Stress-Tolerant Printed Architectures Toward Stable Cycling ofUltrahigh-Loading Ni-Rich Layered Oxide Cathodes for WearableEnergy Storage Devices

Fast-charging and high-energy density wearable energy storage devices working under high mass loading are in urgentdemand for the state-of-the-art devices. However, the slow reaction kinetics and sluggish ion diffusion still impede their authenticcommercialization. Herein, a thick and robust Ni-rich LiNi0.8Co0.1Mn0.1O2(NCM811) layered oxide cathode grid-structuredelectrode is developed using a three-dimensional (3D) direct ink writing (DIW) technique. On the strength of the 3Dinterconnected channels and conductive scaffolds, both the wettability and the Li+ion/electron transfer in the electrode areenhanced, which improves the utilization of active materials during the charging and discharging process. As expected, the 3D-printed (3DP) LiNi0.8Co0.1Mn0.1O2(NCM811) grid-structured electrode delivers a high areal capacity of 7.48 mAh cm-2(similar to 200mAh g-1) even at an ultrahigh mass loading of 36.6 mg cm-2and a low capacity fading of 0.22% per cycle after 100 cycles at 200 mAg-1. A customized cell module composed of the 3DP NCM811 grid-structured thick cathode and the 3DP artificial graphite grid-structured thick anode, coupled with the ultralow-power offline artificial intelligence electronic module, can power smart glasses andrealize augmented-reality time display. The 3D extrusion technique provides a new venue for future smart,flexible, and wearableelectrons.

Automated summary

In this study, a thick and robust Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) layered oxide cathode grid-structured electrode is developed using a three-dimensional (3D) direct ink writing (DIW) technique. This electrode demonstrates high energy density and fast charging for wearable energy storage devices.