Wood‐Derived Continuously Oriented Three‐Phase Interfacial Channels for High‐Performance Quasi‐Solid‐State Alkaline Zinc Batteries

• Published in: Advanced materials (Weinheim) 2023-06, Vol.35 (26), p.e2300132-n/a
• Main Authors: Li, Lanze, Cao, Qinghe, Wu, Yitian, Zheng, Yu, Tang, Hongxuan, Ge, Jiujiu, Liang, Mengdi, Zhou, Bao, Jiang, Baiyu, Wu, Sai, Wang, Fan, Pang, Yajun, Shen, Zhehong, Guan, Cao, Chen, Hao
• Format: Article
• Language: English
• Subjects: alkaline zinc batteries; asymmetric wettability; Cathodes; Channels; Mass transfer; Materials science; Metal air batteries; quasi‐solid‐state; three‐phase interfacial channels; wood; Zinc-oxygen batteries
• ISSN: 0935-9648; 1521-4095
• DOI: 10.1002/adma.202300132

Although recently developed hybrid zinc (Zn) batteries integrate the benefits of both alkaline Zn and Zn–air batteries, the kinetics of the electrocatalytic oxygen reaction and mass transfer of the electrolyte, which are limited by the mismatched and disordered multiphase reaction's interfacial transfer channels, considerably inhibit the performance of hybrid Zn batteries. In this work, novel, continuously oriented three‐phase interfacial channels at the cathode derived from the natural structure of pine wood are developed to address these challenges. A pine wood chip is carbonized and asymmetrically loaded with a hydrophilic active material to achieve the creation of a wood‐derived cathode that integrates the active material, current collector, and continuously oriented three‐phase reaction interfacial channels, which allows the reaction dynamics to be accelerated. Consequently, the assembled quasi‐solid‐state hybrid battery performs an extra charge–discharge process beyond that performed by a typical nickel (Ni)–Zn battery, resulting in a wide operating voltage range of 0.6–2.0 V and a superior specific capacity of 656.5 mAh g–1, in addition to an excellent energy density (644.7 Wh kg–1) and good durability. The ≈370% capacity improvement relative to the Ni–Zn battery alone makes the hybrid battery one of the best‐performing alkaline Zn batteries. A wood‐derived cathode with continuously oriented three‐phase interfacial channels is developed for alkaline hybrid zinc batteries without additional gas diffusion layers to achieve a wide operating voltage range, superior specific capacity with a ≈370% improvement over a nickel–zinc battery alone, and an excellent energy density and cycling stability.