Tailored Design Ti4+ Coordination via Coplanar Carboxyl and Hydroxyl Groups Toward High Purity TiO2(B) with Ultrafast Li+ Storage

TiO2(B) is a promising anode material for lithium‐ion batteries (LIBs) due to its fast lithiation/delithiation kinetics, however, its thermodynamic metastable nature makes it difficult to synthesize pure phase, which significantly affects its lithium storage capability. Herein, the structural evolut...

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Bibliographic Details
Published in:Advanced functional materials 2024-06, Vol.34 (23), p.n/a
Main Authors: Ke, Jinlong, Li, Meichen, Chen, Shi, Xiao, Peitao, Hu, Aiping, Xu, Chaohe, Gao, Peng, Liu, Jilei
Format: Article
Language:English
Subjects:
Anodes
Coordination
electrochemical properties
Electrode materials
Glycolic acid
Hydroxyl groups
Lithium-ion batteries
lithium‐ion battery
phase purity
Precursors
Purity
TiO2(B)
Titanium dioxide
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Summary:TiO2(B) is a promising anode material for lithium‐ion batteries (LIBs) due to its fast lithiation/delithiation kinetics, however, its thermodynamic metastable nature makes it difficult to synthesize pure phase, which significantly affects its lithium storage capability. Herein, the structural evolution from precursor to TiO2(B) is systematically investigated and it is revealed that the formation of high‐purity monoclinic HTO (hydrogen titanate) precursor is the key to preparing TiO2(B) with high purity, which can be achieved via tailored‐design the solvent structures of Ti4+ in the precursor solution. Glycolic acid (GA) is favorable for the synthesis of high‐purity HTO, benefiting from its simplest spatial structure and coplanar carboxyl and hydroxyl groups for Ti4+ coordination, further leading to the formation of TiO2(B) with a high phase purity of 98.83% that exhibits excellent rate capability (80.5% capacity retention with current densities increased from 1 to 30 C), thus making it a promising candidate for simultaneous energy and power density LIBs anode. New insights are presented about the mechanism for the formation of high‐purity TiO2(B). The formation of edge‐sharing Ti─O rhombic secondary building units and their zigzag arrangements enabled by the coplanar carboxyl and hydroxyl groups of glycolic acid are important in the formation of desired monoclinic precursors. It is believed that these insights may provide extensive inspiration to the researchers in the synthesis of pure metastable phases with the polymorphism field.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202315218