BiOIO 3 @Zn 3 (PO 4 ) 2 ·4H 2 O Heterojunction with Fast Ionic Diffusion Kinetics for Long-Life "Rocking-Chair" Zinc Ion Batteries

• Published in: ACS applied materials & interfaces 2023-04, Vol.15 (14), p.17757-17766
• Main Authors: Qian, Yuzhu, Li, Xinni, Wang, Hongrui, Song, Ting, Pei, Yong, Liu, Li, Wang, Xianyou, Deng, Qi, Wu, Xiongwei, Long, Bei
• Format: Article
• Language: English
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.2c19518

Increasing insertion host materials are developed as high-performance anodes of "rocking-chair" zinc ion batteries. However, most of them show unsatisfactory rate capabilities. Herein, layered BiOIO is reported as an excellent insertion host and a zinc ion conductor, i.e., Zn (PO ) ·4H O (ZPO), is introduced to construct a BiOIO @ZPO heterojunction with a built-in electric field (BEF). Both ZPO and a BEF obviously enhance Zn transfer and storage, which is proven by theoretical calculations and experimental studies. The conversion-type mechanism of BiOIO is revealed through ex situ characterizations. The optimized electrode exhibits a high reversible capacity of 130 mAh g at 0.1 A g , a low average discharge voltage of 0.58 V, an ultrahigh rate performance with 68 mAh g at 5 A g (52% of capacity at 0.1 A g ), and an ultralong cyclic life of 6000 cycles at 5 A g . Significantly, the BiOIO @ZPO//Mn O full cell shows a good cyclic life of 67 mAh g over 1000 cycles at 0.1 A g . This work provides a new insight into the design of anodes with excellent rate capability.