具有增强锂离子扩散路径的高倍率和循环稳定的富镍正极材料。
High-Rate and Cycling-Stable Nickel-Rich Cathode Materials with Enhanced Li(+) Diffusion Pathway.
作者信息
Tian Jun, Su Yuefeng, Wu Feng, Xu Shaoyu, Chen Fen, Chen Renjie, Li Qing, Li Jinghui, Sun Fengchun, Chen Shi
机构信息
School of Material Science and Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology , Beijing 100081, P. R. China.
Collaborative Innovation Center for Electric Vehicles in Beijing, Beijing 100081, P. R. China.
出版信息
ACS Appl Mater Interfaces. 2016 Jan 13;8(1):582-7. doi: 10.1021/acsami.5b09641. Epub 2015 Dec 24.
The nickel-rich LiNi0.7Co0.15Mn0.15O2 material was sintered by Li source with the Ni0.7Co0.15Mn0.15(OH)2 precursor, which was prepared via hydrothermal treatment after coprecipitation. The intensity ratio of I(110)/I(108) 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(+) deintercalation/intercalation. The electrochemical measurement shows that the LiNi0.7Co0.15Mn0.15O2 material has high cycling stability and rate capability, along with fast charge and discharge ability. Li(+) diffusion coefficient at the oxidation peaks obtained by cyclic voltammogram measurement is as large as 10(-11) (cm(2) s(-1)) orders of magnitude, implying that the nickel-rich material has high Li(+) diffusion capability.
富镍LiNi0.7Co0.15Mn0.15O2材料由锂源与Ni0.7Co0.15Mn0.15(OH)2前驱体烧结而成，该前驱体是通过共沉淀后水热处理制备的。从X射线衍射图谱和高分辨率透射电子显微镜获得的I(110)/I(108)强度比证实，颗粒的(110)、(100)和(010)表面平面生长增强，这提供了优异的固有Li(+)脱嵌/嵌入性能。电化学测量表明，LiNi0.7Co0.15Mn0.15O2材料具有高循环稳定性和倍率性能，以及快速充放电能力。通过循环伏安法测量在氧化峰处的Li(+)扩散系数高达10(-11)(cm(2)s(-1))数量级，这意味着富镍材料具有高Li(+)扩散能力。
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