Li ; Fengchun Sun ; Shi Chen
• 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：582-587
• 全文大小：458K
• ISSN：1944-8252

文摘

The nickel-rich LiNi<sub>0.7sub>Co<sub>0.15sub>Mn<sub>0.15sub>O<sub>2sub> material was sintered by Li source with the Ni<sub>0.7sub>Co<sub>0.15sub>Mn<sub>0.15sub>(OH)<sub>2sub> precursor, which was prepared via hydrothermal treatment after coprecipitation. The intensity ratio of I<sub>(110)sub>/I<sub>(108)sub> obtained from X-ray diffraction patterns and high-resolution transmission electronmicroscopy confirm that the particles have enhanced growth of (110), (100), and (010) surface planes, which supply superior inherent Li<sup>+sup> deintercalation/intercalation. The electrochemical measurement shows that the LiNi<sub>0.7sub>Co<sub>0.15sub>Mn<sub>0.15sub>O<sub>2sub> material has high cycling stability and rate capability, along with fast charge and discharge ability. Li<sup>+sup> diffusion coefficient at the oxidation peaks obtained by cyclic voltammogram measurement is as large as 10<sup>–11sup> (cm<sup>2sup> s<sup>–1sup>) orders of magnitude, implying that the nickel-rich material has high Li<sup>+sup> diffusion capability.