High-density sintered plate-type cathodes composed of only an active material can achieve a high energy density of lithium-ion batteries (LIBs) beyond the current state of the art. However, slow lithium ion movement in the solid-state cathode plate and deterioration of the grain boundary of sintered cathodes over many charge/discharge cycles are obstacles to commercialization. Herein, we present a new three-dimensional high-density sintered LiCoO2 plate cathode with periodically aligned channels, which enable fast charging/discharging of high-energy-density LIBs. In addition, we investigate the grain-boundary cracking mechanism and introduce a conductive coating agent to LiCoO2 cathodes that prevents crack propagation, enhances electron transfer between sintered LiCoO2 grains, and prevents the formation of an undesirable cathode electrolyte interphase. In full-cell experiments, the cell with a sintered LiCoO2 cathode with industrial-level current density (3.5 mA cm−2) has a volumetric capacity (723 mAh cm−3) 21% higher than that of a conventional cathode (597 mAh cm−3). The cathode coated with the conductive agent shows a 30% higher cycle life after testing for 500 cycles compared to the bare cathode. High-density sintered cathodes are fabricated with an industrially acceptable cycle lifetime of 84% capacity retention over 500 cycles at 1 C.

中文翻译：

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高密度三维烧结 LiCoO2 板阴极的稳定循环


仅由活性材料组成的高密度烧结板式阴极可以实现超越当前技术水平的锂离子电池 （LIB） 的高能量密度。然而，固态阴极板中锂离子的缓慢移动和烧结阴极晶界在许多充电/放电循环中的劣化是商业化的障碍。在此，我们提出了一种新的三维高密度烧结 LiCoO2 板阴极，具有周期性对准通道，可实现高能量密度 LIB 的快速充电/放电。此外，我们研究了晶界开裂机制，并在 LiCoO2 阴极中引入了导电涂层剂，以防止裂纹扩展，增强烧结 LiCoO2 晶粒之间的电子转移，并防止形成不需要的阴极电解质界面。在全电池实验中，具有工业级电流密度 （3.5 mA cm-2） 的烧结 LiCoO2 阴极的电池的体积容量 （723 mAh cm-3） 比传统阴极 （597 mAh cm-3） 高 21%。与裸阴极相比，涂有导电剂的阴极在测试 500 次循环后显示出 30% 的循环寿命。高密度烧结阴极的制造具有工业可接受的循环寿命，在 1 C 下超过 500 次循环，容量保持率为 84%。