Jingxi Li, Gemeng Liang*, Wei Zheng, Jinshuo Zou, Caoyu Wang, Jodie A Yuwono, Yameng Fan, Bernt Johannessen, Lars Thomsen, Sijiang Hu, Lei Jiang and Zaiping Guo*,
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引用次数: 0
摘要
由于其高能量密度,富镍层状氧化物已成为下一代锂离子电池最有前途的正极材料。然而,它们与应变相关的不稳定性,例如微裂纹和岩盐相的形成,对电池性能构成了重大威胁。在本研究中,我们通过高浓度的表面Ti掺杂,成功地用柔性TiO6八面体单元稳定了LiNi0.8Co0.1Mn0.1O2的结构。由于Ti4+中没有d电子,TiO6八面体可以容忍其他邻近结构单元的Jahn-Teller扭曲,使它们能够在局部区域内适应不希望的晶格扭曲,并减轻晶格应变/变化。与传统的增加层状结构刚度的方法相比,我们使用柔性TiO6结构单元的策略可以从根本上解决与应变相关的问题,有助于显著减少晶格变化,特别是沿着c方向(减少95.2%)。这种方法可以实现高电池容量(0.1 C时211.5 mAh g-1)和富镍阴极的长电池耐久性,超过市场上大多数商业产品。利用柔性结构单元稳定富镍层状氧化物的表面优化策略,由于层状结构正极材料之间的相似性,可以广泛应用于其他电池材料,以解决性能问题。
Structure Flexibility Enabled by Surface High-Concentration Titanium Doping for Durable Lithium-Ion Battery Cathodes
Ni-rich layered oxides have emerged as the most promising cathode materials for next-generation lithium-ion batteries due to their high energy densities. However, their strain-related instabilities, for example, microcracks and rock-salt phase formation, present a significant threat to battery performance. In this study, we successfully stabilize the structure of LiNi0.8Co0.1Mn0.1O2 using flexible TiO6 octahedron units through high-concentration surface Ti doping. The TiO6 octahedron can tolerate Jahn–Teller distortions of other neighboring structural units due to the absence of d electrons in Ti4+, allowing them to accommodate undesirable lattice distortions within the local domain and mitigate the lattice strain/changes. Compared with the conventional approach of increasing the rigidity of the layered structure, our strategy of using flexible TiO6 structural units can fundamentally address the strain-related issues, contributing to significantly reduced lattice changes, especially along the c-direction (by 95.2%). This approach enables a high battery capacity (211.5 mAh g–1 at 0.1 C) and long battery durability of Ni-rich cathodes, surpassing most commercial products on the market. The strategy of surface optimization using flexible structural units to stabilize Ni-rich layered oxides can be broadly applied to other battery materials to address performance issues due to the similarities among layered-structured cathode materials.
期刊介绍:
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