Construction of Longitudinal (003) Textured Low-Strain Diffusion Channel in 4.6 V LiCoO2‑Based All-Solid-State Thin Film Battery for Microelectronic Systems

• Published in: ACS energy letters Vol. 10; no. 7; pp. 3249 - 3258
• Main Authors: Qiu, Jinxu, Li, Hongliang, Wu, Tao, He, Yaxuan, Xu, Rongrui, Hua, Yuezhen, Zhao, Yu, Shu, Jie, Xie, Keyu, Cui, Yanhua
• Format: Journal Article
• Language: English
• Published: American Chemical Society 11.07.2025
• ISSN: 2380-8195; 2380-8195
• DOI: 10.1021/acsenergylett.5c01012

The growing trend of unmanned monitoring and the widespread popularity of intelligent automation necessitate higher energy storage for self-powered microbatteries. All-solid-state thin-film lithium batteries offer significant advantages in size and integration but are still subject to their low-voltage plateau (<3.3 V) and microampere-level capacity (≤0.2 mWh). Herein, we proposed the crystal-facet engineering combined with the substrate anchoring effect to address critical structure variation in the 4.6 V LiCoO2 film. The rotated (003) basal plane effectively relieves internal stress and the Li+ migration energy barrier, contributing to strengthened continuous migration channels and a structure skeleton in Nb2O5@LCO nanosheets. Therefore, the additive-free full cell exhibits excellent cyclability, retains 72.5% capacity retention over 500 cycles at 1.4 C between 3.0 and 4.6 V, and has a high energy density of 1.148 mWh cm–2 in a 3.5 cm2 thin-film cell. This study provides a prototype method for tailoring desired compatible thin film electrode materials for further on-chip microdevices.