LiNi_1/3Co_1/3Mn_1/3O₂ ternary cathode is a dominant cathode material for lithium ion batteries due to its relatively stable structure. However, LiNi_1/3Co_1/3Mn_1/3O₂ still suffers from the poor rate capability and high cation disorder problems. Herein, the Mg–doped Li(Ni_1/3Co_1/3Mn_1/3)_0.99Mg_0.01O₂ cathode materials with hollow flake–like hierarchical fiber structures are successfully synthesized by a facile wet spinning method and the pressing pretreatment of precursor powders on the electrochemical performance is also systematically investigated. The diameter of the pre−synthesized hollow laminar nano−fibers are about 20 μm and approximately 50 nm in thickness with homogeneous primary nanoparticles (∼50 nm). Benefitting from the pillaring effects of inert Mg in the crystal structure and hollow laminar structure, the Li(Ni_1/3Co_1/3Mn_1/3)_0.99Mg_0.01O₂ cathodes deliver significantly improved electrochemical performance, achieving high stability discharge specific capacity 178.8 mA h g⁻¹ with capacity retention of 88 % at 0.5 C (137.5 mA g⁻¹) rate after 200 cycles. Moreover, it maintains a high rate capacity of 110 mA h g⁻¹ even at a current density of 5 C. Based on this work, the conception of combining microstructure design and doping modification can facilitate the development of higher−performance Li−ion battery cathode materials.

中文翻译：

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Mg2 +掺杂的LiNi1 / 3Co1 / 3Mn1 / 3O2中空鳞片状结构，具有增强性能的锂离子电池阴极。

LiNi _1/3 Co _1/3 Mn _1/3 O ₂三元阴极由于其相对稳定的结构而成为锂离子电池的主要阴极材料。然而，LiNi _1/3 Co _1/3 Mn _1/3 O ₂仍然具有差的倍率能力和高阳离子紊乱问题。此处，Mg掺杂的Li（Ni _1/3 Co _1/3 Mn _1/3）_0.99 Mg _0.01 O ₂通过简便的湿纺方法成功地合成了具有空心鳞片状分层纤维结构的正极材料，并且还对前驱粉的加压预处理对电化学性能进行了系统研究。预合成的空心层状纳米纤维的直径约为20μm，厚度约为50 nm，且均质的原生纳米颗粒（约50 nm）。Li（Ni _1/3 Co _1/3 Mn _1/3）_0.99 Mg _0.01 O ₂得益于惰性Mg在晶体结构和中空层状结构中的立柱效应。阴极可显着改善电化学性能，实现200循环后，在0.5 C（137.5 mA g ^-1）速率下，高稳定性放电比容量为178.8 mA h g ^-1，容量保持率为88％。此外，即使在电流密度为5 C的情况下，它仍可保持110 mA h g ^-1的高倍率容量。基于这项工作，将微结构设计和掺杂改性相结合的构想可以促进高性能锂离子电池正极的开发材料。