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

作者：Tian, Jun; Su, Yuefeng^*; Wu, Feng^*; Xu, Shaoyu; Chen, Fen; Chen, Renjie; Li, Qing; Li, Jinghui; Sun, Fengchun; Chen, Shi

来源：ACS Applied Materials & Interfaces, 2016, 8(1): 582-587.

DOI：10.1021/acsami.5b09641

• lithium-ion batteries
• nickel-rich layered material
• Li+ transportation
• cycling stability
• rate capability

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.

• 出版日期2016-1-13
• 单位北京理工大学