Journal
ACS MATERIALS LETTERS
Volume 3, Issue 4, Pages 372-378Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmaterialslett.1c00135
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Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [19H02817, 19K05649, 20H00399]
- Japan Association for Chemical Innovation (JACI)
- Advanced Characterization Nanotechnology Platform, Nanotechnology Platform Program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan at the Research Center for Ultra-High Voltage Electron Microscopy at Osaka University [A-20-OS0001, A-19-OS-0001]
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The study found that increasing the degree of single-crystal formation can improve the charge-discharge capacity and initial Coulombic efficiency of lithium storage materials, with the structural integrity of spindle TiO2 particles maintained during charge-discharge reactions. Doping Nb can further enhance the anode performance, suggesting that single-crystalline rutile TiO2 particles have the potential to be low-cost, high-performance lithium storage materials.
We investigated the Li storage properties of spindle single-crystalline rutile TiO2 fine particles synthesized by a large-scale sulfate process. Their anode properties were compared with those of polycrystalline rutile TiO2 particles. An increase in the degree of single-crystal formation improved the charge-discharge capacity and initial Coulombic efficiency. In situ X-ray diffraction and transmission electron microscopic observation demonstrated the structural integrity of the spindle particles during the charge-discharge reactions. These results concluded that the degree is a critical parameter determining the anode performance of rutile TiO2. The anode performance was further enhanced by doping Nb into the spindle TiO2 particles. These findings suggest that single-crystalline rutile TiO2 particles are very promising low-cost and high-performance Li storage materials.
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