Increasing the thickness of electrodes of lithium-ion batteries (LIBs) is an effective method for improving the volumetric energy density by reducing the inactive materials (e.g., current collector and separator) in LIBs. However, the thickening of conventional electrodes results in poor capacity due to inefficient transport of Li ions through the irregular microstructure of the electrode. To solve this problem, herein, a new three-dimensional (3D) LiCoO₂ (LCO) cathode with periodically aligned microchannels is presented to improve the volumetric energy density of LIBs. The sub-millimeter-thick 3D LCO is fabricated successfully by the ceramics process, which includes lamination of LCO/graphite sheets followed by co-sintering. The 3D LCO demonstrates an excellent areal capacity and rate capability at high rates (31 and 12.1 mAh cm⁻² at 0.1 and 1 C, respectively) because of the constant intervals of the microchannels and a low tortuosity value of 1. Moreover, the electrode density of the 3D LCO is similar to that of a conventional LCO, which enables the improvement of the volumetric energy density. A 3D LCO-Li cell achieves a volumetric energy density of up to 1.8 kW h L⁻¹, which is 50% higher than that of a conventional LCO-Li cell.

增加锂离子电池（LIB）的电极厚度是一种有效的方法，可通过减少LIB中的惰性材料（例如集电器和隔板）来提高体积能量密度。然而，由于锂离子通过电极的不规则微结构的无效传输，常规电极的增厚导致容量差。为了解决这个问题，本文中，新的三维（3D）LiCoO ₂提出了具有周期性排列的微通道的（LCO）阴极，以提高LIB的体积能密度。通过陶瓷工艺成功制造了亚毫米厚的3D LCO，该工艺包括层压LCO /石墨片，然后进行烧结。由于微通道的间隔恒定且曲折度值为1，因此3D LCO在高倍率下（分别在0.1和1 C时分别为31和12.1 mAh cm ^-2）表现出出色的面容量和倍率能力。3D LCO的密度与常规LCO的密度相似，从而可以提高体积能量密度。3D LCO-Li电池可实现高达1.8 kW h L ^-1的体积能量密度，这比常规LCO-Li电池的体积能量密度高50％。