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Ti 2 O 3 (H 2 PO 4 ) 2 ·2H 2 O as a Novel Intercalated Anode for Ultralong Lifespan “Rocking‐Chair” Aqueous Zinc‐Ion Batteries
Author(s) -
Guo Xinyu,
Li Chang,
Zhou Yi,
Chen Yan,
Deng Wenjun,
Li Rui
Publication year - 2025
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202502446
Subject(s) - anode , aqueous solution , zinc , ion , galvanic anode , materials science , chemical engineering , inorganic chemistry , chemistry , metallurgy , electrode , organic chemistry , engineering , cathodic protection
Abstract The application of aqueous zinc‐ion batteries (AZIBs) with Zn metal anode is hindered by severe dendritic growth, corrosion, and inefficient Zn utilization. “Rocking‐chair” type AZIBs are considered a viable approach toward practical applications due to the success of commercial lithium‐ion batteries employing intercalated graphite anodes. Herein, a new type of layered titanium phosphate Ti 2 O 3 (H 2 PO 4 ) 2 ·2H 2 O is proposed for the first time as the intercalated anodes for AZIBs, exhibiting a capacity of 108 mAh g −1 at 50 mA g −1 , with a low discharge potential of 0.17 V (vs. Zn 2+ /Zn). The ion insertion process is thoroughly investigated, and a micro‐dendrite growth‐corrosion mode is proposed to explain the capacity degradation mechanism. Corresponding countermeasures are designed, resulting in a significant improvement in cycle life. When coupled with a zinc hexacyanoferrate (KZnHCF) cathode, the “rocking‐chair” full battery exhibits an ultralong lifespan of 50000 cycles (111 days) at 2000 mA g −1 with 94% capacity retention. This work presents a novel perspective for the development of practical AZIBs.