Mechanical integrity issues of Ni-rich cathode materials are major bottlenecks for their commercial application, stemming from the abrupt anisotropic lattice contraction during H2 ↔ H3 phase transitions. Herein, zirconium is used to modify LiNiCoMnO to solve the mechanical integrity issues. The relationship between the mechanical integrity issues and electrochemical performance is systematically examined to gain insights into the Zr activity-governing mechanisms. Results find that the addition of zirconium not only improves the diffusion ability of lithium ions by providing a rapid channel for diffusion of lithium ions, but also enhances mechanical properties by inhibiting cation mixing. As a result, the optimal LiNiCoMnO achieves superiority capacity retention of 84.12 % after 200 cycles at 5C, higher than that of unmodified LiNiCoMnO 74.32 %. This work deeply investigates the information on the bulk structure and interaction mechanism between substitution cations and Ni-rich layered oxides, which provides a new insight to design and construct of advanced high-capacity cathode materials.

中文翻译：

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富镍层状正极材料的化学改性提高电池寿命

富镍正极材料的机械完整性问题是其商业应用的主要瓶颈，源于 H2 ↔ H3 相变期间突然的各向异性晶格收缩。在此，使用锆对LiNiCoMnO进行改性以解决机械完整性问题。系统地检查机械完整性问题和电化学性能之间的关系，以深入了解 Zr 活性控制机制。结果发现，锆的添加不仅通过提供锂离子的快速扩散通道来提高锂离子的扩散能力，而且通过抑制阳离子混合来增强机械性能。结果，优化的LiNiCoMnO在5C下循环200次后实现了84.12%的优越容量保持率，高于未改性的LiNiCoMnO 74.32%。这项工作深入研究了取代阳离子与富镍层状氧化物之间的体结构和相互作用机制的信息，为先进高容量正极材料的设计和构建提供了新的见解。